3C-a01

Y 系バルク・MgB2 バルク (2)䝞䝹䜽☢▼䛾㧗ศゎ⬟ 㻺㻹㻾 ほ㻌㻹㼑㼍㼟㼡㼞㼑㼙㼑㼚㼠㻌㼛㼒㻌㼔㼕㼓㼔㻌㼞㼑㼟㼛㼘㼡㼠㼕㼛㼚㻌㻺㻹㻾㻌㼡㼟㼕㼚㼓㻌㻿㼡㼜㼑㼞㼏㼛㼚㼐㼡㼏㼠㼕㼚㼓㻌㻮㼡㼘㼗㻌㻹㼍㼓㼚㼑㼠㻌௰ᮧ㻌 㧘ᚿ䠄⌮◊䠅䠗ෆᾏ༤᫂㸦-(2/5(621$1&(㸧䠗ᰗ㝧௓ఀ⸨ెᏕ㸦࢖࣒ࣛᮦ◊㸧䠗ෆ⸨ᬛஅ⸨௦༤அ㸦ᒾᡭ኱㸧㻺㻭㻷㻭㻹㼁㻾㻭㻌㼀㼍㼗㼍㼟㼔㼕㻌㻔㻾㻵㻷㻱㻺㻕㻧㻌㼁㼀㻿㼁㻹㻵㻌㻴㼕㼞㼛㼍㼗㼕㻌㻔-(2/5(621$1&(㻕㻧㻌㼅㻭㻺㻭㻳㻵㻌㼅㼛㼡㼟㼡㼗㼑㻘㻌㻵㼀㻻㻴㻌㼅㼛㼟㼔㼕㼠㼍㼗㼍㻌㻔㻵㻹㻾㻭㻕㻧㻌 㻌㻺㻭㻵㼀㻻㻌㼀㼛㼙㼛㼥㼡㼗㼕㻘㻌㻲㼁㻶㻵㻿㻴㻵㻾㻻㻌㻴㼕㼞㼛㼥㼡㼗㼕㻌㻔㻵㼣㼍㼠㼑㻌㼁㼚㼕㼢㻚㻕㻌㻱㻙㼙㼍㼕㼘㻦㻌㼠㼍㼗㼍㼟㼔㼕㻚㼚㼍㼗㼍㼙㼡㼞㼍㻬㼞㼕㼗㼑㼚㻚㼖㼜㻌㻝䠊䛿䛨䜑䛻㻌㧗 ㉸㟁ᑟ䝞䝹䜽䠄㻱㼡㻙㻮㼍㻙㻯㼡㻙㻻䠅䜢⏝䛔䛯እᚄ 㻢㻠㻌 㼙㼙㻘ෆᚄ 㻟㻞㻌㼙㼙㻘㻌 㧗䛥 㻞㻢㻌㼙㼙 䛾ୖୗ➃䛻䚸୰ᚰ㒊䛜እᚄ 㻢㻠㻌㼙㼙㻘㻌ෆᚄ 㻠㻜㻌㼙㼙㻘㻌 㧗䛥 㻤㻞㻌㼙㼙 䛾୰ᚰ㒊䜢ᣢ䛴䝞䝹䜽ᮦ䜢‽ഛ䛧䚸䛭䛾ෆᚄ㒊ศ䛻እᚄ 26.5 mm ࡢ㖡࣎ࣅࣥ࡟ Gd-Ba-Cu-O ࢸ࣮ࣉࢆ 4 ᒙᕳ࠸ࡓ෇⟄ࢆ㓄⨨ࡋ࡚ࠊࡑࢀࢆ☢▼ᵓᡂ࡜ࡋࡓࠋࡇࡢ㧗 ㉸㟁ᑟయࢆ NMR ⏝࣡࢖ࢻ࣎࢔㉸㟁ᑟ☢▼࡛
4.75 T(Ỉ⣲ཎᏊࡢ᰾☢Ẽඹ㬆࿘Ἴᩘ 202 MHz)࡟☢ሙ୰෭
༷ἲ㸦Field Cooling㸧࡛╔☢ࡋࡓࠋࡇࡢࣂࣝࢡ☢▼࡛ࠊᕷ㈍ࡢ NMR ⿦⨨࡟௜ᒓࡋ࡚࠸ࡿヨᩱᅇ㌿࡜࢔ࢡࢸ࢕ࣈࢩ
࣒ࢆ⤌ࡳྜࢃࡏࡿࡇ࡜࡛ࠊ㧗ศゎ⬟ NMR ࡟ᚲせ࡞ࣆ࣮ࢡ್༙ᖜ࡛ศゎ⬟ 0.5 Hz ࡢࢫ࣌ࢡࢺࣝほ ࡟ᡂຌࡋࡓࠋ
㻞䠊㻺㻹㻾 ⏝䝞䝹䜽☢▼䛾タィ䚸〇స㻌㉸㟁ᑟ䜢⏝䛔䜛䛣䛸䛷ᕷ㈍䛥䜜䛶䛔䜛ᶵჾ䛿䚸⌧᫬Ⅼ䛷䜒㻺㻹㻾 䛸 㻹㻾㻵 䛷䛒䜛䚹㻺㻹㻾 䛸 㻹㻾㻵 䛿䚸ᆒ୍䛛䛴Ᏻᐃ䛷ᙉ䛔☢
ሙ䜢ᚲせ䛸䛩䜛䛯䜑䚸Ọஂ㟁ὶ䝰䞊䝗䛷✌ാ䛷䛝䜛㉸㟁ᑟ䝁䜲䝹䜢ᚲせ䛸䛧䛯䚹㻺㻹㻾 ☢▼䛾㛤Ⓨ䛿䚸䛔䜎㌿᥮ᮇ䛻䛒䜛䛸⾜䛳䛶Ⰻ䛔䚸䛣䜜䛿௒䜎䛷㛤Ⓨ䛾୰ᚰ䛻䛒䛳䛯㔠ᒓ㉸㟁ᑟ⥺ᮦ䠄㻺㼎㼀㼕㻘㻌 㻺㼎㻟㻿㼚䠅䛜⮫⏺☢ሙ䛻䜘䜛㝈⏺䛻㐩䛧䚸䛭䜜௨ୖ䛾ᙉ☢ሙ䜈䛿㧗 ㉸㟁ᑟ䜢⏝䛔䜛䛧䛛᪉ἲ䛿䛺䛟䚸᭱㏆䛭䛾ྍ⬟ᛶ䛜♧䛥䜜䛯㼇㻝㼉䛛䜙䛷䛒䜛䚹୍᪉䚸ୡ⏺ⓗ䛺䝦䝸䜴䝮䛾㟂せ䛾ቑ኱䛻䜘䜛౪⤥୙㊊䛸್ẁ䛾㧗㦐䛜ၥ㢟䛻䛺䛳䛶䛚䜚䚸Ọஂ☢▼ᆺ䛾 㻺㻹㻾 ⿦⨨䛻䜒ὀ┠䛜㞟䜎䛳䛶䛔䜛㼇㻞㼉䚹㻌ᡃ䚻䛿䚸㧗 ㉸㟁ᑟ䝞䝹䜽య䜢⏝䛔䛯☢▼䛷ศᯒ⿦⨨䛸䛧䛶฼⏝ྍ⬟䛺 㻺㻹㻾 ほ 䛷䛝䜛☢▼㛤Ⓨ䛻ྲྀ䜚⤌䜣䛷䛚䜚䚸୰ᚰ㒊䛾ෆᚄ䜢ᣑ኱䛩䜛᪉ἲ䛸䚸ෆᚄ㒊ศ䛻㉸㟁ᑟⷧ⭷䛻䜘䜛෇⟄䜢㓄⨨䛩䜛䛣䛸䛷☢ሙᆒ୍ᛶ䛜㧗䜑䜙䜜䜛䛣䛸㼇㻟㼉䜢ぢ䛔䛰䛧䚸๓㏙䛾☢▼䜢〇స䛧䛯䚹㻌㻔㻢㻜㻌㻹㻴㼦㻕䛾⿦⨨䜢㈍኎䛧䛶䛔䛯ᙜ᫬䠄㻝㻥㻣㻜 ᖺ௦䠅䛾䝇䝨䜽䝖䝹䜢ẚ㍑䛧䛯䜒䛾䛷䛒䜛䚹䝇䝢䞁䜹䝑䝥䝸䞁䜾䛾ศゎ⬟䛿ྠ➼䛷䚸໬Ꮫ䝅䝣䝖䛾ศ㞳⬟䛿䚸☢ሙ䛜 㻟 ಸ௨ୖᙉ䛔䛾䛷䚸኱ኚⰋዲ䛷䛒䜚䚸⌧ᅾ୺ὶ䛸䛺䛳䛶䛔䜛 㻠㻜㻜㻌㻹㻴㼦 䛾䝇䝨䜽䝖䝹䛻㏆䛔ရ㉁䛾䝇䝨䜽䝖䝹䛜ほ 䛥䜜䛶䛚䜚䚸䝞䝹䜽☢▼䛷㧗ศゎ⬟㻺㻹㻾 䛾ほ 䛻ᡂຌ䛧䛯䚹㻌㻌㻢䠊䜎䛸䜑㻌⌧ᅾタ⨨䛥䜜䛶䛔䜛 㻺㻹㻾 ⏝䛾㉸㟁ᑟ☢▼䛸䛿ẚ㍑䛻䛺䜙
䛺䛔䛟䜙䛔ᑠ䛥䛺䝞䝹䜽☢▼䛷㧗ศゎ⬟ 㻺㻹㻾 䛾ほ 䛻ᡂຌ䛧䛯䚹䛯䛰䛧䚸⌧ᅾ䛿ศᯒᶵჾ䛸䛧䛶୺ὶ䛸䛺䛳䛶䛔䜛 㻺㻹㻾 ⏝䛾㉸㟁ᑟ☢▼䛿๓㡯䛻䜒䛒䛢䛯 㻠㻜㻜㻌㻹㻴㼦㻔㻥㻚㻠㻌㼀㻕䛷䛒䜛䚹໬Ꮫ䝅䝣䝖䛾ศ㞳⬟䜒䚸䛥䜙䛻 㻞 ಸᘬ䛝ୖ䛢䛽䜀䚸ྠ䛨ᛶ⬟䛸䛺䜙䛺䛔䚹䛧䛯䛜䛳䛶䚸☢ሙᆒ୍ᛶ䛺䛹䛾ရ㉁䛿䛣䛾䜎䜎䛷䚸☢ሙᙉᗘ䛒䛢䛶䛔䛟䛣䛸䛜䚸௒ᚋ䛾ㄢ㢟䛷䛒䜛䚸᫖ᖺ䛾ᅜ㝿఍㆟䛷䜒♧䛧䛯㼇㻡㼉䜘䛖䛻䚸䝞䝹䜽☢▼䛾ᙉ☢ሙ໬䛻䛿㟁☢ᛂຊ䛻⪏䛘䜛ᶵᲔᙉᗘ䛾⿵ᙉ䛜ᚲせ䛸䛺䜛䚹㻌䝞䝹䜽☢▼䛾 㻺㻹㻾 䛿䚸᪤Ꮡ䛾ᴫᛕ䛸䛿඲䛟㐪䛳䛯౯್䜢ᣢ䛳䛶䛚䜚䚸᪂䛧䛔 㻺㻹㻾 䛾ᢏ⾡䛜䛣䜜䛛䜙ᥦ᱌䛥䜜䛶䛟䜛䛣䛸䜢䚸኱䛔䛻ᮇᚅ䛧䛶䛔䜛䚹㻌㻌ㅰ㎡㻌
ᮏ◊✲ࡣᅜ❧◊✲㛤Ⓨἲே᪥ᮏ་⒪◊✲㛤Ⓨᶵ ᵓ(AMED)ࡢඛ➃ィ ศᯒᢏ⾡࣭ᶵჾ㛤Ⓨࣉࣟࢢ࣒ࣛ࡟ᨭ᥼
ࡉࢀࡓࡶࡢ࡛࠶ࡾࠊ῝ࡃㅰពࢆ⾲ࡍࡿࠋ
㻌

D 

㻌

㻟䠊㧗ศゎ⬟ 㻺㻹㻾 ほ 䛾䛯䜑䛾⿦⨨㻌ศᯒ⏝䛾 㻺㻹㻾 䛷䛿䚸㟼☢ሙ✵㛫䛻ヨᩱ⟶䛜ධ䜛䛰䛡䛷䜒
ヨᩱ䛸䜺䝷䝇⟶䛻䜘䛳䛶䛷䛝䜛✵Ẽ䛸䛾☢໬⋡䛾ᕪ䛷䚸☢ሙ✵㛫䛾ᆒ୍ᛶ䛾෌ㄪᩚ䛜ᚲ㡲䛸䛺䜛䚹䛣䛾䛯䜑ヨᩱ✵㛫䛾☢
ሙศᕸ䜢ྍኚ䛷䛝䜛෇⟄䛻ᕳ䛛䜜䛯䝁䜲䝹䠄䝅䝮䝁䜲䝹䠅䛜⿦ഛ䛥䜜䛶䛔䜛䚹ᡃ䚻䛿䛭䛾ᐊ ࢩ࣒ࢥ࢖ࣝ㸦Z1, Z2, X, Y, ZX,
ZY, XY, X2-Y2㸧࡜ࠊ☢▼ࡢ୰ᚰ㍈࡛ヨᩱᅇ㌿ࡋࠊᚄ᪉ྥ
ࡢ☢ሙศᕸࢆ᫬㛫ᖹᆒࡍࡿ⿦⨨ࠊࡑࡋ࡚᫬㛫ⓗ࡞☢ሙኚືࢆᢚ࠼ࡿ☢ሙࣟࢵࢡ࡜࠸࠺ᕷ㈍ࡢ㧗ศゎ⬟ NMR ⿦⨨࡟௜ᒓࡋ࡚࠸ࡿࡍ࡭࡚ࡢ⿦⨨ࢆ㛤Ⓨࡋࡓ[4]ࠋ㻌㻠䠊ᐇ㦂㻌ヨᩱ䛿䚸䝅䝀䝭䛾 㻡㻌㼙㼙 䝬䜲䜽䝻䝪䝖䝮䝏䝳䞊䝤䛾䝪䝖䝮ᚄ 㻠㻌㼙㼙 䛾ヨᩱ⟶䛻䚸㔜⁐፹䜰䝉䝖䞁䛻䜽䝻䝖䞁㓟䜶䝏䝹䜢⁐ゎ䛥䛫䛯䜒䛾‽ഛ䛧䛯䚹䛣䛾ヨᩱ䛿Ọஂ☢▼ᆺ䛾⿦⨨䛷ศゎ⬟䛾ᛶ⬟䜢♧䛩ヨᩱ䛸䛧䛶⏝䛔䜙䜜䛶䛔䜛䚹 ᐃ䛿䚸㧗ศゎ⬟㻺㻹㻾 ほ 䛷䛿୍␒⡆༢䛺䝅䞁䜾䝹䝟䝹䝇ἲ䛷 㻠 ᅇ✚⟬䛧䛯䝇䝨䜽䝖䝹䜢ྲྀᚓ䛧䛯䚹㻌㻌㻡䠊⪃ᐹ㻌㻲㼕㼓㻚㻝 䛿䚸௒ᅇ㛤Ⓨ䛧䛯䝞䝹䜽☢▼䛻 㻺㻹㻾 ヨᩱ⟶䜢䝉䝑䝖䛩䜛ಠ▔䛾෗┿䛸䚸㼍㻕䝞䝹䜽☢▼㻔㻞㻜㻞㻌 㻹㻴㼦㻕䛷ྲྀᚓ䛧䛯䜽䝻䝖䞁㓟䜶䝏䝹䛾 㻝㻴㻌㻺㻹㻾 䝇䝨䜽䝖䝹䛸 㼎㻕᪥ᮏ㟁Ꮚ䛜Ọஂ☢▼ᆺE 㻌㻲㼕㼓㻚㻝/HIWVLGH3KRWRRI%XON0DJQHW LQFOXGH576KLPGHYLFH DQG 6DPSOH VSLQQLQJ 6\VWHP  5LJKW VLGH&RPSDULVRQRI(WK\O&URWRQDWH+1056SHFWUDRID D%XON0DJQHW 0+] DQGE D3HUPDQHQW0DJQHW 
0+] 
㻌

ཧ⪃ᩥ⊩㻌
1.

K. Hashi, et al.: J. Magn. Reson. 256 (2015) 30-33.

2.

J.C. Edwards.:Magn Reson Chem, 54 (2016) 6, p. 492-3.

3.

H. Fujishiro, et al.: Superconductor Science & Technology, 28 (2015) 9.

4.

T. Nakamura, et al.: J. Magn. Reson. 259 (2015) 68-75.

5.

T. Nakamura, et al.: Abstracts of CSSJ 50th Anniversary― 170 ―

Conference, (2016) p.262

第95回

2017年度秋季低温工学・超電導学会

3C-a02

Y 系バルク・MgB2 バルク (2)䝸䞁䜾≧㻽㻹㻳㻌 㼹䝞䝹䜽䝬䜾䝛䝑䝖䛾䜽䜶䞁䝏⌧㇟㻌㻽㼡㼑㼚㼏㼔㻌 㼜㼔㼑㼚㼛㼙㼑㼚㼍㻌 㼛㼒㻌 㼞㼕㼚㼓㻌 㼟㼔㼍㼜㼑㻌 㻽㻹㻳㻌 㼎㼡㼘㼗㻌 㼙㼍㼓㼚㼑㼠㼟㻌 㻌᳃⏣㻌 ඘䠈ᡭᔱ㻌 ⱥ୍䠈ᡂᮌ㻌 ⤀ஓ䠄᪂᪥㚩ఫ㔠䠅㻌㻹㻻㻾㻵㼀㻭㻌 㻹㼕㼠㼟㼡㼞㼡㻘㻌 㼀㻱㻿㻴㻵㻹㻭㻌 㻴㼕㼐㼑㼗㼍㼦㼡㻘㻌 㻺㻭㻾㻵㻷㻵㻌 㻿㼔㼕㼚㼥㼍䠄㻺㻿㻿㻹㻯䠅㻌㻱㻙㼙㼍㼕㼘㻦㼙㼛㼞㼕㼠㼍㻚㼐㻥㻤㻚㼙㼕㼠㼟㼡㼞㼡㻬㼖㼜㻚㼚㼟㼟㼙㼏㻚㼏㼛㼙

Ts - Tch / K



5.0
4.0
3.0
2.0
1.0
0.0
-1.0
-2.0
-3.0

Thermometer onsample surface

QMG ring
Hall element

Quench㽢

Metal ring䕿㽢

7T mag.

Thermometerin cold head
(For temperature control)

6T mag.

cold head

5T mag.
Heating rate: 1K/min

45

50

55

60

65

70

Tch /K㻲㼕㼓㻚㻌 㻝㻌 㼀㼑㼙㼜㼑㼞㼍㼠㼡㼞㼑㻌 㼐㼕㼒㼒㼑㼞㼑㼚㼏㼑㻌 㼎㼑㼠㼣㼑㼑㼚㻌 㼟㼍㼙㼜㼘㼑㻌 㼟㼡㼞㼒㼍㼏㼑㻌 㼍㼚㼐㻌㼏㼛㼘㼐㻌 㼔㼑㼍㼐㻌 㼐㼡㼞㼕㼚㼓㻌 㼔㼑㼍㼠㼕㼚㼓㻌 㼜㼞㼛㼏㼑㼟㼟㻌 㼍㼒㼠㼑㼞㻌 㼠㼔㼑㻌 㼙㼍㼓㼚㼑㼠㼕㼦㼍㼠㼕㼛㼚㻚㻌

Trapped flux density / T䠍䠊䛿䛨䜑䛻㻌
ඃ䜜䛯≉ᛶ䜢᭷䛩䜛㻽㻹㻳㼹䠄༢⤖ᬗ≧䛾㻝㻞㻟┦୰䛻㻞㻝㻝┦䛜ᚤ⣽ศᩓ䛧䛯䝞䝹䜽≧㓟໬≀㉸㟁ᑟᮦᩱ䠅䛿䠈㻝㻥㻤㻤ᖺ䛻Ⓨ᫂䛥䜜䛯㼇㻝㻙㻠㼉䚹䛭䛾ᚋ䠈ᕼᅵ㢮ඖ⣲䠄㻾㻱䠅䜢⨨᥮䛧䛯✀⤖ᬗ䜢౑⏝䛩䜛༢⤖ᬗ⫱ᡂᢏ⾡䛻䜘䜚኱ᆺ䛾㻽㻹㻳䛜〇㐀ྍ⬟䛸䛺䜚✀䚻䛾ᛂ⏝㛤Ⓨ䛜㐍䜑䜙䜜䛯㼇㻡㻙㻢㼉䚹䝞䝹䜽䝬䜾䝛䝑䝖ᛂ⏝䛿䠈㻝㻥㻤㻥ᖺ䛻ᥦ᱌䛥䜜㻾㻱⨨᥮✀⤖ᬗᢏ⾡䛻䜘䜚䛭䛾ᇶᮏᙧ䛜᏶ᡂ䛧䛯㼇㻣㻘㻤㼉䚹᭱㏆䛷䛿䠈≉䛻ప 䞉ᙉ☢ሙ䛷䛾╔☢䛻䜘䜚ᩘ㼀䛾☢ሙ䛜ᤕᤊྍ⬟䛸䛺䜚䠈ྛ✀䛾䝞䝹䜽䝬䜾䝛䝑䝖ᛂ⏝౛䛜ሗ࿌䛥䜜䛶䛔䜛䚹㻌
᭱㏆䛾㐍ᒎ䛸䛧䛶䠈᪂䛧䛔⿵ᙉ᪉ἲ䛾㛤Ⓨ䛻䜘䜚๭䜜䜢ᢚไ䛧䠈┤ᚄ㻢㻜㼙㼙䛾኱ᆺ㻽㻹㻳䝸䞁䜾䜢⏝䛔䛯㻝㻜㼀╔☢䛾ᡂຌ䛜ᣲ䛢䜙䜜䜛㼇㻥㻘㻝㻜㼉䚹௒ᅇ䠈ᶵᲔⓗᛂຊ䛻䜘䜛๭䜜䛾௚䛻⇕䞉☢Ẽⓗ䛺୙Ᏻᐃᛶ䛻䜘䜛䜽䜶䞁䝏䛷๭䜜䛜Ⓨ⏕䛩䜛ሙྜ䛜䛒䜛䛣䛸䛜ศ䛛䛳䛯䚹䛣䛾䜘䛖䛺䜽䜶䞁䝏⌧㇟䛾ᶵᵓ䛸ᑐ⟇䛻㛵䛧᳨ウ䛧䛯䛾䛷ሗ࿌䛩䜛䚹㸰ᐇ㦂᪉ἲ
㻞㻙㻝㻌 ヨᩱ‽ഛ䠖እᚄ㻢㻜㼙㼙䠈ෆᚄ㻟㻢㼙㼙䠈ཌ䛥㻞㻜㼙㼙䛾㻳㼐⣔㻭㼓㻝㻜㼣㼠㻑䛾㻽㻹㻳䛻⫗ཌ㻝㻜䡉䡉䛾䝇䝔䞁䝺䝇䝸䞁䜾䜢䛿䜑㎸䜏⿵ᙉ䛧䛯䚹㻽㻹㻳䛸䝇䝔䞁䝺䝇䝸䞁䜾䛾䜟䛪䛛䛺㝽㛫䛻䛿┿✵䜾䝸䞊䝇䜢඘ሸ䛧䛯䚹ヨᩱ䛿㻲㼕㼓㻚㻝ෆ䛾ᅗ䛻♧䛧䛯䜘䛖䛻䝁䞊䝹䝗䝦䝑䝗䛻䜾䝸䞊䝇䛷ᅛᐃ䛧ྛ䝉䞁䝃䞊䜢㓄⨨䛧䛯䚹䜎䛯䠈ヨᩱ䛿䠤䡁䜺䝇୰䛷෭༷䛧䛯䚹㻌㻞㻙㻞㻌 ╔☢᪉ἲ䠖㻌 㻝㻜㻜㻷䛷እ㒊☢ሙ䜢༳ຍ䛧㻞㻜㻷䛻෭༷䛧䛯ᚋ䠈㻜㻚㻜㻡㼀㻛ศ䛷ῶ☢䛧╔☢䛧䛯䚹䜎䛯䠈╔☢ᚋ䠈䝁䞊䝹䝗䝦䝑䝗䛾 ᗘ䛚䜘䜃ヨᩱୖ⾲㠃䛾 ᗘ䠈ᤕᤊ☢᮰ᐦᗘ䠈䜂䛪䜏㔞䛾್䜢グ㘓䛧䛯䚹㻌㸱㸬ᐇ㦂⤖ᯝ࣭⪃ᐹ㻞㻜䠧䛻䛚䛔䛶㻡䠰䠈㻢䠰䠈㻣䠰䛾ྛእ㒊☢ሙ୰䛷╔☢ᚋ䠈㻝䠧㻛ศ䛾㏿ᗘ䛷᪼ 䛧䛯᫬䛾ヨᩱୖ⾲㠃 ᗘ䠄㼀 䡏 䠅䛛䜙䝁䞊䝹䝗䝦䝑䝗䛾 ᗘ䠄㼀䠿䡄䠅䜢ᕪ䛧ᘬ䛔䛯 ᗘᕪ䜢㻲㼕㼓㻚㻝䛻♧䛩䚹㻡䠰╔☢䛷䛿⣙㻢㻟䠧䛻䠈㻢䠰╔☢䛷䛿⣙㻡㻥䠧䛻䝢䞊䜽䜢᭷䛧䠈䛥䜙䛻㻣䠰╔☢䛷䛿䠈䜽䜶䞁䝏䛻క䛖ᛴ⃭䛺ቑ኱䛜ぢ䜙䜜䛯䚹㻌㻲㼕㼓㻚㻞䛻㻘䛣䛾䛸䛝䛾ᤕᤊ☢᮰ᐦᗘ䛾ኚ໬䜢♧䛩䚹㻣䠰╔☢᫬䛾䜽䜶䞁䝏䛻క䛖ᛴ⃭䛺ᤕᤊ☢ሙ䛾ῶᑡ䛜ぢ䜙䜜䜛䚹䜎䛯㻘ᗘᕪ䛾䝢䞊䜽䛚䜘䜃䜽䜶䞁䝏䛿䠈䝣䝹╔☢≧ែ䛷䛺䛔≧ែ䛛䜙Ⅼ⥺䛷♧䛩䝣䝹╔☢≧ែ䛻䛺䜛䝍䜲䝭䞁䜾䛷Ⓨ⏕䛧䛶䛔䜛䛣䛸䛜ศ䛛䜛䚹䛣䛾䛣䛸䛛䜙䠈䝣䝹╔☢≧ែ䛻ኚ໬䛩䜛᫬䛻ヨᩱ୰䜢⛣ື䛩䜛☢᮰䛾㔞䛜ᛴ⃭䛻ቑຍ䛧㻘ヨᩱ䛾Ⓨ⇕㔞䛻ᑐ䛧㻘ᗘไᚚ䛜ᑐᛂ䛷䛝䛺䛟䛺䜛䛯䜑 ᗘᕪ䛜ቑ䛧㻘䛥䜙䛻䛿ヨᩱ䛾䠦䠿పୗ㻘☢᮰⛣ື㔞ቑຍ㻘Ⓨ⇕㻘 ᗘୖ᪼䛾䝃䜲䜽䝹䛜▐᫬䛻㉳䛝䜽䜶䞁䝏䛻⮳䜛䜒䛾䛸⪃䛘䜙䜜䜛䚹㻌䛣䛾䜘䛖䛺ᶵᵓ䛻䜘䜚Ⓨ⏕䛩䜛䜽䜶䞁䝏䜢ᢚไ䛩䜛᪉ἲ䛻䛿㻘☢᮰䛾⛣ື䛻䜘䜛Ⓨ⇕㔞䛾ᢚไ㻘ヨᩱ䛾ᢤ⇕䛾ຠ⋡໬➼䛜ᣲ䛢䜙䜜㻘ᐇ㝿䛻᪼ ㏿ᗘ䜢㻜㻚㻡䠧㻛ศ䛻䛩䜛䛣䛸䛻䜘䛳䛶㻣䠰╔☢
䛻䛚䛔䛶䜽䜶䞁䝏䜢㜵䛠䛣䛸䛜䛷䛝㻘䜎䛯㻘↓㓟⣲㖡〇䛾⿵ᙉ䝸䞁䜾➼䛻䜘䜛෭༷ຠ⋡䛾ᨵၿ䛻䜘䛳䛶䜒㻥䠰╔☢ᚋ䛾᪼ 䛷䜽䜶䞁䝏䛿Ⓨ⏕䛧䛺䛛䛳䛯䚹㻌䛣䜜䜙䛾䛣䛸䛛䜙㻘╔☢ᚋ䛾᪼ ᮲௳䛻㛵䛧䛶䛿㻘╔☢᮲௳㻘
ヨᩱ䛾෭༷䞉 ᗘไᚚ᪉ἲ䛻ᑐᛂ䛧䛶㻘༑ศὀពᡶ䛔䜽䜶䞁
䝏䛜Ⓨ⏕䛧䛺䛔᮲௳䛷᪼ 䛩䜛ᚲせ䛜䛒䜛䛣䛸䛜ศ䛛䛳䛯䚹㻌

7T mag.

6.0

5T mag.

4.0

6T mag.
Quench

2.0

Heating rate: 1K/min

0.0

45

50

55

60

Tch /K

65

70㻲㼕㼓㻚㻌 㻞㻌 㻯㼔㼍㼚㼓㼑㻌 㼛㼒㻌 㼠㼞㼍㼜㼜㼑㼐㻌 㼒㼘㼡㼤㻌 㼐㼑㼚㼟㼕㼠㼥㻌 㼐㼡㼞㼕㼚㼓㻌 㼔㼑㼍㼠㼕㼚㼓㻌㻌 㼜㼞㼛㼏㼑㼟㼟㻌 㼍㼒㼠㼑㼞㻌 㼠㼔㼑㻌 㼙㼍㼓㼚㼑㼠㼕㼦㼍㼠㼕㼛㼚㻚㻌㻌ཧ⪃ᩥ⊩㻌㻝㻚㻌 ᳃⏣඘㻘㻌 ᯇ⏣᫛୍䠖㻺㼑㼣㻌 㻿㼡㼜㼑㼞㼏㼛㼚㼐㼡㼏㼠㼕㼚㼓㻌 㻹㼍㼠㼑㼞㼕㼍㼘㼟㻌㻲㼛㼞㼡㼙㻌 㻺㼑㼣㼟㻘㻌 㻺㼛㻝㻜㻌 㻔㻝㻥㻤㻤㻕㻌 㻝㻡㻌㻞㻚㻌 㻹㻚㻌 㻹㼛㼞㼕㼠㼍㻘㻌 㼑㼠㻌 㼍㼘㻚㻦㻌 㻼㼍㼠㼑㼚㼠㻌 㻺㼛㻚㻌 㼁㻿㻙㻡㻡㻜㻤㻞㻡㻟㻘㻌㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻼㼞㼕㼛㼞㼕㼠㼥㻌 㼐㼍㼠㼑㻦㻌 㻜㻢㻚㻜㻢㻚㻝㻥㻤㻤㻚㻌㻟㻚㻌 㻹㻚㻌 㻹㼛㼞㼕㼠㼍㻘㻌 㼑㼠㻌 㼍㼘㻚㻦㻌 㻼㼔㼥㼟㼕㼏㼍㻌 㻯㻌 㻝㻣㻞㻔㻝㻥㻥㻜㻕㻟㻤㻟㻙㻟㻤㻣㻌㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㼇ཧ⪃ᩥ⊩㻌 㻝㻚䛾ⱥヂ㼉㻌㻠㻚㻌 ᳃⏣㻌 ඘䠖༤ኈㄽᩥ䛂⁐⼥ᡂ㛗ἲ䛻䜘䜛኱ᆺ㓟໬≀㻌㉸ఏᑟయ䛾స〇䛸㧗⮫⏺㟁ὶᐦᗘ໬䛻㛵䛩䜛◊✲䛃㻌໭ᾏ㐨኱ᏛᏛ⾡ᡂᯝ䝁䝺䜽䝅䝵䞁䠄㻴㼁㻿㻭㻯㻼䠅㻌㼔㼠㼠㼜㻦㻛㻛㼑㼜㼞㼕㼚㼠㼟㻚㼘㼕㼎㻚㼔㼛㼗㼡㼐㼍㼕㻚㼍㼏㻚㼖㼜㻛㼟㼠㼍㼠㼕㼟㼠㼕㼏㼟㻛㻌㼟㼠㼍㼠㼟㼘㼕㼟㼠㻚㼜㼔㼜㻫㼟㼠㼍㼠㼡㼞㼘㻩㼒㼙㼍㻟㼟㼑㼞㼝㻡㼛㻞㻟㻣㻥㼠㻌㻡㻚㻌 ᳃⏣㻌 ඘➼䠖≉チⓏ㘓␒ྕ䠖㻞㻡㻡㻢㻠㻜㻝㻌㻢㻚㻌 㻹㻚㻌 㻹㼛㼞㼕㼠㼍㻌 㼑㼠㻌 㼍㼘㻚㻦㻌 㻭㼐㼢㼍㼚㼏㼑㼟㻌 㼕㼚㻌 㻿㼡㼜㼑㼞㼏㼛㼚㼐㼡㼏㼠㼕㼢㼕㼠㼥㻌 䊢㻌㻌 㻔㻝㻥㻥㻝㻕㻣㻟㻟㻌㻣㻚㻌 ᳃⏣㻌 ඘㻦㻌 ≉チⓏ㘓␒ྕ䠖㻞㻜㻡㻡㻡㻝㻝㻌㻤㻚㻌 㻹㻚㻌 㻹㼛㼞㼕㼠㼍㻘㻌 㼑㼠㻌 㼍㼘㻚㻦㻌 㻭㼎㼟㼠㼞㼍㼏㼠㼟㻌 㼛㼒㻌 㻯㻿㻶㻌 㻯㼛㼚㼒㼑㼞㼑㼚㼏㼑㻘㻌 㻌㼂㼛㼘㻚㻌 㻠㻝㻌 㻔㻝㻥㻤㻥㻕㻌 㼜㻚㻝㻠㻌㻥㻚㻌 㻹㻚㻌 㻹㼛㼞㼕㼠㼍㻘㻌 㼑㼠㻌 㼍㼘㻚㻦㻭㼎㼟㼠㼞㼍㼏㼠㼟㻌 㼛㼒㻌 㻵㻯㻹㻯㻙㻯㻿㻿㻶㻌 㻯㼛㼚㼒㼑㼞㼑㼚㼏㼑㻌㻌 㻔㻞㻜㻝㻢㻕㻌 㼜㻚㻝㻜㻤㻌㻝㻜㻚㻌 ᳃⏣㻌 ඘➼䠖᪂᪥㚩ఫ㔠ᢏሗ㻌 ➨㻠㻜㻣ྕ䠄㻞㻜㻝㻣䠅㼜㻟㻢― 171 ―

第95回

2017年度秋季低温工学・超電導学会

3C-a03

Y 系バルク・MgB2 バルク (2)㻮㼍 䛾௙㎸⤌ᡂ䛜␗䛺䜛 㻳㼐㻝㻞㻟 ⁐⼥จᅛ䝞䝹䜽䛾⫱ᡂ䛸㉸ఏᑟ≉ᛶ㻌㻿㼥㼚㼠㼔㼑㼟㼕㼟㻌㼛㼒㻌㻳㼐㻝㻞㻟㻌㼙㼑㼘㼠㻙㼟㼛㼘㼕㼐㼕㼒㼕㼑㼐㻌㼎㼡㼘㼗㼟㻌㼟㼠㼍㼞㼠㼕㼚㼓㻌㼒㼞㼛㼙㻌㼢㼍㼞㼕㼛㼡㼟㻌㻮㼍㻌㼏㼛㼙㼜㼛㼟㼕㼠㼕㼛㼚㼟㻌㼍㼚㼐㻌㼠㼔㼑㼕㼞㻌㼟㼡㼜㼑㼞㼏㼛㼚㼐㼡㼏㼠㼕㼚㼓㻌㼜㼞㼛㼜㼑㼞㼠㼕㼑㼟㻚㻌㻌ᯇ୸㻌 ࿘భ㻘㻌బ⸨㻌 ᕦᮃ㻘㻌⟺ෆ㻌 ඃ㻘㻌ඖᮌ㻌 ㈗๎㻘㻌ୗᒣ㻌 ῟୍㻌㻔㟷Ꮫ኱㻕㻌
MATSUMARU Shusuke, SATO Takumi, YANAI Yu, MOTOKI Takanori, SHIMOYAMA Jun-ichi (Aoyama gakuin Univ.);
E-mail: c5617058@aoyama.jp㻌㻌䛩䜛䛣䛸䛷䚸⤖ᬗᡂ㛗㏿ᗘ䛜ቑ኱䛧኱ᆺ䛾䝞䝹䜽స〇䛜ᐜ᫆㻝䠊䛿䛨䜑䛻㻌
REBa2Cu3Oy (RE123)⁐⼥จᅛ䝞䝹䜽䛿ᾮయ❅⣲ ᗘ 77 K䛻䛺䜛䛣䛸䜢♧၀䛩䜛䚹๓ᅇ䛾ሗ࿌䛷 Ba 㐣๫⤌ᡂ䛛䜙䛾⫱ᡂ䜢㉸䛘䜛㧗䛔⮫⏺ ᗘ Tc 䜢᭷䛧䚸㧗☢ሙୗ䛻䛚䛔䛶䜒㧗䛔 Jc

䛻䜘䜚 Gd/Ba ᅛ⁐䛜ᢚไ䛥䜜䚸c-growth 㡿ᇦ䚸a-growth 㡿ᇦ≉ᛶ䜢♧䛩䛣䛸䛛䜙ᙉຊ㉸ఏᑟ☢▼䛸䛧䛶䛾ᛂ⏝䛜ᮇᚅ䛥䜜䛶䛸䜒䛻㉸ఏᑟ≉ᛶ䛜 x 䛾ቑຍ䛸䛸䜒䛻⣔⤫ⓗ䛻ᨵၿ䛩䜛䛣䛸䜢䛔䜛䚹෇┙≧ RE123 ⁐⼥จᅛ䝞䝹䜽䛾ᤕᤊ☢ሙ䛿┤ᚄ䛜኱䛝ሗ࿌䛧䛯䚹୍᪉䚸Ba Ḟᦆ⤌ᡂ䛛䜙䛾⫱ᡂ䛷䛿䚸Fig. 2 䛻♧䛩䛔䜋䛹ୖ᪼䛩䜛䛣䛸[1]䛜▱䜙䜜䛶䛔䜛䛜䚸኱ᆺ໬䛿⤖ᬗᡂ㛗䛾䝢䞁䝙䞁䜾ຊᐦᗘ Fp 䛜 Ba ⤌ᡂ䛾ῶᑡ䛻క䛔⣔⤫ⓗ䛻పୗ㛗᫬㛫໬䜔✀⤖ᬗ௨እ䛛䜙䛾᰾⏕ᡂ䛺䛹䛾䛯䜑ᐜ᫆䛷䛿䛺䛔䚹䛧䛯䛣䛸䛛䜙䚸Gd/Ba ᅛ⁐㔞䛾ቑ኱䛜♧၀䛥䜜䛯䚹䛣䜜䛻ᑐ䛧

䜎䛯䚸RE123 ⁐⼥จᅛ䝞䝹䜽䛷䛿㉸ఏᑟ≉ᛶ䛜ᮏ㉁ⓗ䛻ຎ໬䛶䛿䚸Fig. 2 䛻䛚䛔䛶ԡ䛷♧䛩䜘䛖䛻䚸Gd/Ba ᅛ⁐㔞䜢పୗ䛥䛩䜛 RE/Ba ᅛ⁐䛜⮬Ⓨⓗ䛻⏕䛨䜛䛯䜑䚸⁐⼥จᅛ๓䛾 BaO2

䛫䜛 1%O2/Ar 㞺ᅖẼ୰䛷䛾㑏ඖ䝫䝇䝖䜰䝙䞊䝹(PA)䛾ᑟධῧຍ[2]䚸㑏ඖ㞺ᅖẼୗ䛷䛾䝞䝹䜽⫱ᡂ䞉䝫䝇䝖䜰䝙䞊䝹[3,4]䚸

䛜᭷ຠ䛷䛒䜛䛣䛸䛜♧䛥䜜䛯䚹RE ΰྜ[5]䛺䛹䛾᪉ἲ䛻䜘䛳䛶 RE/Ba ᅛ⁐䜢ᢚไ䛩䜛䛣䛸䜒㔜せ䛷䛒䜛䚹ᮏ◊✲䛷䛿䚸Gd123 ⁐⼥จᅛ䝞䝹䜽䛾㉸ఏᑟ≉ᛶ䛾ᨵၿ䛸኱ᆺ໬䜢┠ⓗ䛸䛧䚸㏻ᖖ䛾 RE123 ⁐⼥จᅛ䝞䝹䜽඲య䛾⤌ᡂ䛜 RE123-RE211 䝍䜲䝷䜲䞁ୖ䛻䛒䜛䛾䛻ᑐ䛧䚸䛣䜜䜘䜚Ba 䛜Ḟᦆ䜒䛧䛟䛿㐣๫䛸䛺䜛䜘䛖䛺௙㎸⤌ᡂ䛛䜙䛾䝞䝹䜽⤖ᬗ䛾⫱ᡂ䜔㑏ඖ䝫䝇䝖䜰䝙䞊䝹䛻䜘䜛 Gd/Ba ᅛ⁐䛾ᢚไ䜢ヨ䜏䛯䚹㻞䠊ᐇ㦂᪉ἲ

ᙜ᪥䛿䚸Ba ⤌ᡂ䛸᱁Ꮚᐃᩘ䛾㛵ಀ䜔ᚤ⣽⤌⧊䚸⤌ᡂศᯒ䛻䛴䛔䛶䜒ሗ࿌䛩䜛䚹ཧ⪃ᩥ⊩㻌[1] Nariki, et al., Supercond Sci. Technol.29 (2016) 034002.
[2] A. Hu et al., Supercond. Sci. Technol. 17 (2004) 545 - 548.
[3] S.I. Yoo et al., Jpn. J. Appl. Phys. 33 (1994) L1000 - L1003.
[4] T. Akasaka et al., IEEE Trans. Appl. Supercond. 21 (2011)
2706-2709.
[5] Y. Setoyama et al., Supercond. Sci. Technol. 28 (2015)
015014.

๓㥑య⢊ᮎ䛸䛺䜛 Gd123 䛸 Gd211 䛾ΰྜ⢊ᮎ䛿ప ᅛ┦཯ᛂ䛻䜘䜚ྠ᫬ྜᡂ䛧䛯䚹Ba 㔞䛜Ḟᦆ䛛䜙㐣๫䛾⤌ᡂ䛻䛺䜛䜘䛖ฟⓎཎᩱ䜢䝰䝹ẚ䛷 Gd2O3 : BaCO3 : CuO = 1.3 : 3.4 +2x : 4.8 (x = -0.20 – 0.35)䛸䛺䜛䜘䛖⛗㔞䚸ΰྜᚋ䚸↝ᡂ䜢✵Ẽ୰䛷 890°C䠈12 ᫬㛫䛷 2 ᅇ⾜䛔䚸Gd123 䛸 Gd211 䛾䝰䝹ẚ
䛜 7 : 3 䛾ΰྜ⢊ᮎ䜢స〇䛧䛯䚹ᚓ䜙䜜䛯⢊ᮎ䛻 Ag2O㻌 10
wt%, Pt 0.1 wt%䜢 ῧ ຍ 䚸 ΰ ྜ 䛧 䛯 ⢊ ᮎ 䜢୍ ㍈ 䝥 䝺 䝇(100Fig. 1 Top view photographs of Gd123 bulks with x = -0.10(left), x = 0 (center) and x = 0.35 (right).

MPa)䛻䜘䜚 20 mmI × 8 mmt 䛾䝨䝺䝑䝖䛻ᡂᆺ䛧䛯䚹Nd123 ༢⤖ᬗ䜢✀⤖ᬗ䛸䛧䛶䝨䝺䝑䝖䛾ୖ㠃୰ኸ䛻⨨䛝䚸ᗏ㠃ຍ⇕᪉ᘧ䛾㟁Ẽ⅔䜢⏝䛔䛶䚸✵Ẽ୰䛷⁐⼥จᅛ䜢⾜䛔䚸Gd123 ⁐⼥จᅛ䝞䝹䜽䜢ᚓ䛯䚹స〇䛧䛯䝞䝹䜽䜢ᯈ≧䛻ษ䜚ฟ䛧䚸
350°C 䜎䛷㓟⣲䜰䝙䞊䝹䜢༑ศ䛻⾜䛳䛯ᚋ䚸1.5 mm × 1.5
mm × 1 mm//c㻌 䛾ᑠ∦ヨᩱ䛻ษ䜚ฟ䛧䚸㉮ᰝᆺ㟁Ꮚ㢧ᚤ㙾䛻䜘䜚ᚤ⣽⤌⧊䜢ほᐹ䛧䚸SQUID ☢᮰ィ䜢⏝䛔䛯☢໬ᐃ䜘䜚㉸ఏᑟ≉ᛶ䜢䚸⢊ᮎ XRD 䝟䝍䞊䞁䛾ゎᯒ䜘䜚᱁Ꮚᐃᩘ䜢ホ౯䛧䛯䚹㻟䠊⤖ᯝ䛸⪃ᐹBa 㐣๫㔞 x = -0.20 – 0.35 䛾⠊ᅖ䛷䜋䜌䝅䞁䜾䝹䝗䝯䜲䞁䛾
Gd123 ⁐⼥จᅛ䝞䝹䜽䛜ᚓ䜙䜜䛯䚹Fig. 1 䛻 Gd123 ⁐⼥จᅛ䝞䝹䜽䛾ୖ㠃䛾እほ䜢♧䛩䚹Ba 㐣๫⤌ᡂ䛛䜙䛾⫱ᡂ䛷䛿䝞䝹䜽➃䜎䛷⤖ᬗ䛜฿㐩䛧䛻䛟䛟䛺䜛ഴྥ䛜䛒䜚䚸⤖ᬗᡂ㛗㏿ᗘ䛜పୗ䛧䛯䛣䛸䜢ព࿡䛩䜛䚹䛭䛣䛷ᚎ෭᫬㛫䜢ᘏ䜀䛧䛸䛣䜝䚸䝞䝹䜽➃䜎䛷⤖ᬗᡂ㛗䛧䝅䞁䜾䝹䝗䝯䜲䞁䛻䛺䜛䛣䛸䜢☜ㄆ䛧䛯䚹䛣䜜䜙䛾⤖ᯝ䛿䚸㏫䛻 Ba Ḟᦆ䛾௙㎸⤌ᡂ䛛䜙䝞䝹䜽䜢⫱ᡂ

Fig. 2 Magnetic field dependence of Fp (77 K) of Gd123
melt-solidified bulks starting from various Ba
compositions.

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第95回

2017年度秋季低温工学・超電導学会

3C-a04

Y 系バルク・MgB2 バルク (2)㻔㼅㻘㻌㻰㼥㻕㻞㻝㻝 䜢⏝䛔䛯 㼅㻮㼍㻯㼡㻻 ⁐⼥จᅛ䝞䝹䜽䛾㻌㉸ఏᑟ≉ᛶ䛸㓟⣲䜰䝙䞊䝹 ᗘ䛾᭱㐺໬㻌㻿㼡㼜㼑㼞㼏㼛㼚㼐㼡㼏㼠㼕㼢㼑㻌㼏㼔㼍㼞㼍㼏㼠㼑㼞㼕㼟㼠㼕㼏㼟㻌㼍㼚㼐㻌㼛㼜㼠㼕㼙㼕㼦㼍㼠㼕㼛㼚㻌㼛㼒㻌㼛㼤㼥㼓㼑㼚㻌㼍㼚㼚㼑㼍㼘㼕㼚㼓㻌㼠㼑㼙㼜㼑㼞㼍㼠㼡㼞㼑㻌㻌 㼒㼛㼞㻌㼅㻮㼍㻯㼡㻻㻌㼙㼑㼘㼠㻙㼟㼛㼘㼕㼐㼕㼒㼕㼑㼐㻌㼎㼡㼘㼗㼟㻌㼡㼟㼕㼚㼓㻌㻔㼅㻘㻌㻰㼥㻕㻞㻝㻝㻌

Normalized M㻌㧗ᶫ㻌 ຬ▮䠈ෆ⸨㻌 ᬛஅ䠈⸨௦㻌 ༤அ㻌 䠄ᒾᡭ኱Ꮫ䠅㻌㼀㻭㻷㻭㻴㻭㻿㻴㻵㻌㼅㼡㼥㼍㻘㻌㻺㻭㻵㼀㻻㻌㼀㼛㼙㼛㼥㼡㼗㼕㻘㻌㻲㼁㻶㻵㻿㻴㻵㻾㻻㻌㻴㼕㼞㼛㼥㼡㼗㼕㻌㻔㻵㼣㼍㼠㼑㻌㼁㼚㼕㼢㻚㻕㻌 㻌㻱㻙㼙㼍㼕㼘㻦㻌㼠㻞㻞㻝㻢㻜㻝㻥㻬㼕㼣㼍㼠㼑㻙㼡㻚㼍㼏㻚㼖㼜㻌㻌㻝䠊䛿䛨䜑䛻㻌
㻌䛣䜜䜎䛷 㻾㻱㻮㼍㻯㼡㻻 ㉸ఏᑟ䝞䝹䜽䛾⮫⏺㟁ὶᐦᗘ 㻶㼏 ྥୖ䛾䛥䜙䛻䚸㓟⣲䜰䝙䞊䝹 ᗘ䛾᭱㐺໬䜢⾜䛔䛖䛣䛸䛷䚸䜘䜚ཝᐦ䛻㻔㼅㻘㻌 㻰㼥㻕㻮㼍㻯㼡㻻 ㉸ఏᑟ䝞䝹䜽䛻䛚䛡䜛 㻾㻱 ΰྜຠᯝ䜢⪃ᐹ䛯䜑䚸ᵝ䚻䛺ᡭἲ䛜䛺䛥䜜䛶䛔䜛䚹㻾㻱㻮㼍㻯㼡㻻 ㉸ఏᑟ䝞䝹䜽䛻䛧䛶䛔䛟䚹㻌
䛚䛔䛶䚸ప⃰ᗘ䛾 㻾㻱㻛㻮㼍 ᅛ⁐㡿ᇦ䛿☢ሙㄏ㉳ᆺ䛾䝢䞁Ṇ䜑
Ⅼ䛸䛺䜚 㻶㼏 䜢ྥୖ䛥䛫䜛䛣䛸䛜▱䜙䜜䛶䛔䜛㼇㻝㼉䚹᭱㏆䚸ᵝ䚻䛺
0.2
㻾㻱 䜢 㻞 ✀㢮⤌䜏ྜ䜟䛫䛯 㻾㻱 ΰྜ䝞䝹䜽䛻䛚䛔䛶䚸☢᮰䝢䞁
Y211:Dy211Ṇ䜑≉ᛶ䛜ྥୖ䛩䜛䛣䛸䜔 㻾㻱㻛㻮㼍 ᅛ⁐䜢ไᚚ䛷䛝䜛䛣䛸䛜ሗ0࿌䛥䜜䛯㼇㻞㼉䚹䛧䛛䛧䚸㻾㻱 ΰྜຠᯝ䛾䝯䜹䝙䝈䝮䛿༑ศ䛻⌮ゎ
3:0䛥䜜䛶䛔䛺䛔䚹๓ᅇ䛾Ⓨ⾲䛷䚸㼅㻞㻝㻝 䛸 㻰㼥㻞㻝㻝 䜢ᵝ䚻䛺๭ྜ䛷
2:1-0.2
ΰྜ䛧䛯 㼅㻮㼍㻯㼡㻻 ⁐⼥จᅛ䝞䝹䜽ẕ┦୰䛻䛚䛡䜛 㻾㻱 ඖ⣲䛾
1:2
๭ྜ䛜⣔⤫ⓗ䛻ኚ໬䛧䛶䛔䜛䛣䛸䜢ሗ࿌䛧䛯䚹௒ᅇ䚸ᵝ䚻䛺
0:3-0.4
ᗘ䛷㓟⣲䜰䝙䞊䝹䛧䛯㻔㼅㻘㻌㻰㼥㻕㻮㼍㻯㼡㻻 䝞䝹䜽䛾㉸ఏᑟ≉ᛶB//c䛛䜙䚸㻾㻱 ΰྜ䛜☢᮰䝢䞁Ṇ䜑≉ᛶ䛻୚䛘䜛ᙳ㡪䜢᫂䜙䛛䛻-0.6
0.4 mT䛩䜛䛣䛸䜢┠ⓗ䛸䛧䛯䚹㻌㻌
-0.8㻞䠊ᐇ㦂᪉ἲ㻌㼅㻝㻞㻟 ⢊ᮎ䛸 㻾㻱㻞㻝㻝㻔㻾㻱㻌㻩㻌㼅㻘㻌㻰㼥㻕⢊ᮎ䜢䝰䝹ẚ 㻝㻜䠖㻟 䛷ΰྜ-1䛧䚸㻯㼑㻻㻞 䜢 㻾㻱㻞㻝㻝 ᚤ⣽ศᩓ䛾䛯䜑 㻜㻚㻡㻌 㼣㼠㻑ῧຍ䛧䛯䚹㻾㻱㻞㻝㻝
1 mm distance from the seed crystal䛿 㼅㻞㻝㻝䠖㻰㼥㻞㻝㻝㻌 㻩㻌 㻟䠖㻜䚸㻞䠖㻝䚸㻝䠖㻞䚸㻜䠖㻟 䛷ΰྜ䛧䛯䜒䛾䜢⏝䛔
-1.2
88
90
92
䛯䚹㻔௨ୗ䚸స〇䛧䛯䝞䝹䜽䜢㻔㼅㻘㻌 㻰㼥㻕㻮㼍㻯㼡㻻㼇㼅㻞㻝㻝㻦㻰㼥㻞㻝㻝㼉䛸⾲グ䛩䜛䚹㻕䛭䛾ᚋ䚸㻞㻜㻌㼙㼙䃥䛾䝨䝺䝑䝖≧䛻ᅽ⢊ᡂᙧ䛧䛯䚹✀⤖Temperature (K)ᬗ䛻 㻺㼐㻮㼍㻯㼡㻻 䜢⏝䛔䛶⁐⼥จᅛ䜢⾜䛳䛯䚹ᡂ㛗䛧䛯䝞䝹䜽㻲㼕㼓㻚㻝㻌㼀㼑㼙㼜㼑㼞㼍㼠㼡㼞㼑㻌㼐㼑㼜㼑㼚㼐㼑㼚㼏㼑㻌㼛㼒㻌㼚㼛㼞㼙㼍㼘㼕㼦㼑㼐㻌㼙㼍㼓㼚㼑㼠㼕㼦㼍㼠㼕㼛㼚㻌䛾✀ୗ 㻝㻌㼙㼙 䛾㒊ศ䛛䜙⣙ 㻞㻌㼙㼙㽢㻞㻌㼙㼙㽢㻝㻌㼙㼙 䛾ᑠ∦䜢ษ䜚㻌 㼒㼛㼞㻌㼠㼔㼑㻌㻔㼅㻘㻌㻰㼥㻕㻮㼍㻯㼡㻻㼇㼅㻞㻝㻝㻦㻌㻰㼥㻞㻝㻝㼉㻌㼎㼡㼘㼗㼟㻚㻌ฟ䛧䚸㻟㻥㻜䉝㻌 㻙㻌 㻠㻥㻜䉝䛷 㻝㻞㻜㻌 㼔 㓟⣲䜰䝙䞊䝹䛧䛯䚹䛭䛾ᚋ䚸㻿㻽㼁㻵㻰 ☢᮰ィ䛻䜘䛳䛶☢໬䛾 ᗘཬ䜃☢ሙ౫Ꮡᛶ䜢 ᐃ䛧䛯䚹㻿㻱㻹 䛻䜘䜛ᚤ⣽⤌⧊ほᐹ䜢⾜䛳䛯䚹䜎䛯䚸⢏ᚄ ᐃ䝋䝣䝖䛻䜘䜚 㻾㻱㻞㻝㻝 䛾⢏ᚄཬ䜃⢏ᗘศᕸ䜢ぢ✚䜒䛳䛯䚹㻌㻌㻌㻟䠊ᐇ㦂⤖ᯝ㻌㻲㼕㼓㻚㻌㻝 䛻㻔㼅㻘㻌㻰㼥㻕㻮㼍㻯㼡㻻 䝞䝹䜽䛾☢໬䛾 ᗘ౫Ꮡᛶ䜢♧䛩䚹඲䛶䛾䝞䝹䜽䛻䛚䛔䛶䝅䝱䞊䝥䛺㌿⛣䛜☜ㄆ䛷䛝䜛䚹 㻔㼅㻘㻌㻰㼥㻕㻮㼍㻯㼡㻻㼇㻟㻦㻜㼉䛾㌿⛣ ᗘ䛜 㻥㻝㻚㻜㻷 䛸ప䛔䛯䜑䚸㓟⣲㔞䛜䜰䞁䝎䞊䝗䞊䝥䛛䜸䞊䝞䞊䝗䞊䝥䛷䛒䜛䛸⪃䛘䜙䜜䜛䚹㻰㼥 䛾๭ྜቑຍ䛻䜘䜛 㼀㼏 䛾⣔⤫ⓗ䛺ኚ໬䛿☜ㄆ䛷䛝䛺䛔䚹䛥䜙䛻䚸㻰㼥ῧຍ䛻䜘䜛 㼀㼏 䛾ኚ໬㔞䛿ᑠ䛥䛟䚸㻾㻱㻛㻮㼍 ᅛ⁐㔞䜈䛾ᙳ㡪䛿ᑠ䛥䛔䛸⪃䛘䜙䜜䜛䚹㻌㻲㼕㼓㻚㻞 䛻㻔㼅㻘㻌㻰㼥㻕㻮㼍㻯㼡㻻 䛾⮫⏺㟁ὶᐦᗘ 㻶㼏 䛾☢ሙ౫Ꮡᛶ㻔㻟㻜㻌㻷㻘㻌 㻡㻜㻌 㻷㻘㻌 㻣㻣㻌 㻷㻕䜢♧䛩䚹䛭䜜䛮䜜䛾 ᗘ㡿ᇦ䛻䛚䛔䛶㻔㼅㻘㻌㻰㼥㻕㻮㼍㻯㼡㻻㼇㻟㻦㻜㼉䛜᭱䜒㧗䛔 㻶㼏 䜢♧䛧䛯䚹㻰㼥 ῧຍ㔞䛾ቑຍ䛻䜘䜛⣔⤫ⓗ䛺ኚ໬䛿☜ㄆ䛷䛝䛺䛔䚹䛣䛾⤖ᯝ䛿䚸ඛ⾜◊✲䛾㻲㼕㼓㻚㻞㻌㻶㼏㻌㻙㻌㻮㻌㼏㼡㼞㼢㼑㼟㻌㼍㼠㻌㼢㼍㼞㼕㼛㼡㼟㻌㼠㼑㼙㼜㼑㼞㼍㼠㼡㼞㼑㼟㻌㼛㼒㻌㻟㻜㻘㻌㻡㻜㻘㻌㻣㻣㻌㻷㻌㻰㼥 ῧຍ䛻䜘䛳䛶 㼅㻮㼍㻯㼡㻻 ⁐⼥จᅛ䝞䝹䜽䛾 㻶㼏 䛜ྥୖ䛧䛯⤖㻌 㼒㼛㼞㻌㼠㼔㼑㻌㻔㼅㻘㻌㻰㼥㻕㻮㼍㻯㼡㻻㼇㼅㻞㻝㻝㻦㻌㻰㼥㻞㻝㻝㼉㻌㼎㼡㼘㼗㼟㻚㻌ᯝ䛸␗䛺䜛䚹䛥䜙䛻 㻶㼏䠉㻮 ≉ᛶ䛸 㼀㼏 䛾┦㛵䛿ぢ䜙䜜䛺䛔䚹䛭䛾䛯䜑䚸㻰㼥 ῧຍ䛻䜘䜛 㻶㼏㻌 䛾ῶᑡ䛿䚸㻾㻱㻛㻮㼍 ᅛ⁐㔞䛷䛿䛺䛟ู㻌䛾せᅉ䛜ᙳ㡪䛧䛶䛔䜛䛸⪃䛘䜙䜜䜛䚹㻰㼥 䜢ῧຍ䛧䛯䝞䝹䜽䛜㻌ప䛔 㻶㼏 䜢♧䛧䛯せᅉ䛸䛧䛶䚸㻾㻱㻞㻝㻝 䛾⢏ᚄ䛾ቑຍ䚸⤖ᬗᛶ䛾ཧ⪃ᩥ⊩㻌㻝㻚㻌㻹㻚㻌㻹㼡㼞㼍㼗㼍㼙㼕㻌㼑㼠㻌㼍㼘㻚㻦㻌㻿㼜㼑㼞㼏㼛㼚㼐㻚㻌㻿㼏㼕㻚㻌㼀㼑㼏㼔㼚㼛㼘㻚㻌㻥㻥㻌㻔㻝㻥㻥㻢㻕㻌㻝㻜㻝㻡㻌పୗ䛜⪃䛘䜙䜜䜛䚹㻌㻌㻞㻚㻌㼅㻚㻌㻿㼑㼠㼛㼥㼍㼙㼍㻌㼑㼠㻌㼍㼘㻚㻦㻌㻿㼡㼜㼑㼞㼏㼛㼚㼐㻚㻌㻿㼏㼕㻚㻌㻿㼏㼕㻚㻌㼀㼑㼏㼔㼚㼛㼘㻚㻌㻞㻞㻤㻌㻔㻞㻜㻝㻡㻕㻌㻌 ㅮ ₇ 䛷 䛿 䚸 㻾㻱㻞㻝㻝 䛾 ⢏ ᚄ ➼ 䜢 ే 䛫 䛶 㻰㼥 䜢 ῧ ຍ 䛧 䛯㻜㻝㻡㻜㻝㻠㻌
㼅㻮㼍㻯㼡㻻 ⁐⼥จᅛ䝞䝹䜽䛾 㻶㼏㻙㻮 ≉ᛶ䛻䛴䛔䛶㆟ㄽ䛩䜛䚹㻌㻌㻌― 173 ―

第95回

2017年度秋季低温工学・超電導学会

3C-a05

Y 系バルク・MgB2 バルク (2)㠀ᬗ㉁䝪䝻䞁⢊ᮎ䜢⏝䛔䛯ᾐ㏱ἲ䛻䜘䜛 㻹㼓㻮㻞 䝞䝹䜽䛾స〇䛸ᤕᤊ☢ሙ≉ᛶ㻲㼍㼎㼞㼕㼏㼍㼠㼕㼛㼚㻌㼜㼞㼛㼏㼑㼟㼟㻌㼍㼚㼐㻌㼠㼞㼍㼜㼜㼑㼐㻌㼒㼕㼑㼘㼐㻌㼜㼞㼛㼜㼑㼞㼠㼕㼑㼟㻌㼛㼒㻌㻹㼓㻮㻞㻌㼎㼡㼘㼗㻌㼜㼞㼑㼜㼍㼞㼑㼐㻌㼎㼥㻌㼕㼚㼒㼕㼘㼠㼞㼍㼠㼕㼛㼚㻌㼙㼑㼠㼔㼛㼐㻌㼡㼟㼕㼚㼓㻌㼍㼙㼛㼞㼜㼔㼛㼡㼟㻌㼎㼛㼞㼛㼚㻌㼜㼛㼣㼐㼑㼞㻌㻌ෆ⸨㻌 ᬛஅ㻘㻌 Ⲷ㔝㻌 ᪂䠈ᐩᶔ㻌 㐶ኴ䠈⸨௦㻌 ༤அ㻌 㻔ᒾᡭ኱㻕㻌㻺㻭㻵㼀㻻㻌㼀㼛㼙㼛㼥㼡㼗㼕㻘㻌㻻㻳㻵㻺㻻㻌㻭㼞㼍㼠㼍㻘㻌㼀㻻㻳㻭㻿㻴㻵㻌㼅㼛㼠㼍㻘㻌㻲㼁㻶㻵㻿㻴㻵㻾㻻㻌㻴㼕㼞㼛㼥㼡㼗㼕㻌㻔㻵㼣㼍㼠㼑㻌㼁㼚㼕㼢㻚㻕㻌㻱㻙㼙㼍㼕㼘㻦㻌㼠㼚㼍㼕㼠㼛㻬㼕㼣㼍㼠㼑㻙㼡㻚㼍㼏㻚㼖㼜㻌㻌㻝䠊䛿䛨䜑䛻㻌
㻹㼓㻮㻞 䝞䝹䜽䛾ᤕᤊ☢ሙ䜢ྥୖ䛥䛫䜛䛯䜑䛻䛿⦓ᐦ໬䛜୙ྍḞ䛷䛒䜛䚹ᚑ䛳䛶䚸㏻ᖖ 㻹㼓㻮㻞 䝞䝹䜽䛿ᅽຊୗ↝⤖ἲ㻔⇕㛫➼᪉ᅽຍᅽἲ䚸䝩䝑䝖䝥䝺䝇ἲ䚸ᨺ㟁䝥䝷䝈䝬↝⤖ἲ㻕䜔ᾐ㏱㻔ᣑᩓ㻕ἲ䛻䜘䛳䛶స〇䛥䜜䜛䚹ᡃ䚻䛿⇕㛫➼᪉ᅽຍᅽ㻔㻴㻵㻼㻕ἲ䛷స〇䛥䜜䛯 㻹㼓㻮㻞 䝞䝹䜽㻔඘ሸ⋡⣙ 㻥㻜㻑㻕䛜 㻠 䝔䝇䝷⣭☢ሙ䜢ᤕᤊฟ᮶䜛䛣䛸䜢♧䛧䛯㼇㻝㼉䚹㻴㻵㻼 ἲ䛿 㻹㼓㻮㻞 䝞䝹䜽☢▼䛾㧗ᛶ⬟໬䛻㠀ᖖ䛻᭷ຠ䛷䛒䜛䛜㧗䝁䝇䝖䛷䛒䜛䚹୍᪉䚸㻳㼕㼡㼚㼏㼔㼕䜙䛿ຍᅽ⅔䜢⏝䛔䛺䛔 㻾㼑㼍㼏㼠㼕㼢㼑㻌㻸㼕㼝㼡㼕㼐㻙㻹㼓㻌㻵㼚㼒㼕㼘㼠㼞㼍㼠㼕㼛㼚 ἲ䛷඘ሸ⋡ 㻥㻟㻑䛾 㻹㼓㻮㻞 䝞䝹䜽䛾స〇䛻ᡂຌ䛧䛯㻌 㼇㻞㼉䚹䛯䛰䛧䚸ᮍ཯ᛂ 㻹㼓 ➼䛻䜘䜛䝁䝛䜽䝔䜱䝡䝔䜱䛾ᢚไ䛻䜘䜚䚸ᤕᤊ☢ሙ䛿 㻴㻵㻼䝞䝹䜽䛻ẚ䜉䛶ప䛛䛳䛯㼇㻟㼉䚹ᡃ䚻䛿䚸ᾐ㏱ἲ䛸ᐦ㛢䜹䝥䝉䝹ἲ䜢⤌䜏ྜ䜟䛫䛶㧗඘ሸ⋡ 㻹㼓㻮㻞 䝞䝹䜽䜢స〇䛧䛶䛔䜛䚹᭱㏆䚸ᮍ཯ᛂ 㻹㼓 ṧ␃≀䛜䜋䛸䜣䛹䛺䛔 㻹㼓㻮㻞 䝞䝹䜽䛾స〇䛻ᡂຌ䛧䚸㻝㻡㻚㻥㻷 䛻䛚䛔䛶䝞䝹䜽⾲㠃䛷 㻞㻚㻠 䝔䝇䝷䛾ᤕᤊ☢ሙ䜢ᚓ䛯㼇㻠㼉䚹䛣䛾್䛿 㻴㻵㻼 䝞䝹䜽䛻༉ᩛ䛩䜛䚹䛸䛣䜝䛷䚸୍⯡ⓗ䛺㼕㼚㻙㼟㼕㼠㼡㻌 ἲ䛷䛿㠀ᬗ㉁䝪䝻䞁䛜⏝䛔䜙䜜䜛䛜䚸ᾐ㏱ἲ䛻䜘䜛䝞䝹䜽స〇䛷䛿⤖ᬗ䝪䝻䞁⢊ᮎ䛜౑⏝䛥䜜䛶䛔䜛䚹䛣䜜䛿㠀ᬗ㉁䝪䝻䞁⢊ᮎ䜢⏝䛔䜛䛸䝣䝺䞊䜽≧䛾 㻹㼓㻮㻞 䛜ฟ᮶䚸䝪䝻䞁๓㥑య䛾෇┙ᙧ≧䛜⥔ᣢ䛥䜜䛺䛔䛯䜑䛷䛒䜛䚹䛧䛛䛧䚸ྠ䛨䛟ᾐ
㏱ἲ䛷䛒䜛 㻵㼚㼠㼑㼞㼚㼍㼘㻌㻹㼓㻌㼐㼕㼒㼒㼡㼟㼕㼛㼚㻌㻔㻵㻹㻰㻕ἲ䛷䛿㠀ᬗ㉁䝪䝻䞁䛜⏝䛔䜙䜜䚸㧗 㻶㼏 䛾⥺ᮦ䛜ᐇ⌧䛥䜜䛶䛔䜛䚹䛭䛣䛷䚸ᮏ◊✲䛷䛿䜘䜚㧗䛔ᤕᤊ☢ሙ䛜ᚓ䜙䜜䜛䛸ᮇᚅ䛥䜜䜛㠀ᬗ㉁䝪䝻䞁䜢⏝䛔䛯 㻹㼓㻮㻞 䝞䝹䜽䛾స〇䜢ヨ䜏䛯䚹㻌㻌㻞䠊ᐇ㦂᪉ἲ㻌∦᪉䜢㛢䛨䛯㻌 㻿㼁㻿㻌 ⟶㻔እᚄ㻌 㻝㻜㻌 㼙㼙䚸ෆᚄ㻌 㻤㻌 㼙㼙㻕䜢⏝ព䛧䚸䜎䛪㻌 㠀ᬗ㉁ 㻮㻌 ⢊ᮎ㻔⣧ᗘ㻌 㻥㻥㻑䚸⢏ᚄ㻌 㻠㻡㻌㽀㼙㻕䜢 㻡㻌㻹㻼㼍 䛾ຍᅽୗ䛷඘ሸ䛧䛯䚹䛭䛾 㻮 ᒙ䛾ୖ䛻㻌 㻹㼓㻌 ⢊ᮎ㻔⣧ᗘ㻌 㻥㻥㻚㻡㻑䚸⢏ᚄ㻌㻝㻤㻜㻌㽀㼙㻕䜢 㻮 䛸ྠᵝ䛾ᡭ㡰䛷඘ሸ䛧䛯䚹䛭䛾ᚋ䚸䜰䝹䝂䞁㞺ᅖẼ୰䛷ᐦᑒ䛧⇕ฎ⌮䛧䛯䚹㻹㼓 䛸 㻮㻌 䛾䝰䝹ẚ䛿㻌 㻝㻚㻝㻦㻞䚸ྛᒙཌ䛿㻌 㻝㻡㻌 㼙㼙㻌 䛸䛧䛯䚹⇕ฎ⌮ ᗘ䛿㻌 㻥㻜㻜㻙㻝㻝㻜㻜䉝䚸ಖᣢ᫬㛫䛿㻌 㻥㻌 ᫬㛫䛸䛧䛯䚹⏕ᡂ≀䜢▷෉≧䜒䛧䛟䛿ᑠ∦䛻ຍᕤ䛧䛶䚸㼄 ⥺ᅇᢡ㻔㼄㻾㻰㻕䛻䜘䜛┦ྠᐃ䚸㻿㻱㻹 䜔 㻱㻮㻿㻰 䛻䜘䜛⤌⧊ほᐹ䜔 㻿㻽㼁㻵㻰 ☢᮰ィ䛻䜘䜛☢໬ ᐃ䜢⾜䛳䛯䚹䛭䛾ᚋ䚸┤ᚄ㻞㻜㻙㻟㻜 䟚䛾䝞䝹䜽䜢స〇䛧䚸☢ሙ୰෭༷╔☢ἲ䛷ᤕᤊ☢ሙ䜢ᐃ䛧䛯䚹㻌㻌㻟䠊ᐇ㦂⤖ᯝ䛸⪃ᐹ㻌㻲㼕㼓㻚㻝 䛻⇕ฎ⌮ ᗘ 㻥㻜㻜 䛚䜘䜃 㻝㻜㻜㻜䉝䚸ಖᣢ᫬㛫 㻥㼔 䛷స〇䛧䛯 㻹㼓㻮㻞 䝞䝹䜽䛾ᤕᤊ☢ሙ䛾 ᗘ౫Ꮡᛶ䜢♧䛩䚹⇕ฎ⌮ᗘ 㻥㻜㻜䉝䛷స〇䛧䛯䝞䝹䜽䛿䚸┤ᚄ 㻞㻜 䟚䝞䝹䜽䛜 㻞㻜㻌 㻷 䛻䛚䛔䛶 㻝㻚㻢㻌㼀䚸┤ᚄ 㻟㻜 䟚䝞䝹䜽䛜 㻝㻚㻤㻌㼀 䛾ᤕᤊ☢ሙ䜢♧䛧䛯䚹ᚋ⪅䛾ᤕᤊ☢ሙ್䛿⤖ᬗ䝪䝻䞁⢊ᮎ䜢⏝䛔䛶స〇䛧䛯ྠ䝃䜲䝈䛾ᾐ㏱ἲ䝞䝹䜽䛾 㻞㻌㼀 䜘䜚 㻝㻜㻑⛬ᗘప䛛䛳䛯䚹୍᪉䚸⇕ฎ⌮ ᗘ 㻝㻜㻜㻜䉝䛷స〇䛧䛯䝞䝹䜽䛾ᤕᤊ☢ሙ䛿 㻞㻜㻷 䛷 㻝㻌㼀 ⛬ᗘ䛷䛒䛳䛯䚹䛣䜜䛿䚸⢏ᡂ㛗䛻䜘䜛䝢䞁Ṇ䜑୰ᚰ䛾ῶᑡ䛻䜘䜛䛸⪃䛘䜙䜜䜛䚹㻌
ㅮ₇䛷䛿䚸ᚤ⣽⤌⧊䜔⮫⏺㟁ὶᐦᗘ䛾䝕䞊䝍➼䛸ే䛫䛶㠀ᬗ㉁䝪䝻䞁䜢⏝䛔䛯ᾐ㏱ἲ 㻹㼓㻮㻞 䝞䝹䜽䛾ྍ⬟ᛶ䛻䛴䛔䛶㆟ㄽ䛩䜛ணᐃ䛷䛒䜛䚹㻌㻌㻌㻥㻜㻜䉝㻙㻥㼔㻌 䃥㻞㻜㼙㼙㻌㻝㻜㻜㻜䉝㻙㻥㼔㻌 䃥㻞㻜㼙㼙㻌㻥㻜㻜䉝㻙㻥㼔㻌 䃥㻟㻜㼙㼙㻌㻌㻲㼕㼓㻚㻝㻦㻌㼀㼑㼙㼜㼑㼞㼍㼠㼡㼞㼑㻌㼐㼑㼜㼑㼚㼐㼑㼚㼏㼑㻌㼛㼒㻌㼠㼔㼑㻌㼠㼞㼍㼜㼜㼑㼐㻌㼒㼕㼑㼘㼐㻌㼒㼛㼞㻌㼠㼔㼑㻌㻹㼓㻮㻞㻌㼎㼡㼘㼗㼟㻌㼒㼍㼎㼞㼕㼏㼍㼠㼑㼐㻌㼍㼠㻌㻥㻜㻜㻌㼍㼚㼐㻌㻝㻜㻜㻜㻌 Υ㻌 㼒㼛㼞㻌㻥㻌㼔㻚㻌㻌ㅰ㎡㻌
㻌 ᮏ◊✲䛾୍㒊䛿㻶㻿㻼㻿⛉◊㈝㻝㻡㻷㻜㻠㻣㻝㻤㻘㻌 㻝㻡㻷㻜㻠㻢㻠㻢䛾ຓᡂ䜢ཷ䛡䛶ᐇ᪋䛧䛯䚹㻌㻌ཧ⪃ᩥ⊩㻌㻝㻚㻌 71DLWRHWDO6XSHUFRQG6FL7HFKQRO  㻞㻚㻌 **LXQFKLHWDO,QW-0RG3K\V%  㻌㻟㻚㻌 +0RFKL]XNLHWDO6XSHUFRQG6FL7HFKQRO  㻌㻠㻚㻌 71DLWRHWDO6XSHUFRQG6FL7HFKQRO  


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第95回

2017年度秋季低温工学・超電導学会

3C-a06

Y 系バルク・MgB2 バルク (2)Ẽ┦㍺㏦㻔㻹㼂㼀㻕ἲ䛻䛚䛡䜛䝬䜾䝛䝅䜴䝮ᣑᩓᶵᵓ䛾ホ౯㻱㼢㼍㼘㼡㼍㼠㼕㼛㼚㻌㼛㼒㻌㼙㼍㼓㼚㼑㼟㼕㼡㼙㻌㼐㼕㼒㼒㼡㼟㼕㼛㼚㻌㼕㼚㼠㼛㻌㼎㼛㼞㼛㼚㻌㼜㼑㼘㼘㼑㼠㻌㼎㼥㻌㼠㼔㼑㻌㻹㼍㼓㼚㼑㼟㼕㼡㼙㻌㼂㼍㼜㼛㼞㻌㼀㼞㼍㼚㼟㼜㼛㼞㼠㼍㼠㼕㼛㼚㻌㻔㻹㼂㼀㻕㻌㼙㼑㼠㼔㼛㼐బ㔝ᕝ ᝆ (ᮾி㎰ᕤ኱Ꮫ); ᒣᮏ ᫂ಖ (ᮾி㎰ᕤ኱Ꮫ࣭ᮾிᕤᴗ኱Ꮫ)SANOGAWA Yu (TUAT); YAMAMOTO Akiyasu (TUAT, TITECH)
E-mail: s172422y@st.go.tuat.ac.jp㻝㻚㻌䛿䛨䜑䛻
MgB2 ㉸ఏᑟయ[1]ࡣࠊ㔠ᒓ⣔࡜ࡋ࡚᭱㧗ࡢ 39 K ࡢ⮫⏺
ᗘ(Tc)ࢆᣢࡘࡇ࡜࠿ࡽࠊ࣒࣊ࣜ࢘ἛⅬ௨ୖࡢ㧗 ᗘ(10–20 K)࡛ࡢᛂ⏝ࡀᮇᚅࡉࢀ࡚࠸ࡿࠋ୍᪉ࠊMgB2 ࡢ୍⯡ⓗ࡞ྜᡂᡭἲ࡛࠶ࡿ in situ ἲ(Mg + 2B ĺ MgB2)࡛ࡣࠊMg ⁐⼥᫬࡟⏕ࡌࡿ✵㝽ࡀ཯ᛂᚋࡶṧᏑࡋࠊ඘ሸ⋡ࡀపࡃ(~50%)ࠊ
ࢥࢿࢡࢸ࢕ࣅࢸ࢕ࡀᢚไࡉࢀࡿࡇ࡜ࡀ▱ࡽࢀ࡚࠸ࡿ[2]ࠋ
ᡃࠎࡣࠊ㧗ᐦᗘ࣭኱ᆺ MgB2 ࣂࣝࢡయࡢ᪂ࡋ࠸స〇ἲࢆ㛤Ⓨࡍࡿࡇ࡜ࢆ┠ᣦࡋࠊMg Ẽ┦㍺㏦ἲ(MVT: Mg Vapor
Transportation method)[3]ࢆ᳨ウࡋ࡚࠸ࡿࠋMVT ἲ MgB2 ࣂࣝࢡࡣ㧗⣧ᗘ࠿ࡘ㧗ᐦᗘ࡛ࠊJc ࡣ in situ ἲ࡜ẚ㍑ࡋ࡚⣙ 2ಸ㧗࠿ࡗࡓࠋ୍᪉࡛ࠊMVT ἲࣂࣝࢡ࡟ࡣභゅᙧᵓ㐀࡜ᕧどⓗࢡࣛࢵࢡࡀࡳࡽࢀࠊᤕᤊ☢ሙ࡟ྥୖࡢవᆅࡀ࠶ࡿࡇ
࡜ࡀศ࠿ࡗࡓ[3]ࠋࡑࡇ࡛ᮏ◊✲࡛ࡣࠊMVT ἲ࡟ࡼࡿ MgB2
ࣂࣝࢡ኱ᆺ໬࡜⤌⧊ᆒ㉁໬࡟ྥࡅࡓᇶ♏ⓗ▱ぢࢆᚓࡿࡇ࡜ࢆ┠ⓗ࡜ࡋࠊẼ┦㍺㏦ࡋࡓ࣐ࢢࢿࢩ࣒࢘ࡢ࣍࢘⣲࣌ࣞࢵࢺ୰࡬ࡢᣑᩓ⌧㇟ࢆホ౯ࡋࡓࠋ㻞㻚㻌ᐇ㦂᪉ἲ
MVT ἲࡢᴫᛕᅗࢆ Fig. 1(a)࡟♧ࡍࠋ๓㥑య࡜࡞ࡿ෇┙≧࣍࢘⣲࣌ࣞࢵࢺ࡜ Mg ※ࢆศ㞳ࡋ࡚㓄⨨ࡋ࡚ຍ⇕ࡋࠊ
Mg ※࠿ࡽ⵨Ⓨࡋࡓ Mg ⵨ẼࢆࠊᏍࢆᣢࡘ㝸ቨࢆ௓ࡋ࡚࣍
࢘⣲㒊࡟㍺㏦ࠊᣑᩓ࣭཯ᛂࡉࡏࡓࠋᮏ◊✲࡛ࡣࠊ୰ᚰ࡟┤ᚄ 1 mm ࡢ Mg ᣑᩓᏍࢆᣢࡘ༢Ꮝ㝸ቨࢆ⏝࠸ࡓࠋ๓㥑య࡜࡞ࡿ࣍࢘⣲ࡢ඘ሸ⋡ PB ࢆ 50%࡜ࡋ࡚ࠊ෇┙≧࡟ࣉࣞࢫᡂ
ᆺᚋࠊ700, 800, 900, 1000°C ࡟࠾࠸࡚ࡑࢀࡒࢀ 12, 24, 48 hࡢ⇕ฎ⌮ࢆ᪋ࡍࡇ࡜࡛┤ᚄ 10 mmࠊཌࡳ 10 mm ࡢ෇┙≧ࣂࣝࢡయࢆᚓࡓࠋࡲࡓࠊẚ㍑ᑐ㇟࡜ࡋ࡚ࠊ2 mm 㞳ࢀࡓ஧ࡘࡢ Mg ᣑᩓᏍࢆᣢࡘ஧Ꮝ㝸ቨࢆ⏝࠸࡚ࠊ800°C ࡟࠾࠸࡚12, 24, 48 h ࡢ⇕ฎ⌮ࢆ᪋ࡋࡓ┤ᚄ 10 mmࠊཌࡳ 10 mm ࡢ෇┙≧ࣂࣝࢡయࢆྠᵝ࡟ᚓࡓࠋヨᩱࡢᵓᡂ┦ࡣ X ⥺ᅇᢡ࡟ࡼࡾࠊᚤ⣽ᵓ㐀࣭໬Ꮫ⤌ᡂࡣ SEM࣭EDX ࡟ࡼࡾホ౯ࡋࡓࠋࣂࣝࢡయࡢ཯ᛂ⋡ ȝ ࡣᣑᩓࡋࡓ Mg ࡢ㉁㔞 (g)
(%) =
× 100
MgB2 ⏕ᡂ᏶⤖࡟ᚲせ࡞ Mg ࡢ㉁㔞 (g)࡜ᐃ⩏ࡋ࡚ぢ✚ࡶࡗࡓࠋ㻟䠊⤖ᯝ䛸⪃ᐹ
Fig. 1(b)ࡣ༢Ꮝ㝸ቨࢆ⏝࠸࡚స〇ࡋࡓࣂࣝࢡయࡢ Mg ᣑᩓ㠃⾲㠃እほ࡛࠶ࡿࠋ༢Ꮝ㝸ቨࢆ⏝࠸ࡓሙྜࡣࠊ⇕ฎ⌮᮲௳࡟ࡼࡽࡎࠊMg ࡀྠᚰ෇≧࡟ᣑᩓࡋ࡚࠸ࡃᵝᏊࡀࡳࡽࢀࠊ
ከᏍ㝸ቨࢆ⏝࠸ࡓࣂࣝࢡయ࡟࠾࠸࡚ほᐹࡉࢀࡓභゅᙧᵓ㐀ࡣ⏕ᡂࡋ࡞࠿ࡗࡓࠋ700°C ࡛ࡣ Mg ࡢᣑᩓࡣ࡯࡜ࢇ࡝ࡳ
ࡽࢀ࡞࠿ࡗࡓࡀࠊ1000°C,48 h ࡢ⇕ฎ⌮࡛ࡣ㢧ⴭ࡟ Mg ࡢᣑᩓࡀࡳࡽࢀࡓࠋ཯ᛂ⋡ ȝ ࡢ⇕ฎ⌮᫬㛫౫Ꮡᛶࢆ Fig. 2 ࡟♧ࡍࠋ⇕ฎ⌮᫬㛫࡜࡜ࡶ࡟ ȝ ࡣቑ኱ࡍࡿഴྥࡀࡳࡽࢀࡓࠋ
ࡲࡓࠊ㧗 ࡯࡝ ȝ ࡀ኱ࡁࡃ࡞ࡿഴྥ࡟࠶ࡾࠊ700°C ࡛ࡣ㠀ᖖ࡟ᑠࡉࡃࠊ1000°C ࡛ࡣ 800, 900°C ࡜ẚ㍑ࡋ࡚⣙ 2-3 ಸ኱ࡁ࠿ࡗࡓࠋ㧗 ࡛ ȝ ࡀ㧗࠸⌮⏤ࡢ୍ࡘ࡜ࡋ࡚ࠊ㔠ᒓ Mg
ࡢᖹ⾮⵨ẼᅽࡀἛⅬ 1100°C ࡟㏆࡙ࡃ࡟ࡘࢀ࡚ୖ᪼ࡍࡿࡇ
࡜ࡀᣲࡆࡽࢀࡿࠋ
Fig. 3 (a)ࡣ஧Ꮝ㝸ቨࢆ⏝࠸࡚స〇ࡋࡓࣂࣝࢡయࡢ Mg ᣑᩓ㠃⾲㠃እほ࡛࠶ࡿࠋ஧Ꮝ㝸ቨࢆ⏝࠸ࡓሙྜࡶࠊ஧Ꮝࡢ୰
ᚰ㒊࠿ࡽྠᚰ෇≧࡟ᗈࡀࡿࡼ࠺࡟ Mg ࡣᣑᩓࡋ࡚࠾ࡾࠊභ
ゅᙧᵓ㐀ࡢ⏕ᡂࡣほᐹࡉࢀ࡞࠿ࡗࡓࠋFig. 3(c)ࡣ஧ࡘࡢ
Mg ᣑᩓᏍࢆ㏻ࡿࡼ࠺࡟ษ᩿ࡋࡓ᩿㠃(Fig. 3(b)୰ࡢⅬ⥺࡛

Fig. 1 (a) Conceptual diagram of the MVT method. (b)Appearance of the surfaces for the bulks prepared with “1” holed
division wall with various heating conditions.

Fig. 2 Heating time dependence of reaction rate P .

(a)

(b)

(C)

Unreacted B

unreacted B

Mg diīusion front

crack B
crack A

crack CMg Mg
Mg

crack C
crack B
1 mm 1 mm

Mg

Mg diīusion

1 mm

Fig. 3 Appearance and microstructure of a bulk prepared with
“2” holed division wall heated at 800°C for 24 h. (a) Photographof the bulk. (b) Conceptual diagram of the MVT with “2” holes.
(c) Back scattered electron image of the cross-sectional area
indicated by dotted box in (b).
ᅖࡗࡓ㒊ศ)ࡢ཯ᑕ㟁Ꮚീ࡛࠶ࡿࠋ୰ኸୗ㒊ࡢ Mg ᣑᩓᏍࢆ㉳Ⅼ࡟ྠᚰ෇≧࡟ Mg ࡀᣑᩓࡋࡓ㡿ᇦ㸦᫂ࡿ࠸⅊Ⰽ㸧ࡀࡳࡽࢀࡿࡀࠊࡶ࠺୍ࡘࡢᣑᩓᏍࡀ࠶ࡿྑഃ࡛ Mg ᣑᩓ㡿ᇦࡀᣑ኱ࡋ࡚࠾ࡾᕥྑ㠀ᑐ⛠࡛࠶ࡗࡓࠋMg ᣑᩓᏍࢆ㉳Ⅼ࡟
Ⓨ㐩ࡋࡓࢡࣛࢵࢡ Aࠊⓑ◚⥺࡛♧ࡋࡓ Mg ᣑᩓࣇࣟࣥࢺ࡟
ᑐࡋ࡚ᆶ┤࡟ࠊᣑᩓᏍ࠿ࡽᨺᑕ≧᪉ྥ࡟Ⓨ㐩ࡋࡓࢡࣛࢵ
ࢡ Bࠊࣂࣝࢡ⾲㠃࡟ᑐࡋ࡚ᖹ⾜࡟Ⓨ㐩ࡋࡓࢡࣛࢵࢡ C ࡀ⏕ࡌࡓࠋMg ᣑᩓࡀ㔜࡞ࡗࡓ㡿ᇦ࡟Ꮡᅾࡍࡿࢡࣛࢵࢡ C ࡣ஧Ꮝ㝸ቨࢆ⏝࠸ࡓ㝿࡟⏕ࡌࡿ≉ᚩⓗࢡࣛࢵࢡ࡛࠶ࡿ࡜⪃࠼ࡽࢀࡿࠋFig. 2 ࡟♧ࡍࡼ࠺࡟ࠊ஧Ꮝ㝸ቨࢆ⏝࠸࡚స〇ࡋࡓࣂࣝࢡయࡢ ȝ ࡣࠊ༢Ꮝ㝸ቨࢆ⏝࠸ࡓሙྜ࡜ẚ㍑ࡋ࡚⣙
1.2-3 ಸ኱ࡁ࠿ࡗࡓࠋ
ཧ⪃ᩥ⊩
1. J. Nagamatsu et al., Nature 410, 63 (2001).
2. A. Yamamoto et al., Supercond. Sci. Technol. 20, 658 (2007).
3. బ㔝ᕝᝆࡽࠊ➨ 94 ᅇప ᕤᏛ䞉㉸㟁ᑟᏛ఍ p.23䠄2017䠅.

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3C-a07

MgB2 (2)0J%& ࢆⅣ⣲※࡟⏝࠸ࡓ 0J% ࣂࣝࢡࡢ≀ᛶ
3K\VLFDO3URSHUWLHVRI0J%%XONVXVLQJ0J%&DV&DUERQ6RXUFH⃝⏣ⓒࠎᏊ㧗ᮌ⳯᦬ඖᮌ㈗๎ୗᒣ῟୍ 㟷Ꮫ኱ ඣ⋢୍᐀⏣୰⚽ᶞ ᪥❧ 
6$:$'$0RPRNR7$.$*,1DWVXPL0272.,7DNDQRUL6+,02<$0$-XQLFKL $R\DPD*DNXLQ8QLY  .2'$0$0RWRPXQH7$1$.$+LGHNL +LWDFKL (PDLOF#DR\DPDMSࡣࡌࡵ࡟
 0J% ࡣ↓㓄ྥࡢከ⤖ᬗయ࡛ࡶ㧗࠸ -F ࢆ♧ࡍࡀࠊ☢ሙୗ࡛ᛴ⃭࡟ῶ⾶ࡍࡿࡇ࡜ࡀㄢ㢟࡛࠶ࡿࠋ0J% ࡛ࡣ⢏⏺ࡀ୺せ࡞ࣆࣥࢽࣥࢢࢧ࢖ࢺ࡛࠶ࡿࡇ࡜࠿ࡽࠊ☢ሙ୰ -F ࡢᨵၿ᪉ἲ࡜ࡋ࡚ࡣ⤖ᬗ⢏ࡢᚤ⣽໬ࡸ⢏ᡂ㛗ࡢᢚไ>@ࠊ% ࢧ࢖ࢺ࡬ࡢ & ࢻ࣮ࣉ>@ࡀ▱ࡽࢀ࡚࠸ࡿࠋࡋ࠿ࡋࠊ& ࡢᐇຠ⨨᥮㔞ࡣ௙㎸⤌ᡂࡼࡾᑡ࡞࠸ࡇ࡜ࡀከࡃࠊ⢏㛫⤖ྜࡢຎ໬ࡸᮍ཯
ᛂ୙⣧≀ࡢṧᏑࢆక࠺ࠋࡍ࡞ࢃࡕࠊ㉸ఏᑟ≉ᛶࡸᚤ⣽⤌⧊
ࡣⅣ⣲ᮦᩱࡢ཯ᛂᛶ࡟ࡼࡗ࡚኱ࡁࡃኚ໬ࡍࡿࡇ࡜࠿ࡽࠊࢻ
࣮ࣉ㔞ࡸ↝ᡂ᮲௳ࡢ᭱㐺໬ࡔࡅ࡛࡞ࡃࠊⅣ⣲ᮦᩱࡢ㑅ᢥࡀ☢ሙୗ࡛ࡢ -F ࡢᨵၿ࡟㔜せ࡛࠶ࡿࠋⅣ⣲※࡜ࡋ࡚ 6L& ࡸࢥࣟࢿࣥ࡞࡝ࡢⅣ໬Ỉ⣲ࢆ⏝࠸ࡓ◊✲౛ࡀከ࠸ࡀࠊᚲࡎ๪
⏕ᡂ≀ࢆ⏕ࡌࡿࡓࡵࠊ௒ᅇᡃࠎࡣ 0J%& ⣔࡟╔┠ࡋࡓࠋᮏ◊✲࡛ࡣࠊ0J% ࡜ఝࡓ⤖ᬗᵓ㐀ࢆᣢࡘ 0J%& ࡸ㧗⃰ᗘ & ࢻ࣮ࣉ 0J% ࢆ᪂ࡓ࡞Ⅳ⣲ᮦᩱ࡜ࡋ࡚⏝࠸ࡿࡇ࡜࡛
☢ሙ୰ -F ࡢྥୖࢆヨࡳ࡚࠸ࡿࠋᚑ᮶ 0J%& ࡣ & ௨ୖࡢ㧗 㧗ᅽຊୗ࡛⏕ᡂࡍࡿ≀㉁࡜⪃࠼ࡽࢀ࡚࠸ࡓࡀࠊ
0J% ࡜ྠᵝ࡟ 3,7 ἲ䛻䜘䜚ᖖᅽୗ䛷↝ᡂ䛩䜛䛣䛸䛷⣧ᗘࡣప࠸ࡶࡢࡢ 0J%& ࡀྜᡂ࡛ࡁࡿࡇ࡜ࢆぢฟࡋࠊ๓ᅇሗ࿌
ࡋࡓ>@ࠋ௒ᅇࡣࠊࡉࡽ࡟⣧ᗘࡢ㧗࠸ 0J%& ࡢྜᡂࢆ┠ᣦࡍ࡜࡜ࡶ࡟ࠊ0J% ࡟ᑐࡍࡿ᪂ࡋ࠸Ⅳ⣲※࡜ࡋ࡚ࡢ≉ᚩࢆㄪ࡭ࡓ⤖ᯝࢆሗ࿌ࡍࡿࠋ

K ↝ᡂ 䛾 . 䛻䛚䛡䜛 -F 䛾☢ሙ౫Ꮡᛶ䜢 )LJ 䛻♧䛩䚹㧗⣧ᗘ䛾 0J%& ⢊ᮎ䛾⢏ᚄ䛿䛫䛔䛬䛔 PP 䛸ᑠ䛥䛔䛣䛸䛜䜟䛛䛳䛯䚹䜎䛯䚸ᐇຠ & ⨨᥮㔞䛿ᑠ䛥䛔䜒䛾䛾 0J%& 䝗䞊䝥 0J% 䛿ẚ㍑ⓗඃ䜜䛯☢ሙ୰ -F ≉ᛶ䜢♧䛧䛯䚹 ࡲࡓ㧗⃰ᗘ & ࢻ࣮ࣉ 0J% ࢆⅣ⣲※࡜ࡋ࡚ & ࢻ࣮ࣉ
0J% ࢆస〇ࡍࡿሙྜ࡟ࡣࠊᐇ㉁ⓗ࡟ཎᩱ⢊ᮎ࡟᪤〇ࡢ
0J% ࢆΰྜࡍࡿ SUHPL[ ἲ࡜࡞ࡿࡓࡵࠊSUHPL[ ẚࡀ  ࡜࡞ࡿࡼ࠺࡟ࣀࣥࢻ࣮ࣉ 0J% ࢆΰྜࡋㄪᩚࡋࡓࠋㅮ₇࡛ࡣࠊC ⃰ᗘࡢ୙ᆒ୍ศᕸࡸᚤ⣽⤌⧊ไᚚ࡜㉸ఏᑟ≉ᛶ࡜ࡢ┦㛵࡟ࡘ࠸࡚ࡶሗ࿌ࡍࡿࠋ

ᐇ㦂᪉ἲ ᮏ◊✲࡛ࡣࠊ0Jࠊ% ࠾ࡼࡧⅣ⣲ཎᩱࡢ⢊ᮎࢆΰྜࡋ↝ᡂࡍࡿ LQVLWX ἲ࡟ࡼࡾ 0J%[&[ [ ± ࣂࣝࢡࢆస〇ࡋ㉸ఏᑟ≉ᛶࢆẚ㍑ࡋࡓࠋලయⓗ࡟ࡣୖグࡢΰྜ⢊ᮎࢆ
686 ⟶࡟඘ሸᚋࠊ୧➃ࢆᑒࡌࠊ୍㍈ࣉࣞࢫ࡟ࡼࡾᯈ≧࡟ᡂᆺࡋࠊ▼ⱥ⟶࡟✵Ẽ୰࡛ᑒධࡋ ±&±K ࡢᵝࠎ࡞᮲௳࡛↝ᡂࢆ⾜ࡗࡓࠋⅣ⣲※࡟ࡣ 0J%& ࡸணࡵྜᡂࡋࡓ㧗⃰ᗘ & ࢻ࣮ࣉ 0J% ࢆ⏝࠸ࠊẚ㍑࡜ࡋ࡚◊✲౛ࡢ
ከ࠸ %& ࡸᚤ⢏Ꮚ & ࣮࢝࣎ࣥࣈࣛࢵࢡ ࢆ⏝࠸ࡓヨᩱࡶస〇ࡋࡓࠋヨᩱࡢᚤ⣽⤌⧊࡜ඖ⣲ศᕸࡣ 6(0(30$ ࡟ࡼࡾㄪ࡭ࠊᵓᡂ┦ࡸ᱁Ꮚᐃᩘࠊ⤖ᬗᛶࡣ⢊ᮎ ;5' ᐃ࡟ࡼࡾࠊ㉸ఏᑟ≉ᛶࡣ 648,' ☢᮰ィࢆ⏝࠸ࡓ☢໬ ᐃ࡜஺ὶᅄ➃Ꮚἲ࡟ࡼࡿ᢬ᢠ⋡ ᐃࢆ⾜࠸ホ౯ࡋࡓࠋࡲࡓヨᩱࡢᐇຠ & ⨨᥮㔞 [$ ࢆ௨ୗࡢᘧࢆ⏝࠸࡚⟬ฟࡋࡓ>@ࠋ[$  D   D>QP@ ヨᩱࡢ D ㍈㛗)LJ   6HFRQGDU\ HOHFWURQ LPDJHV RI 0J% 
SRZGHUDQG0J%&GRSHG0J%EXONV)LJ   -F+ FXUYHV DW  . RI 0J%& EXONVSUHSDUHGIURPYDULRXVFDUERQVRXUFHV⤖ᯝ࡜⪃ᐹ
 3,7 ἲ࡟ࡼࡾ 0J%& 䜢స〇䛩䜛㝿䛻䚸% 䛸 & 䛾ΰྜ⢊ᮎ
䜢 0J 䛸ศ䛡䛶㔠ᒓ⟶䛻඘ሸ䛩䜛ᣑᩓἲ䛾᥇⏝䛻䜘䜚 &䛸䛔䛖ẚ㍑ⓗప 䛷䛾⇕ฎ⌮䛻䜘䜚 0J2 䛺䛹䛾୙⣧≀䛜ᑡ䛺䛔㧗⣧ᗘ䛾 0J%& 䛜ᚓ䜙䜜䛯䚹స〇䛧䛯 0J%& ⢊ᮎ䛸䛭䜜䜢䝗䞊䝥䛧䛯 & 䝗䞊䝥 0J% 䝞䝹䜽䛾◊☻㠃䛾஧ḟ㟁Ꮚീ䜢 )LJ 䛻䚸ᵝ䚻䛺Ⅳ⣲※䜢䝗䞊䝥䛧䛯 0J% 䝞䝹䜽 &ཧ⪃ᩥ⊩>@506FDQODQHWDO-$SSO3K\V  
>@6;'RXHWDO$SSO3K\V/HWW  
>@06DZDGDHWDO$EVWUDFWVRI&66-&RQIHUHQFH  >@$<DPDPRWRHWDO6XSHUFRQG6FL7HFKQRO  

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3C-a08

MgB2 (2)Premix-PICT-Diffusion ἲ࡟ࡼࡾస〇ࡋࡓ㧗ᐦᗘ MgB2 ࣂࣝࢡࡢᚤ⣽⤌⧊ไᚚControl of microstructure of dense MgB2 bulks prepared by Premix-PICT-Diffusion method㧗ᮌ ⳯᦬, ⃝⏣ ⓒࠎᏊ, ఀ⸨ ᫭, ඖᮌ ㈗๎, ୗᒣ ῟୍ (㟷Ꮫ኱) ; ඣ⋢ ୍᐀, ⏣୰ ⚽ᶞ (᪥❧)
TAKAGI Natsumi, SAWADA Momoko, ITO Hikaru, MOTOKI Takanori, SHIMOYAMA Jun-ichi (Aoyama Gakuin Univ.);
KODAMA Motomune, TANAKA Hideki (Hitachi)
E-mail: c5617053@aoyama.jp

⥴ゝ
MgB2 ࡣཎᩱࡀ㇏ᐩࠊྜᡂࡀẚ㍑ⓗᐜ࡛᫆࠿ࡘ໬Ꮫⓗ࡟Ᏻᐃ࡛࠶ࡿ࡞࡝ࡢ㛗ᡤࢆᣢࡕࠊࡑࡢ⥺ᮦࡣ MRIࠊ☢Ẽᾋୖิ㌴⏝ࡢ☢▼ࡸ㏦㟁࡞࡝࡬ࡢᛂ⏝ࡀᮇᚅࡉࢀ࡚࠸ࡿࡀࠊ
MgB2 ᮦᩱࡢᗈ⠊࡞ᛂ⏝࡟ᑐࡋ࡚ࡣ≉࡟☢ሙ୰ࡢ⮫⏺㟁ὶ≉ᛶࡢᨵၿࡀ୙ྍḞ࡛࠶ࡿࠋ୍᪉ࠊᇶ♏ⓗ࡞ MgB2 ከ⤖ᬗయࡢ⮫⏺㟁ὶ≉ᛶࢆỴᐃࡍࡿᵝࠎ࡞」ྜⓗ࡞ᅉᏊࡢ⌮ゎࡶ༑ศ࡛ࡣ࡞࠸ࠋ↓㓄ྥ MgB2 ከ⤖ᬗయࡢ⮫⏺㟁ὶ≉ᛶࡢ୺࡞ᨭ㓄ᅉᏊࡣࠊ⣧ᗘࠊ඘ሸ⋡ࠊ⢏⏺ᐦᗘ࡛࠶ࡾࠊ඘ሸ⋡ࡀ 100%࡟㏆࠸⢏㛫⤖ྜ࡟ඃࢀࡿከ⤖ᬗయࡢస〇࡟ࡣ B ࡜
MgB2 ࡢ ΰ ྜ ⢊ ᮎ ࡢ ᅽ ⢊ య ࡟ Mg ࢆ ᣑ ᩓ ࡉ ࡏ ࡿPremix-PICT-ᣑ ᩓ ἲ [1]ࡀ 㐺 ࡋ ࡚ ࠸ ࡿ ࠋ ࡲ ࡓ ⤖ ᬗ⢏⏺ࡣ
MgB2 ࡟࠾ࡅࡿ୺࡞ࣆࣥࢽࣥࢢࢭࣥࢱ࣮࡛࠶ࡾࠊ⢏⏺ࡢ㧗ᐦᗘ໬࡟ࡣᚤ⣽࡞ཎᩱ B ⢊ᮎࡢ౑⏝ࡸప ↝ᡂ࡟ࡼࡿ⢏ᡂ㛗ࡢᢚไࡀ᭷ຠ࡛࠶ࡿࠋᮏ◊✲࡛ࡣࠊPremix-PICT ᣑᩓἲ࡟ࡼࡾ㧗⣧ᗘࠊ㧗඘ሸ⋡ࡢ MgB2 ࣂࣝࢡࢆస〇ࡋࠊࡑࡢ⮫⏺㟁ὶ≉ᛶࠊᚤ⣽⤌⧊ࡢホ౯ࡼࡾࠊ⮫⏺㟁ὶ≉ᛶỴᐃᅉᏊࡢ⌮ゎࢆ῝ࡵࡿࡇ࡜ࢆ┠ᣦࡋ࡚࠸ࡿࠋ
ᐇ㦂᪉ἲ
Premix-PICT ᣑᩓἲ࡟ࡼࡾ඘ሸ⋡~80%ࢆ㉸࠼ࡿ㧗ᐦᗘ
MgB2 ࣂࣝࢡࢆᵝࠎ࡞↝ᡂ᮲௳ୗ࡛స〇ࡋࡓࠋࡲࡎࠊ࠶ࡽ
࠿ࡌࡵ B ࡜ΰྜࡍࡿ MgB2 ࡣ in-situ ἲ࠾ࡼࡧ PICT ᣑᩓἲ[2]࡟ࡼࡾྜᡂࡋࡓࠋࡇࢀ࡜ B ࡢΰྜẚࢆ⣔⤫ⓗ࡟ኚ࠼ࡓΰ ྜ ⢊ ᮎ ࡢ ᅽ ⢊ య ࡜ Mg(#200 ࠾ ࡼ ࡧ ⢏ ᚄ 1 mm) ࢆ
SUS316 ⟶ෆ࡟ᑒධࡋࠊࡉࡽ࡟▼ⱥ⟶࡟ᑒධࡋ⇕ฎ⌮ࢆ⾜ࡗࡓࠋPICT ᣑᩓἲ࡛ࡢ Premix ࡍࡿ MgB2 ࡢྜᡂࠊ࠾ࡼࡧ
Premix-PICT ᣑᩓἲ࡛ࡢ㧗ᐦᗘ MgB2 ࣂࣝࢡ࡟ᑐࡍࡿࣉࣞ
࢔ࢽ࣮ࣝࡣࠊ᭱⤊ⓗ࡟ᚓࡽࢀࡿ MgB2 ࣂࣝࢡ࡟ྵࡲࢀࡿ
MgO ࢆῶࡽࡍࡇ࡜ࢆ┠ⓗ࡜ࡋ࡚⾜ࡗࡓࡶࡢ࡛࠶ࡿࠋᚓࡽ
ࢀࡓヨᩱࡢᚤ⣽⤌⧊ࡣ SEM ࡟ࡼࡾほᐹࡋࠊ㉸ఏᑟ≉ᛶࡣSQIUD ☢᮰ィ࡟ࡼࡿ☢໬ ᐃ࡟ࡼࡾホ౯ࡋࡓࠋ࡟ྵࡲࢀࡿ MgO ࡣ኱ࡁࡃపῶࡋࡓࠋ◊☻㠃ࡢᚤ⣽⤌⧊ࡢゎᯒࡼࡾồࡵࡓ⢏⏺ᐦᗘ࡜↝ᡂ᮲௳ࠊ⣧ᗘ࠾ࡼࡧ Jc ࡢ㛵ಀ࡟ࡘ࠸࡚ࡶሗ࿌ࡍࡿࠋ

Fig. 1 Relationship between premix ratio y and Jc (20 K,~0 T). Relative density is shown below each plot.

⤖ᯝ࡜⪃ᐹ
800°Cࠊ72 h ࡢ⇕ฎ⌮࡟ࡼࡾᵝࠎ࡞ MgB2(in-situ ἲ)࡜ Bࡢΰྜẚࡢᅽ⢊య࡟ Mg ࢆᣑᩓࡉࡏࡓ࡜ࡇࢁࠊFig. 1 ࡟♧ࡍࡼ࠺࡟ΰྜ⢊ᮎ୰ࡢ MgB2: B = 1 : 3 ࡛඘ሸ⋡ࡣ~96.8%
࡟࡞ࡾࠊྠ᫬࡟ Jc ≉ᛶࡀᨵၿࡍࡿࡇ࡜ࡀࢃ࠿ࡗࡓࠋ୍㐃ࡢ⤖ᯝࡣᣑᩓ཯ᛂ࡛⏕ᡂࡋࡓ MgB2 ࡀ୺࡟㧗࠸ Jc ࢆᢸ࠺ᙉ࠸⢏㛫⤖ྜࢆసࡿࡇ࡜ࢆ♧၀ࡋ࡚࠸ࡿࠋࡑࡇ࡛ Premix ࡍࡿ MgB2 ࡢ⣧ᗘࢆ㧗ࡵࡿࡓࡵ࡟ PICT-ᣑᩓἲ࡛స〇ࡋࡓ࡜ࡇࢁࠊMgO ࡢྵ᭷㔞ࡀపῶࡋࡓࠋࡉࡽ࡟ MgO ࡢ⏕ᡂࢆᢚไࡍࡿࡓࡵ Premix-PICT ᣑᩓἲ࡟ࡼࡿ㧗ᐦᗘ MgB2 ࣂࣝࢡࡢస〇࡟࠾࠸࡚ࣉࣞ࢔ࢽ࣮ࣝ(650–700°C, 12 h)㐣⛬ࡢ㏣ຍࢆ⾜ࡗࡓࠋFig. 2 ࡟ᵝࠎ࡞᮲௳࡛స〇ࡋࡓヨᩱࡢ 20 K ࡟࠾ࡅࡿ Jc㸫H ≉ᛶࢆ♧ࡍࠋJc ࡢ㢧ⴭ࡞ᨵၿࡣࡇࢀࡲ࡛ࡢ࡜ࡇ
ࢁ࡞࠸ࡀࠊJc ࡢ෌⌧ᛶࡣⰋࡃࠊࡲࡓࠊ㧗ᐦᗘ MgB2 ࣂࣝࢡ

Fig. 2 Jc-H curves at 20 K of dense MgB2 bulks preparedwith pre-annealing process at 650°C or 700°C before
Premix-PICT-Diffusion. Premixed MgB2 powders
were prepared by PICT-Diffusion at 900°C for 12 h.
ཧ⪃ᩥ⊩[1] I. Iwayama, et al., Physica C 460-462 (2007) 581-582.
[2] S. Ueda et al., Appl. Phys. Lett. 86 (2005) 222502.

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2017年度秋季低温工学・超電導学会

3C-a09

MgB2 (2)ࢫ࢙࣮࢘ࢪຍᕤࢆ㐺⏝ࡋ࡚స〇ࡋࡓ in situ PIT 7 ⰺ MgB2 ⥺ᮦࡢ⤌⧊࡜≉ᛶ
㻹㼕㼏㼞㼛㼟㼠㼞㼡㼏㼠㼡㼞㼑㻌㼍㼚㼐㻌㼟㼡㼜㼑㼞㼏㼛㼚㼐㼡㼏㼠㼕㼚㼓㻌㼜㼞㼛㼜㼑㼞㼠㼕㼑㼟㻌㼛㼒㻌㼕㼚㻌㼟㼕㼠㼡㻌㻼㻵㼀㻌㻣㻙㼒㼕㼘㼍㼙㼑㼚㼠㼍㼞㼥㻌㻹㼓㻮䈻㻌 㼣㼕㼞㼑㼟㻌㼒㼍㼎㼞㼕㼏㼍㼠㼑㼐㻌㼣㼕㼠㼔㻌㼟㼣㼍㼓㼕㼚㼓㻌⇃಴ᾈ᫂㻔㻺㻵㻹㻿㻕㻘㻌 㰺⸨㻌 ♸ு㻘㻌 ᮧୖ㻌 㞞ே㻔Ⱚᾆᕤ኱㻕㻌㻷㼁㻹㻭㻷㼁㻾㻭㻌㻴㼕㼞㼛㼍㼗㼕㻘㻌㻿㻭㻵㼀㻻㻌㼅㼡㼟㼡㼗㼑㻘㻌㻹㼁㻾㻭㻷㻭㻹㻵㻌㻹㼍㼟㼍㼠㼛㻌㻔㻿㼔㼕㼎㼍㼡㼞㼍㻌㻵㼚㼟㼠㼕㼠㼡㼠㼑㻌㼛㼒㻌㼀㼑㼏㼔㼚㼛㼘㼛㼓㼥㻕㻌㻱㻙㻹㼍㼕㼘㻦㻷㼁㻹㻭㻷㼁㻾㻭㻚㻴㼕㼞㼛㼍㼗㼕㻬㼚㼕㼙㼟㻚㼓㼛㻚㼖㼜㻌 ࡣࡌࡵ࡟ ᭱ࡶ୍⯡ⓗ࡞ MgB2 ⥺ᮦస〇ἲ࡛࠶ࡿ in situ PIT ἲ࡟࠾࠸࡚ࡣࠊᚓࡽࢀࡿ MgB2 ࢥ࢔ࡢ඘ሸ⋡ࡀప࠸ࡓࡵ࡟ࠊ㧗࠸⮫⏺㟁ὶᐦᗘ Jc ࡀᚓࡽࢀ࡞࠸࡜࠸࠺㞴Ⅼࡀ࠶ࡿࠋᡃࠎࡣ
ࡇࢀࡲ࡛࡟ࠊin situ PIT ἲ࡟ࡼࡿ MgB2 ༢ⰺ⥺ᮦ࡟࠾࠸࡚ࠊ
㕲ࢳ࣮ࣗࣈ࡟ Mg ࡜ B ࡢΰྜ⢊ᮎࢆ඘ሸࡋࡓࣅࣞࢵࢺ࡟ᑐ
ࡋ࡚ࠊࣅࣞࢵࢺ࠿ࡽ᭱⤊ᚄࡢ⥺ᮦ࡟࠸ࡓࡿࡲ࡛ࢫ࢙࣮࢘ࢪ
ࣥࢢ࣐ࢩࣥ࡟ࡼࡗ࡚ຍᕤࡍࡿ࡜ Mg ⢏ࡀࣇ࢕࣓ࣛࣥࢺ≧࡟ຍᕤࡉࢀࡿ࡜࡜ࡶ࡟ࠊࡲࡓ Mg+B ࢥ࢔ࡢ඘ሸ⋡ࡀྥୖࡋ࡚㧗࠸ Jc ࡀᚓࡽࢀࡿࡇ࡜ࢆⓎ⾲ࡋࡓࠋ௒ᅇࡣྠᵝࡢࢫ࢙࣮࢘ࢪࣥࢢຍᕤ࡟ࡼࡗ࡚ 7 ⰺ⥺ᮦࢆస〇ࡋࠊ㏻ᖖࡢ⁁࣮ࣟࣝຍᕤ㸩ࢲ࢖ࢫຍᕤ࡟ࡼࡿ 7 ⰺ⥺ᮦ࡜⤌⧊࡞ࡽࡧ࡟⮫⏺㟁ὶ≉ᛶࢆẚ㍑ࡋࡓࠋ ᐇ㦂᪉ἲእᚄ 6mmࠊෆᚄ 3.5mm ࡢ⣧㕲ࢳ࣮ࣗࣈ࡟ 4.5%ࡢ࣮࢝࣎
ࣥࢆࢥ࣮ࢺࡋࡓ࣎ࣟࣥ B(CCB)࡜ Mg ࡢΰྜ⢊ᮎࢆ඘ሸࡋࠊ
ࢫ࢙࣮࢘ࢪࣥࢢຍᕤࡢࡳ࡛ᚄ 1mm ࡢ⥺ᮦ࡟ຍᕤࡋࡓࠋࡲ
ࡓࠊC24H12 ࢆῧຍࡋࡓ B ⢊ᮎࢆ⏝࠸࡚ྠᵝ࡟ࡋ࡚ 1mm ᚄࡢ⥺ᮦࢆస〇ࡋࡓࠋࡇࢀࡽࡢ⥺ᮦ࠿ࡽ㛗ࡉ 50mm ࡢ▷ᑻ⥺ᮦࢆษࡾฟࡋࠊ7 ᮏࢆ᮰ࡡ࡚ࡉࡽ࡟እᚄ 6mmࠊෆᚄ 3.5mm
ࡢ㕲ࢳ࣮ࣗࣈ࡟ᤄධࡋ࡚ࢫ࢙࣮࢘ࢪຍᕤ࡟ࡼࡗ࡚ᚄ 1mm
ࡢ 7 ⰺ⥺ᮦ࡟ຍᕤࡋࡓࠋࡲࡓ⁁࣮ࣟࣝᅽᘏ࡜࣮࣮ࣟࣛࢲ࢖
ࢫ⥺ᘬࢆ⏝࠸࡚ྠᵝ࡟ࡋ࡚ 7 ⰺ⥺ᮦࢆస〇ࡋࡓࠋຍᕤࡋࡓ
⥺ᮦࢆ 600-700oC ࡟࠾࠸࡚࢔ࣝࢦࣥ㞺ᅖẼୗ࡛ 1 ᫬㛫⇕ฎ⌮ࡋࡓࠋ⥺ᮦࡢ⮫⏺㟁ὶ Ic ࢆ 4.2Kࠊ☢⏺୰࡛ 4 ➃Ꮚ᢬ᢠἲ࡟ࡼࡾ ᐃࡋࡓࠋస〇ࡋࡓ⥺ᮦࡢ⤌⧊ࡣගᏛ㢧ᚤ㙾(OM)࠾ࡼࡧ㉮ᰝ㟁Ꮚ㢧ᚤ㙾㸦SEM㸧࡛ほᐹࡋࡓࠋMgB2
඘ሸ⋡ࡢホ౯࡜ࡋ࡚ࠊ⇕ฎ⌮ᚋࡢ MgB2 ࢥ࢔ࡢ◳ࡉࢆࣅࢵ࣮࢝ࢫ◳ࡉヨ㦂ჾ࡟ࡼࡾㄪ࡭ࡓࠋ ⤖ᯝ࡜⪃ᐹࢫ࢙࣮࢘ࢪࣥࢢຍᕤ୪ࡧ࡟⁁࣮ࣟࣝ㸩ࢲ࢖ࢫຍᕤࡋࡓ
⇕ฎ⌮ᚋࡢᶓ᩿㠃⤌⧊ࢆ Fig.1 ࡟ࠊ㛗ᡭ᪉ྥࡢ᩿㠃⤌⧊ࢆ
Fig. 2 ࡟ẚ㍑ࡋ࡚♧ࡍࠋᶓ᩿㠃࡟࠾࠸࡚ࡣࠊ࠸ࡎࢀࡶ MgB2
ࣇ࢕࣓ࣛࣥࢺࡣ୙つ๎࡞ᙧ≧ࢆࡋ࡚࠾ࡾࠊࡇࢀࡣࢫ࢙࣮࢘
ࢪຍᕤࡋࡓ༢ⰺ⥺ᮦ࡟࠾࠸࡚ࡣ෇≧ࡢࣇ࢕࣓ࣛࣥࢺ᩿㠃ᵓ㐀ࡀᚓࡽࢀࡿⅬ࡛␗࡞ࡗ࡚࠸ࡿࠋࡋ࠿ࡋ࡞ࡀࡽ⥺ᮦ㛗ᡭ᪉ྥ࡛ࡣࠊࢫ࢙࣮࢘ࢪຍᕤࡋࡓ⥺ᮦ࡛ࡣ Mg ⢏ࡣ⣽㛗࠸ࣇ࢕࣓ࣛࣥࢺ≧࡟ຍᕤࡉࢀࡿࡇ࡜࡟ᑐᛂࡋ࡚ࠊࣇ࢕࣓ࣛࣥࢺ
≧ࡢ MgB2 ࡀᚓࡽࢀ࡚࠾ࡾࠊ༢ⰺ⥺ᮦ࡜ྠᵝࡢ⤖ᯝࡀᚓࡽࢀࡓࠋ⁁࣮ࣟࣝ㸩ࢲ࢖ࢫຍᕤ࡟࠾࠸࡚ࡶ Mg ⢏ࡣከᑡࡣ⣽㛗ࡃຍᕤࡉࢀࠊࣇ࢕࣓ࣛࣥࢺ≧ࡢ MgB2 ࡀᚓࡽࢀࡿࡀࠊࣇ
࢕࣓ࣛࣥࢺ⤌⧊ࡣ᫂ࡽ࠿࡟ࢫ࢙࣮࢘ࢪຍᕤࡋࡓ⥺ᮦࡢ᪉ࡀ⁁࣮ࣟࣝ㸩ࢲ࢖ࢫ⥺ᘬࡼࡾࡶඃࢀ࡚࠸ࡿࡇ࡜ࡀࢃ࠿ࡿࠋ
ࡲࡓࠊࢫ࢙࣮࢘ࢪຍᕤ࡞ࡽࡧ࡟⁁࣮ࣟࣝ㸩ࢲ࢖ࢫ⥺ᘬࡋࡓ
B(CCB)⥺ᮦࡢ MgB2 ࢥ࢔ࡢࣅࢵ࣮࢝ࢫ◳ࡉࡣࠊࡑࢀࡒࢀ
ᖹᆒ್࡛ 303ࠊ198 ࡛࠶ࡾࠊࢫ࢙࣮࢘ࢪຍᕤ࡟ࡼࡗ࡚ࡣࡿ
࠿࡟㧗࠸ࣅࢵ࣮࢝ࢫ◳ࡉࡀᚓࡽࢀࡓࠋࡇࢀࡣࠊࢫ࢙࣮࢘ࢪ
ຍᕤ࡟ࡼࡗ࡚ MgB2 ࢥ࢔ࡢ㧗࠸඘ሸ⋡ࡀᚓࡽࢀࡿࡇ࡜ࢆ
♧ࡋ࡚࠸ࡿࠋ
Fig. 3 ࡟ࡣ௒ᅇࡢᐇ㦂࡛స〇ࡋࡓ MgB2 ⥺ᮦࡢ 4.2K ࡟࠾ࡅࡿ Jc-B ≉ᛶࢆ♧ࡍࠋ࣮࢝࣎ࣥࢥ࣮ࢺࡋࡓ B ⢊ᮎࡢሙྜࡣ 600oC ࡛ࠊࡲࡓ C24H12 ῧຍࡋࡓሙྜࡣ 700oC ࡛᭱ࡶ㧗
࠸ Jc ࡀᚓࡽࢀࡓࠋ୧⪅࡜ࡶ࡟⁁࣮ࣟࣝ㸩ࢲ࢖ࢫ⥺ᘬ࡟ẚ࡭࡚ࢫ࢙࣮࢘ࢪຍᕤ࡟ࡼࡗ࡚ࡣࡿ࠿࡟㧗࠸ Jc ࡢᚓࡽࢀࡿ
ࡇ࡜ࡀࢃ࠿ࡿࠋC24H12 ῧຍࡋࡓ⥺ᮦࡢ Jc ࡣ࣮࢝࣎ࣥࢥ࣮ࢺ
B ⢊ᮎࢆ⏝࠸࡚స〇ࡋࡓ⥺ᮦࡼࡾࡶప࠸ࡀࠊࡇࢀࡣ⇕ฎ⌮

ᗘࡀ 700oC ࡜㧗ࡃࠊ⤖ᬗ⢏ࡢ⢒኱໬ࡀ㐍ࡴࡓࡵ࡜⪃࠼ࡽࢀࡿࠋࡇࢀࡽࡢ⤖ᯝࡣ༢ⰺ⥺ᮦ࡜ྠᵝ࡛࠶ࡾࠊࢫ࢙࣮࢘ࢪ
ࣥࢢ࡟ࡼࡿ⥺ᮦຍᕤࡀከⰺ⥺ᮦ࡟ᑐࡋ࡚ࡶ᭷ຠ࡛࠶ࡿࡇ
࡜ࡀࢃ࠿ࡗࡓࠋ
ㅮ₇࡛ࡣࠊᑡࡋ኱ࡁ࡞ᚄࡢࣅࣞࢵࢺ࠿ࡽฟⓎࡋ࡚ࢫ࢙࢘
࣮ࢪࣥࢢ࡟ࡼࡿ⥺ᮦຍᕤ⋡ࢆୖࡆࡓሙྜࡢ⤖ᯝ࡟ࡘ࠸࡚
ࡶሗ࿌ࡍࡿࠋ

Fig. 1 Transverse cross sections of 7-filamentary MgB2 wires
cold worked with swaging(left) and groove rolling and roller
drawing(right). The wires were heat treated at 600oC for 1 hr.

Fig. 2 Longitudinal cross sections of 7-filamentary MgB2 wires
cold worked with swaging(left) and groove rolling and roller
drawing(right). The wires were heat treated at 600oC for 1 hr.

4.2K

Fig. 3 Jc-B curves at 4.2K of 7-filamentary MgB2 wires cold
worked with swaging and groove rolling + roller drawing. 4.5%
carbon coated B(CCB) and 5%C24H12 added B were used.
ㅰ㎡ ᮏ◊✲ࡣ JST ඛ➃ⓗపⅣ⣲໬ᢏ⾡㛤Ⓨ஦ᴗ㸦ALCA㸧ࡢຓᡂࢆཷࡅ࡚ᐇ᪋ࡋࡓࡶࡢ࡛࠶ࡿࠋ

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3C-a10

MgB2 (2)☢ᛶࢩ࣮ࢫ MgB2 ከⰺ⥺ᮦ࡟࠾ࡅࡿᒁᡤ⮫⏺㟁ὶศᕸࡢ㠀◚ቯホ౯࡟㛵ࡍࡿ᳨ウ
Nondestructive Characterization of Local Critical Current Distribution in
MgB2 Multi-filamentary Wire with Magnetic Sheathᆓᆅ㻌 ಟᖹ㻘㻌 䝰䝝䞁㻌 䝅䝱䝮㻘㻌 ᮾᕝ㻌 ⏥ᖹ㻘㻌 ஭ୖ㻌 ᫀ╬䠄஑኱䠅㻧㻌㕥ᮌ㻌 Ꮥ᫂㻘㻌 す㻌 ࿴ஓ㻘㻌 ඣ⋢㻌 ୍᐀㻘㻌 ⏣୰㻌 ⚽ᶞ䠄᪥❧〇సᡤ䠅㻧㻌 ᮌ㡲㻌 㝯ᬸ㻌 䠄஑኱䠅㻌
BOCHI Shuhei, MOHAN Shyam, HIGASHIKAWA Kohei, INOUE Masayoshi (Kyushu Univ.);SUZUKI Takaaki, NISHI Kazuya, KODAMA Motomune, TANAKA Hideki (Hitachi Ltd.); KISS Takanobu (Kyushu Univ.)
E-mail: s.bouchi@super.ees.kyushu-u.ac.jp(a)(b)
Fig. 1. Photographs of the sample: (a) the cross section [1], and(b) a 10-mm-long piece for the measurement.

Fig. 2. Experimental results on magnetic micrographs at 5 K
D ZLWKH[WHUQDOPDJQHWLFILHOGKLVWRU\RIĺ7 E ZLWK0ĺ7DQG F WKHdifference between (a) and (b).
H[SHULPHQWDOYDOXHWKHRUHWLFDOYDOXH

60
50

Magnetic field Bz (mT)㻝㻚㻌 䛿䛨䜑䛻㻌⌧ᅾᛂ⏝࡟ྥࡅ࡚㛗ᑻࡢ MgB2 ⥺ᮦࡢ◊✲ࡀ┒ࢇ࡟⾜ࢃࢀ࡚࠸ࡿࠋ㛗ᑻࡢ MgB2 ⥺ᮦࡢ≉ᛶࡣᒁᡤ≉ᛶపୗ㒊࡟ࡼࡾไ㝈ࡉࢀࡿࡓࡵࠊᒁᡤⓗ࡞≉ᛶࡢホ౯ࡀᚲせ࡜ࡉࢀࡿࠋࡲࡓࠊ㛗ᑻ⥺ᮦࡢရ㉁⟶⌮ࡲ࡛⪃࠼ࡓሙྜ࡟ࡣࠊ㠀◚ቯⓗ࡞ホ౯ᢏ⾡ࡢ☜❧ࡀ୙ྍḞ࡜࡞ࡾࠊ☢Ẽⓗ࡞ᡭἲࡣࡑࡢೃ⿵࡜ࡋ࡚ᣲࡆࡽࢀࡿࠋࡋ࠿ࡋࠊ⌧ᅾၟ⏝ࡢ MgB2
⥺ᮦࡣ୺࡟☢ᛶࢩ࣮ࢫࢆ᭷ࡋ࡚࠸ࡿࡓࡵࠊ☢Ẽⓗᡭἲ࡛ࡣ≉ᛶࡢホ౯ࡀᅔ㞴࡛࠶ࡗࡓࠋࡑࡇ࡛ᡃࠎࡣࠊ☢ᛶࢩ࣮ࢫᮦࡢ㣬࿴☢ሙ㡿ᇦࢆ฼⏝ࡋࡓᡭἲࢆᥦ᱌ࡋ࡚࠾ࡾࠊ᪤
࡟༢ⰺ⥺ᮦࡢᒁᡤ⮫⏺㟁ὶศᕸࡢホ౯࡟ᡂຌࡋ࡚࠸ࡿࠋ
ࡑࡇ࡛ᮏ◊✲࡛ࡣࠊၟ⏝࡛ࡣ୍⯡ⓗ࡜࡞ࡿከⰺ⥺ᮦ࡟ࡘ࠸࡚ࠊᮏᡭἲࡢ㐺⏝ྍ⬟ᛶࢆ᳨ドࡋࡓࠋ㻞㻚㻌 ᪉ἲ㻌ホ౯ᑐ㇟࡜ࡋࡓヨᩱࡣࠊin-situ PIT ἲ࡟ࡼࡗ࡚స〇ࡉࢀ
ࡓ MgB210 ⰺ⥺࡛࠶ࡾࠊFig. 1(a)࡟ࡑࡢ᩿㠃ᅗࢆ♧ࡍࠋࡇࡢ⥺ᮦࡣ㕲ࡸࣔࢿࣝ࡜࠸ࡗࡓ☢ᛶయࢆࢩ࣮ࢫ࡜ࡋ࡚᭷ࡋ
࡚࠸ࡿࠋ10 mm 㛗ࡢ⥺ᮦࢆ㉮ᰝᆺ࣮࣍ࣝ⣲Ꮚ☢Ẽ㢧ᚤ㙾ࢩࢫࢸ࣒ࡢ෭༷ࢫࢸ࣮ࢪ࡟ Fig. 1(b)ࡢࡼ࠺࡟タ⨨ࡋࠊእ㒊☢⏺ࢆ༳ຍࡋࡓ㝿ࡢ⥺ᮦ⾲㠃ࡢ☢⏺ศᕸࢆ ᐃࡋࡓࠋᚓ
ࡽࢀࡓ☢⏺ศᕸࢆ෌⌧ࡍࡿࣇ࢕࣓ࣛࣥࢺࡢ⮫⏺㟁ὶᐦᗘ
Jc ࢆࣇ࢕ࢵࢸ࢕ࣥࢢࣃ࣓࣮ࣛࢱ࡜ࡍࡿࡇ࡜࡛ࠊ⥺ᮦࡢ⮫⏺
㟁ὶࢆホ౯ࡋࡓࠋ㻟㻚㻌 ⤖ᯝ䞉⪃ᐹ㻌
Fig. 2 ࡟ヨᩱ ᗘ 5 K ࡟࠾࠸࡚እ㒊☢⏺ 3 T ࢆ༳ຍࡋࡓ
㝿࡟ᚓࡽࢀࡓ☢Ẽീࢆ♧ࡍࠋῶ☢᫬࡜ቑ☢᫬ࡢ⤖ᯝࢆ♧ࡋ࡚࠸ࡿࡀࠊቑ☢᫬࡟࠾࠸࡚ࡶ⥺ᮦ㒊ࡢ☢⏺ᙉᗘࡀ㧗࠸ࡓࡵࠊࡇࡢ☢Ẽീࡢ኱㒊ศࡣ☢ᛶࢩ࣮ࢫࡢᙳ㡪࡟ࡼࡿࡶࡢ࡛࠶ࡿࡓࡵࡇࡢࡲࡲ࡛ࡣ㉸ఏᑟࣇ࢕࣓ࣛࣥࢺ⏤᮶ࡢ☢
Ẽಙྕࡢほᐹࡀᅔ㞴࡛࠶ࡿࠋୖグእ㒊☢⏺ᙉᗘ࡟࠾࠸࡚
☢ᛶయࡣ㣬࿴ࡋ࡚࠸ࡿࡢ࡛ࠊ㉸ఏᑟࣇ࢕࣓ࣛࣥࢺࡢ☢໬ࡀ཯㌿ࡋ࡚࠸ࡿ୧⪅ࡢᕪศࢆྲྀࡿࡇ࡜࡛☢ᛶࢩ࣮ࢫ࡟ࡼ
ࡿᙳ㡪ࢆ㝖ࡍࡿࡇ࡜ࡀ࡛ࡁࡿࠋࡼࡗ࡚ᕪศ࡟ࡼࡿ☢Ẽീ
Fig. 2(c)ᅗࡣ㉸ఏᑟࣇ࢕࣓ࣛࣥࢺ⏤᮶ࡢ☢⏺ศᕸ࡜࡞ࡾࠊ
ࡇࢀ࡟ࡼࡾࡇࡢ⥺ᮦࡣᆒ୍࡞≉ᛶࢆ᭷ࡋ࡚࠸ࡿࡇ࡜ࡀศ
࠿ࡿࠋFig. 3 ࡟♧ࡍᵝ࡟ࠊ⥺ᮦ┤ୖ࡟࠾ࡅࡿᖜ᪉ྥࡢ☢⏺
ศᕸࢆ⌮ㄽゎᯒ࡜ẚ㍑ࡋࠊࣇ࢕࣓ࣛࣥࢺࡢ Jc ࢆࣇ࢕ࢵࢸ
࢕ࣥࢢࣃ࣓࣮ࣛࢱ࡜ࡋ࡚Ỵᐃࡋࡓࠋ⌮ㄽゎᯒ࡟࠾࠸࡚ࠊ
ྛࣇ࢕࣓ࣛࣥࢺࡢ Jc ࡣ➼ࡋ࠸࡜௬ᐃࡋࠊࣇ࢕࣓ࣛࣥࢺࡢ
ࢧ࢖ࢬ࡞ࡽࡧ࡟఩⨨ࡣヨᩱࡢ᩿㠃ほᐹࡢ⤖ᯝࢆࡶ࡜࡟Ỵᐃࡋࡓࠋࡇࡢ⤖ᯝ࠿ࡽ⥺ᮦࡢ⮫⏺㟁ὶࢆồࡵࠊᅄ➃Ꮚἲࡢ ᐃ⤖ᯝ࡜ẚ㍑ࡋࡓࡶࡢࢆ Fig. 4 ࡟♧ࡍࠋ୧⪅࡟ࡣᐃ㔞ⓗ࡟Ⰻ࠸୍⮴ࡀぢࡽࢀࠊࡇࡢ⤖ᯝࡣᮏゎᯒࡢጇᙜᛶࢆ♧ࡋ࡚࠸ࡿࠋࡉࡽ࡟ࠊᅄ➃Ꮚἲ࡛ࡣホ౯ࡢᅔ㞴࡞㧗࠸⮫⏺
㟁ὶ್ࢆ᭷ࡍࡿ㡿ᇦࡶホ౯࡛ࡁࡿࡇ࡜ࡀࢃ࠿ࡿࠋ௨ୖ࡟
ࡼࡾࠊၟ⏝⥺ᮦࡢホ౯࡟࠾࠸࡚୙ྍḞ࡜࡞ࡿ☢ᛶࢩ࣮ࢫ࡜ከⰺᵓ㐀࡬ࡢᑐᛂࡀྍ⬟࡜࡞ࡾࠊᮏᡭἲࡣ MgB2 ⥺ᮦࡢ㠀◚ቯရ㉁ホ౯ࡢᇶ┙ᢏ⾡࡟࡞ࡿࡶࡢ࡜ᮇᚅ࡛ࡁࡿࠋཧ⪃ᩥ⊩㻌[1] H. Tanaka et al.: IEEE Transactions on Applied
Superconductivity, 27 (2017) 4600904.

40
30
20
10
0

-10
-1.5

-1

-0.5

0

0.5

Width position x (mm)11.5

Fig. 3. Comparison of magnetic field distributions in width
direction at a longitudinal position between the experimental
and analytical results.

Fig. 4. Comparison of the estimated critical current value withthat by the four-probe method.

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第95回

2017年度秋季低温工学・超電導学会

3C-a11

MgB2 (2)㧗ᐦᗘ 㻹㼓㻮㻞 ⥺䛻䛚䛡䜛ᶵᲔⓗ㈇Ⲵ⪏ᛶ䛾ᐇ㦂ⓗ᳨ウ㻌㻱㼤㼜㼑㼞㼕㼙㼑㼚㼠㼍㼘㻌㼟㼠㼡㼐㼥㻌㼛㼒㻌㼠㼛㼘㼑㼞㼍㼚㼏㼑㻌㼠㼛㻌㼙㼑㼏㼔㼍㼚㼕㼏㼍㼘㻌㼘㼛㼍㼐㻌㼛㼚㻌㼐㼑㼚㼟㼑㻌㻹㼓㻮㻞㻌㼣㼕㼞㼑㻌

0.5 ȝ9(1 ȝ9/cm)

Voltage㻌⏣୰⚽ᶞ䠈㕥ᮌᏕ᫂䠈ඣ⋢୍᐀䠈ᑠ℧༤ྖ㻌 䠄᪥❧〇సᡤ䠅㻌㼀㻭㻺㻭㻷㻭㻌㻴㼕㼐㼑㼗㼕䠈㻿㼁㼆㼁㻷㻵㻌㼀㼍㼗㼍㼍㼗㼕㻘㻌㻷㻻㻰㻭㻹㻭㻌㻹㼛㼠㼛㼙㼡㼚㼑㻘㻌㻷㻻㼀㻭㻷㻵㻌㻴㼕㼞㼛㼟㼔㼕㻌㻔㻴㼕㼠㼍㼏㼔㼕㻘㻌㻸㼠㼐㻚㻕㻌㻱㻙㼙㼍㼕㼘㻦㻌㼔㼕㼐㼑㼗㼕㻚㼠㼍㼚㼍㼗㼍㻚㼏㼖㻬㼔㼕㼠㼍㼏㼔㼕㻚㼏㼛㼙㻌㻌㻝䠊䛿䛨䜑䛻㻌ㅰ㎡㻌ᮏ◊✲䛾୍㒊䛿䠈⛉Ꮫᢏ⾡᣺⯆ᶵᵓ䠄JST䠅䛻䜘䜛ඛ➃ⓗప㻹㼓㻮㻞 ⥺ᮦ䛿ᾮయ䝦䝸䜴䝮䜢ᚲせ䛸䛧䛺䛔୰ 㻔㻞㻜㻷 ๓ᚋ㻕䛷Ⅳ⣲໬ᢏ⾡㛤Ⓨ䠄ALCA䠅䛾ᨭ᥼䜢ཷ䛡䛶⾜䜟䜜䛯䚹౑⏝ྍ⬟䛺㉸㟁ᑟ⥺ᮦ䛸䛧䛶ᮇᚅ䛥䜜䛶䛔䜛䛜䠈☢ሙ୰ 㻶㼏 ≉ᛶ䛻ᨵၿ䛾వᆅ䛜䛒䜛䚹䜎䛯䠈㻹㼓㻮㻞 䜈䛾↝ᡂ཯ᛂᚋ䛻䝁䜲䝹ཧ⪃ᩥ⊩㻌≧䛻ᕳ⥺䛩䜛 㻾㼑㼍㼏㼠㻌㻒㻌㼃㼕㼚㼐 ἲ䛻䛶䝁䜲䝹䜢స〇䛩䜛ሙྜ䠈⥺㻝㻚㻌 㻳㻚㻌 㻺㼕㼟㼔㼕㼖㼕㼙㼍㻌 㼑㼠㻌 㼍㼘㻌 㻿㼡㼜㼑㼞㼏㼛㼚㼐㻚㻌 㻿㼏㼕㻚㻌 㼀㼑㼏㼔㼚㼛㼘㻚㻌 㻞㻡㻌 㻔㻞㻜㻝㻞㻕㻌ᮦ䛾 㻵㼏 ຎ໬䜢㑊䛡䜛䛯䜑䛻䠈㻵㼏 䛾ᙇຊ㻛᭤䛢䜂䛪䜏౫Ꮡᛶ䜢㻜㻡㻠㻜㻝㻞㻚㻌
ᢕᥱ䛧䛶䛚䛟䛣䛸䛜㔜せ䛷䛒䜛䚹ඛ⾜◊✲䛻䛚䛔䛶䠈㻹㼓㻮㻞 ⥺㻞㻚㻌 㻹㻚㻌 㻷㼛㼐㼍㼙㼍㻌 㼑㼠㻌 㼍㼘㻌 㻿㼡㼜㼑㼞㼏㼛㼚㼐㻚㻌 㻿㼏㼕㻚㻌 㼀㼑㼏㼔㼚㼛㼘㻚㻌 㻟㻜㻌 㻔㻞㻜㻝㻣㻕㻌ᮦ䛾෭༷୰䛾䜂䛪䜏౫Ꮡᛶ䛿ከᩘሗ࿌䛥䜜䛶䛔䜛㼇౛䛘䜀䠍㼉㻜㻠㻠㻜㻜㻢㻚㻌䛜䠈ᐊ 䛷༳ຍ䛧䛯䜂䛪䜏䛻ᑐ䛩䜛᳨ウ䛿ከ䛟䛺䛔䚹䛭䛣䛷㻟㻚㻌 㻼㻚㻌㻷㼛㼢㽬㾘㻌㼑㼠㻌㼍㼘㻌㻿㼡㼜㼑㼞㼏㼛㼚㼐㻚㻌㻿㼏㼕㻚㻌㼀㼑㼏㼔㼚㼛㼘㻚㻌㻞㻞㻢㻌㻔㻞㻜㻝㻟㻕㻌㻝㻜㻡㻜㻞㻤㻚ᮏ◊✲䛷䛿䠈୍⯡ⓗ䛺 㻵㼚㻙㼟㼕㼠㼡㻌㻼㻵㼀 ἲ䛷స〇䛧䛯 㻹㼓㻮㻞 ⥺ᮦ䛸䠈ᡃ䚻䛜ᥦ᱌䛧䛶䛔䜛㧗ᐦᗘ 㻹㼓㻮㻞 ⥺ᮦ㼇㻞㼉䛸䜢ᑐ㇟䛻䠈ᐊ 䛷
4.2 K, 7 T
In-situ PIT
H T = 0.22%༳ຍ䛧䛯ᘬᙇ䜚㻛᭤䛢䜂䛪䜏䛸 㻵㼏 䛸䛾㛵ಀ䜢ᐇ㦂ⓗ䛻᳨ウ䛧H T = 0.19 %䛯䚹㻌㻌㻞䠊ᐇ㦂᪉ἲ㻌㻵㼚㻙㼟㼕㼠㼡㻌㻼㻵㼀 ⥺䛸䠈㧗ᐦᗘ 㻼㻵㼀 ⥺䛾䠎✀㢮䛾 㻹㼓㻮㻞 ⥺ᮦ䛻ᑐ䛧䛶䠈ᐊ ୰䛷ᶵᲔ㈇Ⲵ䜢༳ຍ䛧䛯ᚋ䛻䠈㝖Ⲵ䛧䛶䛛䜙 㻵㼏 ≉H T = 0.17 %ᛶ䜢 ᐃ䛧䛯䚹ᘬᙇ䜚㈇Ⲵ༳ຍ䛻䛿䠈䜸䞊䝖䜾䝷䝣䠄ᓥὠ〇సᡤ䠈㻭㻳㻙㻝㻜㻜㼗㻺㼄㼜㼘㼡㼟䠅䜢⏝䛔䛯䚹䛭䛾㝿䠈⥺ᮦ୧➃䛾䝏䝱䝑䜽H T = 0.11 %㛫㊥㞳䜢 㻡㻜㻌 㼙㼙 䛸䛧䛯䚹ᘬᙇ䜚ຊ䜢ቑຍ䛥䛫䛴䛴⥺ᮦ䛻㈞䜚
௜䛡䛯䜂䛪䜏䝀䞊䝆䠄㻲㻮㼅㻙㻜㻢䠈ᮾி ჾ◊✲ᡤ䠅䛾ᛂ⟅䜢
0
100
200
300
400
500
Current, I (A)ほ 䛧䛯䚹᭤䛢㈇Ⲵ༳ຍ䛻䛿䠈እᚄ䛾␗䛺䜛」ᩘ䛾䝪䝡䞁䜢Fig.1 I-V curves on tensioned sample wires. H T means the⏝䛔䛯䚹᭤䛢ᅇᩘ䛿䠏ᅇ䛷䛒䜚䠈᭤䛢㈇Ⲵ䛾༳ຍ䛸㝖Ⲵ䛾⧞tensile strain at RT measured by strain gages.
䜚㏉䛧୰䛻⥺ᮦ䛾఩┦䛜ኚ໬䛧䛺䛔䜘䛖䠈⥺ᮦ➃㒊䜢䝪䝡䞁䛻In-situ PIT

4.2 K, 7 T

H B = 0.28%

0.5 ȝ9(1 ȝ9/cm)

Voltage

H B = 0.22%

H B = 0.19%
H B = 0.18%
0

100

200
300
Current, I (A)

400

500

Fig.2 I-V curves on bended sample wires.H B means thebending strain calculated by H B = rF / (rB + rW), where rF is theradius of the outer circle of the filament area as shown in theinsertion of Figure 3, and rB is the outer radius of the bobbin
used for wire bending and rW is the radius of the wire.
60

In-situ PIT

1.1

50

1

40

0.9

30

0.8

20

0.7

10

0.6

n-value

1.2

Ic/Ic0ᅛᐃ䛧䠈ᅛᐃ➃䛛䜙௚➃䛻ྥ䛛䛳䛶⥺䜢䝪䝡䞁䛻ἢ䜟䛫䜛䛣䛸䛷ᡤᮃ䛾᭤䛢㈇Ⲵ䜢୚䛘䛯䚹Ic ᐃ䛿㟁ᅽ䝍䝑䝥㛫㊥㞳䜢㻡㻌㼙㼙 䛸䛧䛶䠈୍⯡ⓗ䛺ᅄ➃Ꮚἲ䜢⏝䛔䛶ᐇ᪋䛧䛯䚹㻌㻌㻟䠊⤖ᯝ㻌㻲㼕㼓㻚㻝 䛻䠈ᐊ 䛷ᘬᙇ䜚㈇Ⲵ䜢༳ຍ䞉㝖Ⲵ䛧䛯 㻵㼚㻙㼟㼕㼠㼡㻌 㻼㻵㼀⥺䠄⥺ᚄ 㻝㻚㻡㻌 㼙㼙䠅䛻ᑐ䛩䜛䠈ᾮయ䝦䝸䜴䝮෭༷୰䛷䛾 㻵㼏 ᐃ䛻䛚䛡䜛㟁ὶ㟁ᅽ᭤⥺䜢♧䛩䚹ᐊ 䛷ຍ䛘䛯ᘬᙇ䜚䜂䛪䜏㻌
H T㻌㻩㻌㻜㻚㻝㻣㻑䛸 㻜㻚㻝㻥㻑䛾㛫䛷䠈㟁⏺ᇶ‽ 㻝㻌㼡㼂㻛㼏㼙 䛻ᇶ䛵䛟 㻵㼏 䛾పୗ䜢☜ㄆ䛧䛯䚹䜎䛯䠈H T㻌㻩㻌㻜㻚㻝㻥㻑䛻䛚䛔䛶䛿䠈㟁ὶᤲ༳㏵୰䛛䜙㟁ὶ㟁ᅽ᭤⥺䛻䛚䛡䜛䝜䜲䝈ⓗ䛺Ἴᙧ䜢ほ 䛧䛯䚹䛣䜜䛿㒊ศⓗ䛻ຎ໬䛧䛯䝣䜱䝷䝯䞁䝖䛸䛛䜙೺඲䛺䝣䜱䝷䝯䞁䝖䜈䛾㟁ὶ䛾ศ㓄䛻㉳ᅉ䛩䜛䛸᥎ 䛧䛶䛔䜛䚹㻌㻲㼕㼓㻚㻞 䛻᭤䛢㈇Ⲵ䜢༳ຍ䞉㝖Ⲵ䛧䛯ሙྜ䛾 ᐃ⤖ᯝ䜢♧䛩䚹᭤䛢䜂䛪䜏H B㻌㻩㻌㻜㻚㻝㻥㻑䛸 㻜㻚㻞㻞㻑䛾㛫䛷䠈㟁⏺ᇶ‽ 㻝㻌㼡㼂㻛㼏㼙 䛻ᇶ䛵䛟 㻵㼏 䛿పୗ䛧䛶䛚䜚䠈䛥䜙䛻H B㻌㻩㻌㻜㻚㻞㻞㻑䛾⥺ᮦ䛻䛚䛔䛶䝜䜲䝈ⓗ䛺Ἴᙧ䜢ྲྀᚓ䛧䛯䚹㻲㼕㼓㻚㻟 䛻ྠヨ㦂⤖ᯝ䛛䜙ᚓ䛯 㻵㼏䠄᭤䛢䛺䛧䝃䞁䝥䝹䛷つ᱁໬䠅䛸 㼚 ್䛾᭤䛢䜂䛪䜏౫Ꮡᛶ䜢♧䛩䚹᭤䛢䜂䛪䜏 㻜㻚㻝㻥㻑䛾⥺ᮦ䛿䠈㻵㼏 䛾್䛿᭤䛢↓䛧⥺ᮦ䛸ẚ䜉䛶㻝㻟㻑⛬ᗘ㧗䛔䛜䠈㼚 ್䛜పୗ䛧ጞ䜑䛶䛚䜚䠈䛣䜜䛿䝣䜱䝷䝯䞁䝖䛜ᒁᡤⓗ䛻യ䜣䛷䛔䜛䛣䛸䜢♧၀䛧䛶䛔䜛䚹㻌䛣䛾䜘䛖䛻䠈ᮏሗ࿌䛷⏝䛔䛯 㻵㼚㻙㼟㼕㼠㼡㻌 㻼㻵㼀 ἲ䛷స〇䛧䛯㻹㼓㻮㻞 ⥺ᮦ䛿䠈ᐊ 䛷䛾ᶵᲔⓗ㈇Ⲵ䛻ᑐ䛧䛶 㻜㻚㻝㻤㻑䡚㻜㻚㻝㻥㻑䛾ᘬᙇ䜚䞉᭤䛢䜂䛪䜏䛷䠈䝣䜱䝷䝯䞁䝖䛾୍㒊䛜ຎ໬䛩䜛䛣䛸䛜᫂䜙䛛䛸䛺䛳䛯䚹㧗ᐦᗘ 㻹㼓㻮㻞 ⥺ᮦ䛻䛚䛡䜛䜂䛪䜏⪏ᛶ≉ᛶ䛿ᙜ᪥ྜ䜟䛫䛶ሗ࿌䛩䜛䚹䜎䛯䠈㻹㼓㻮㻞 ⥺ᮦ䛾䜂䛪䜏⪏ᛶ䛿䠈⇕ฎ⌮᮲௳䛻䜒౫Ꮡ䛩䜛䛸䛔䛖ሗ࿌㼇㻟㼉䛜䛒䜚䠈⇕ฎ⌮᮲௳䛻ᑐ䛩䜛᳨ウ䛿௒ᚋ䛾ㄢ㢟䛷䛒䜛䚹㻌
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Bending strain of filaments, H B (%)

Fig.3 Bending strain dependence of Ic and n-value on bended
sample wires. Ic0 means the Ic of non-bended wire andn-values were measured at E = 10-5–10-4 V/m.

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第95回

2017年度秋季低温工学・超電導学会

3C-a12

MgB2 (2)⇕ฎ⌮๓䛾᭤䛢ṍ䛜 㻹㼓㻮㻞 ⣲⥺䛾⮫⏺㟁ὶ䛻ཬ䜌䛩ᙳ㡪㻌㻵㼚㼒㼘㼡㼑㼚㼏㼑㻌㼛㼒㻌㼎㼑㼚㼐㼕㼚㼓㻌㼟㼠㼞㼍㼕㼚㻌㼎㼑㼒㼛㼞㼑㻌㼔㼑㼍㼠㻌㼠㼞㼑㼍㼠㼙㼑㼚㼠㻌㼛㼚㻌㼏㼞㼕㼠㼕㼏㼍㼘㻌㼏㼡㼞㼞㼑㼚㼠㻌㼛㼒㻌㻹㼓㻮㻞㻌㻌ୖᯘ㻌 ᫀᘯ䠈Ỉⴠ㻌 ✵䠈⚄ಖ㻌 ⱸ㑣䠈᱓ཎ㻌 ඃ௓䠈㧗ᑿ㻌 ᬛ᫂䠈㇂㈅㻌 ๛䠄ୖᬛ኱Ꮫ䠅䠗᪂෠㻌 Ꮥ࿴䠈ᵐ⏣㻌 ᗣ༤䠄㻷㻱㻷䠅䠗℈ᓥ㻌 㧗ኴ㑻䠈㥖㎸㻌 ᩄᘯ䠈ሯ⏣㻌 ㅬ୍䠄๓ᕝ〇సᡤ䠅䠗ᖹ㔝㻌 ┤ᶞ䠄୰㒊㟁ຊ䠅䠗ᐩ⏣㻌 ඃ䠈ᜠᆅ㻌 ኴ⣖䠄㕲㐨⥲ྜ◊✲ᡤ䠅䠗㻌㻷㼍㼙㼕㼎㼍㼥㼍㼟㼔㼕㻌㻹㼍㼟㼍㼔㼕㼞㼛䠈㻌 㻹㼕㼦㼡㼛㼏㼔㼕㻌㻿㼛㼞㼍䠈㻌 㻶㼕㼙㼎㼛㻌㻹㼍㼚㼍䠈㻌 㻷㼡㼣㼍㼎㼍㼞㼍㻌㼅㼡㼟㼡㼗㼑䠈㻌 㼀㼍㼗㼍㼛㻌㼀㼛㼙㼛㼍㼗㼕䠈㻌 㼅㼍㼓㼍㼕㻌㼀㼟㼡㼥㼛㼟㼔㼕㻌㻔㻿㼛㼜㼔㼕㼍㻌㼁㼚㼕㼢㻚㻕㻧㻌㻿㼔㼕㼚㼠㼛㼙㼕㻌㼀㼍㼗㼍㼗㼍㼦㼡䠈㻌 㻹㼍㼗㼕㼐㼍㻌㼅㼍㼟㼡㼔㼕㼞㼛㻌㻔㻷㻱㻷㻕㻌㻧㻌㻴㼍㼙㼍㼖㼕㼙㼍㻌㼀㼍㼗㼍㼠㼍㼞㼛䠈㻌 㻷㼛㼙㼍㼓㼛㼙㼑㻌㼀㼛㼟㼔㼕㼔㼕㼞㼛䠈㻌 㼀㼟㼡㼗㼍㼐㼍㻌㻷㼑㼚㼕㼏㼔㼕㻌㻔㻹㼍㼥㼑㼗㼍㼣㼍㻌㻹㻲㻳㻚㻌㻯㼛㻚㻘㻌㻸㼀㻰㻚㻕㻌㻧㻌㻴㼕㼞㼍㼚㼛㻌㻺㼍㼛㼗㼕㻌 㻌 㻔㻯㼔㼡㼎㼡㻌㻱㼘㼑㼏㼠㼞㼕㼏㻌㻼㼛㼣㼑㼞㻌㻯㼛㻚㻘㻌㻵㼚㼏㻚㻕㻌㻧㻌㼀㼛㼙㼕㼠㼍㻌㻹㼍㼟㼍㼞㼡䠈㻌 㻻㼚㼖㼕㻌㼀㼍㼕㼗㼕㻌㻔㻾㼀㻾㻵㻕㻌㻱㻙㼙㼍㼕㼘㻦㻌㼙㼟㼗㼙㻞㻟㻡㻣㻝㻝㻬㼓㼙㼍㼕㼘㻚㼏㼛㼙㻌㻌㻡䠊 ᐃ⤖ᯝ㻌㻝䠊䛿䛨䜑䛻㻌
㻜㼀㻘㻌 㻞㻥㻌 㻷 䛻䛚䛡䜛 ᐃ⤖ᯝ䜢 㻲㼕㼓㻚㻌 㻞 䛻♧䛩䚹䝇䝖䝺䞊䝖䛾㻹㼓㻮㻞 ⥺䛿䠈⮫⏺ ᗘ 㻟㻥㻌㻷 䛷䛒䜚䠈Ᏻ౯䛷㈨※䛜㇏ᐩ䛷䛒䝃䞁䝥䝹䛾⮫⏺㟁ὶ䜢 㻝㻜㻜㻑䛸䛧䠈᭱እᒙ䝣䜱䝷䝯䞁䝖䛻䛛䛛䜛䜛䛣䛸䛛䜙䠈䜶䝛䝹䜼䞊㈓ⶶ⿦⨨⏝䛾䝁䜲䝹䛺䛹ᑗ᮶䛾ᐇ⏝㻞㻘㻌㻟㻘㻌㻠㻘㻌㻡㻑䛾᭤䛢ṍ䜢ຍ䛘䛯䝃䞁䝥䝹䛾つ᱁໬⮫⏺㟁ὶ䛿䠈໬䛜ᮇᚅ䛥䜜䛶䛔䜛䚹䜎䛯䠈㉸㟁ᑟᛂ⏝ᶵჾ䛻฼⏝䛩䜛䛯䜑䛭䜜䛮䜜 㻥㻤㻘㻌㻤㻟㻘㻌㻣㻥㻘㻌㻠㻤㻑䛸䛺䛳䛯䚹㻴㼥㼜㼑㼞㻌㼀㼑㼏㼔 ♫䛾බ⾲䛩䜛䛻䛿䠈᧍⥺స〇䛻䜘䜛኱ᐜ㔞໬䜒ᚲせ䛸䛺䜛䚹䛧䛛䛧䠈䝁䜲䝹チᐜ᭤䛢ṍ 㻠㻑䜎䛷䛿኱䛝䛺ຎ໬䛜䜏䜙䜜䛺䛛䛳䛯䛜䠈㻡㻑䛷኱䜔᧍⥺స〇䛾㝿䠈᭤䛢ṍ䛻䜘䜛⣲⥺䛾ຎ໬䛜ᠱᛕ䛥䜜䜛䚹䛭䛝䛺ຎ໬䛜䜏䜙䜜䛯䚹㻌䛣䛷䠈䝣䜱䝷䝯䞁䝖䛻䛛䛛䜛⇕ฎ⌮๓䛾ṍ䜏⋡䜢ኚ䛘䛯䝃䞁䝥㻢䠊䜎䛸䜑㻌
䝹䜢స〇䛧䠈⮫⏺㟁ὶ䛾ኚ໬䜢 ᐃ䛩䜛䛣䛸䛷䠈⮫⏺㟁ὶ㻙ṍ㻹㼓㻮㻞 ⥺䛻⇕ฎ⌮๓䛻ṍ䜢ຍ䛘䠈⮫⏺㟁ὶ䜢 ᐃ䛩䜛䛣䛸䜏⋡≉ᛶ䛾ㄪᰝ䜢⾜䛳䛯䚹㻌㻞䠊ຍ䛘䛯᭤䛢ṍ㻌䛷≉ᛶ䛜ຎ໬䛩䜛䛛䛹䛖䛛䜢ㄪᰝ䛧䛯䚹䛭䛾⤖ᯝ䠈ຍ䛘䛯ṍ㻴㼥㼜㼑㼞㻌 㼀㼑㼏㼔 ♫䛾බ⾲䛩䜛⇕ฎ⌮๓䛾チᐜ᭤䛢ṍ䛿 㻠㻑䛷䛜኱䛝䛟䛺䜛䛸⮫⏺㟁ὶ䛾ຎ໬䜒኱䛝䛟䛺䛳䛯䚹䜎䛯䠈㻡㻑䛾᭤䛒䜚䠈ᮏᐇ㦂䛷䛿䝇䝖䝺䞊䝖⥺䛸᭱እᒙ䝣䜱䝷䝯䞁䝖䛻䛛䛛䜛ṍ䛢ṍ䜢ຍ䛘䛯᫬䛻 㻵㼏 䛜ᛴ⃭䛻ຎ໬䛧䛯䚹௨ୖ䛾⤖ᯝ䛛䜙䠈᧍䜏⋡䛜 㻞䡚㻡㻑䛾䝃䞁䝥䝹䜢⏝ព䛧䛯䚹䝇䝖䝺䞊䝖⥺䛿 㻤㻡㻌 㼙㼙㻘㻌⥺᫬䜔䝁䜲䝹ᕳ䛝⥺ຍᕤ᫬䛻䠈⇕ฎ⌮๓䛾ṍ䜏䛜 㻠㻑௨ୗ䛻ṍ䜢ຍ䛘䛯䝃䞁䝥䝹䛿䠈᭤䛢ṍ䜏㒊䜢 㻝㻡㻌㼙㼙 䛻ᅛᐃ䛧䠈᭤⋡䛺䜛䜘䛖䛻ไᚚ䛩䜛ᚲせ䛜䛒䜛䚹㻌༙ᚄ䛸୰ᚰゅ䜢Ỵ䜑䛯䚹㻲㼕㼓㻚㻌 㻝 䜢ཧ↷䛧䚸⣲⥺䛾୰ᚰ䛛䜙᭱㻌እᒙ䝣䜱䝷䝯䞁䝖䜎䛷䛾㊥㞳䜢 㼞㼇㼙㼙㼉䠈᭤⋡༙ᚄ䜢 䃠㼇㼙㼙㼉䛸䛧䛯᫬䛾⥺䛻ຍ䜟䜛᭤䛢ṍ 䃔 䛿ḟᘧ䛾䜘䛖䛻⾲䛥䜜䜛䚹㻌㻌㻌 㼞㻌 䛿ಶ䚻䛾䝣䜱䝷䝯䞁䝖䛾఩⨨䛻䜘䛳䛶ⱝᖸ䛾䜀䜙䛴䛝䛜䛒䜛䛜䠈ᖹᆒ䛩䜛䛸 㻜㻚㻟㻌㼙㼙 䛷䛒䛳䛯䚹䜘䛳䛶䠈ୖ䛾ᘧ䛻䛚䛔䛶㼞㻌㻩㻌㻜㻚㻟㻌 䛸䛧䠈䃔䜢 㻞䡚㻡㻑䜎䛷ኚ໬䛥䛫䜛䛣䛸䛷᭤⋡༙ᚄ䃠䜢⟬ฟ䛧䛯䚹⏝ព䛧䛯䝃䞁䝥䝹䛾䝟䝷䝯䞊䝍䜢 㼀㼍㼎㼘㼑㻌㻝 䛻♧䛩䚹㻌㼀㼍㼎㼘㼑㻌㻝㻚㻌㻮㼑㼚㼐㼕㼚㼓㻌㼟㼠㼞㼍㼕㼚㻌㼍㼚㼐㻌㼏㼡㼞㼢㼍㼠㼡㼞㼑㻌㼞㼍㼐㼕㼡㼟㻌㻌㻌㻮㼑㼚㼐㼕㼚㼓㻌
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㻭㼚㼓㼘㼑㼇㼐㼑㼓㼞㼑㼑㼉㻌㻲㼕㼓㻚㻌㻝㻚㻌㻿㼠㼞㼍㼚㼐㻌㼏㼛㼚㼐㼕㼠㼕㼛㼚㻌㼣㼔㼑㼚㻌㼟㼠㼞㼍㼕㼚㻌㼣㼍㼟㻌㼍㼜㼜㼘㼕㼑㼐㻚㻌

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㻝㻠㻟㻌

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㻟䠊㻌 䝃䞁䝥䝹స〇㻌䝃䞁䝥䝹䛻䛿 㻴㼥㼜㼑㼞㻌 㼀㼑㼏㼔 ♫〇䛾 㻹㼓㻮㻞 ⥺ᮦ䠄⥺ᚄ 㻜㻚㻤㻟㻌㼙㼙䠈㻟㻜 䝣䜱䝷䝯䞁䝖䠈䝣䜱䝷䝯䞁䝖༨᭷⋡ 㻞㻜㻑䠈䝰䝛䝹⿕そ䠅䜢౑⏝䛧䛯㼇㻝㼉䚹ಶ䚻䛾䝃䞁䝥䝹䛾᭤⋡䛻ἢ䛳䛯⁁ຍᕤ䜢᪋䛧䛯㻿㼁㻿 ᯈ䜢⏝ព䛧䠈⁁䛻 㻹㼓㻮㻞 ⥺䜢ῧ䜟䛫䛶ᅛᐃ䛧䛯䚹㻵㼏 ᇶ‽䛸䛺䜛䝇䝖䝺䞊䝖⥺䛸䠈㻿㼁㻿 ᯈ䛻ᅛᐃ䛧䛯䝃䞁䝥䝹䜢ྠ᫬䛻⇕ฎ⌮䛧䛯䚹㻌㻠䠊 ᐃ᮲௳㻌㻠 ➃Ꮚἲ䛻䜘䜚䠈䛭䜜䛮䜜䛾䝃䞁䝥䝹䜈䛾㏻㟁䜢⾜䛳䛯䚹⏝ព䛥䜜䛯 㻳㻲㻾㻼 䛾䝩䝹䝎䛻䛿䠈䝃䞁䝥䝹䜢஌䛫䜛䛯䜑䛾⁁ຍᕤ䚸ཬ䜃䛭䛾୰ኸ௜㏆┤ୗ䛻䚸䝉䝹䝜䝑䜽䝇 ᗘ䝉䞁䝃⏝䛾῝䛔⁁䛜᪋䛥䜜䛯䚹⁁䛻タ⨨䛥䜜䛯䝃䞁䝥䝹䛿䜾䝸䞊䝇䛷ᇙ䜑䜙䜜䚸䝉䝹䝜䝑䜽䝇 ᗘ䝉䞁䝃䛿䝃䞁䝥䝹䛸䜹䝥䝖䞁䝔䞊䝥䜢ᣳ䜣䛷㞄᥋䛧䛶䛔䛯䚹እ㒊☢ሙ䛿 㻜㼀 䛷䛒䜚䠈෭෾ᶵ䛻䜘䜛ఏᑟ෭༷䛷䝃䞁䝥䝹䛾タᐃ ᗘ䛿 㻞㻥㻌 㻷 䛸䛧䛯䚹 ᐃ༊㛫䛿䠈䝇䝖䝺䞊䝖⥺䛿୰ኸ䛾 㻠㻜㻌㼙㼙㻘㻌 ᭤䛢ṍ䜢ຍ䛘䛯䝃䞁䝥䝹䛿᭤䛢㒊ศ䛾 㻝㻡㻌㼙㼙 䛷䛒䜚䠈㻵㼏 ᇶ‽䛿 㻝䃛㼂㻌㻛㻌㼏㼙 䛷䛒䛳䛯䚹㻌㻌㻲㼕㼓㻚㻌㻞㻚㻌㻺㼛㼞㼙㼍㼘㼕㼦㼑㼐㻌㼏㼞㼕㼠㼕㼏㼍㼘㻌㼏㼡㼞㼞㼑㼚㼠㼟㻌㼍㼠㻌㻞㻥㻌㻷㻘㻌㻜㼀㻌㻌ཧ⪃ᩥ⊩㻌㻝㻚㻌 㻹㻚㻌 㼀㼛㼙㼟㼕㼏㻌 㼑㼠㻌 㼍㼘㻚㻌 㻦㻌 䇾㻰㼑㼢㼑㼘㼛㼜㼙㼑㼚㼠㻌 㼛㼒㻌 㼙㼍㼓㼚㼑㼟㼕㼡㼙㻌 㼐㼕㼎㼛㼞㼕㼐㼑㻌㻔㻹㼓㻮㻞㻕㻌㼣㼕㼞㼑㼟㻌㼍㼚㼐㻌㼙㼍㼓㼚㼑㼠㼟㻌㼡㼟㼕㼚㼓㻌㼕㼚㻌㼟㼕㼠㼡㻌㼟㼠㼞㼍㼚㼐㻌㼒㼍㼎㼞㼕㼏㼍㼠㼕㼛㼚㻌㼙㼑㼠㼔㼛㼐㻘䇿㻌㻼㼔㼥㼟㼕㼏㼍㻌㻯㻘㻌㼢㼛㼘㻚㻌㻠㻡㻢㻘㻌㻞㻜㻜㻣㻘㻌㼜㼜㻚㻌㻞㻜㻟㻙㻞㻜㻤㻚㻌㻌

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2017年度秋季低温工学・超電導学会

3C-p01㻮㼕㻞㻞㻞㻟 ⥺ᮦ䛻ᑐ䛩䜛ຍᅽ 㻝 ḟ↝ᡂຠᯝ㻌

Bi 系線材㻱㼒㼒㼑㼏㼠㻌㼛㼒㻌㼛㼢㼑㼞㻌㼜㼞㼑㼟㼟㼡㼞㼑㻌㼛㼚㻌㻝㼟㼠㻌㼟㼕㼚㼠㼑㼞㼕㼚㼓㻌㼜㼞㼛㼏㼑㼟㼟㻌㼛㼒㻌㻮㼕㻞㻞㻞㻟㻌㼠㼍㼜㼑㼟㻌㻌ᑠụ㻌 㑈㻘㻌 ⏣୰㻌 ᬛஅ㻘㻌 ඖᮌ㻌 ㈗๎㻘㻌 ୗᒣ㻌 ῟୍㻌 㻔㟷Ꮫ኱㻕㻧㻌 Ṋ⏣㻌 Ὀ᫂㻌 㻔ᮾ኱㝔ᕤ㻕㻧㻌୰ᓥ㻌 㝯ⰾ㻘㻌 ᑠᯘ㻌 ៅ୍㻘㻌 ຍ⸨㻌 Ṋᚿ㻌 㻔ఫ཭㟁ᕤ㻕㻌
KOIKE Ryo, TANAKA Tomoyuki, MOTOKI Takanori, SHIMOYAMA Jun-ichi (Aoyama Gakuin Univ.);
TAKEDA Yasuaki (The Univ. of Tokyo);
NAKASHIMA Takayoshi, KOBAYASHI Shin-ichi, KATO Takeshi (Sumitomo Electric Industries)
E-mail: c5617049@aoyama.jp
㻌
㻝㻚

䛿䛨䜑䛻
⌧ᅾࠊBi2223 ⥺ᮦ(DI-BSCCO®)ࡣ┦⏕ᡂࢆ┠ⓗ࡜ࡋࡓ኱Ẽᅽ 1 ḟ↝ᡂ(PO2 ~ 8 kPa, ~840°C, ~100 h)࡜ࠊ⦓ᐦ໬ࠊ㓄ྥᗘᙉ໬ࢆ┠ⓗ࡜ࡋࡓ࣮ࣟࣝᅽᘏ࠾ࡼࡧ⤖ᬗᡂ㛗࡟క࠺✵㝽Ⓨ⏕ࢆᢚไࡍࡿຍᅽ㞺ᅖẼୗ࡛ࡢ 2 ḟ↝ᡂ(Ptotal = 30
MPa, PO2 ~ 8 kPa, ~840°C, ~100 h)࡟ࡼࡾ〇㐀ࡉࢀ࡚࠾ࡾ[1]ࠊ
㛗ᑻ㔞⏘⥺ᮦࡢ Ic (77 K)ࡣ 200 A ࡟㐩ࡋ࡚࠸ࡿ[2]ࠋ୍᪉ࠊ
ᡃࠎࡣࡇࢀࡲ࡛࡟ PO2 < 5 kPa ࡛ࡢ↝ᡂࡀ Bi2223 ┦ࡢ⏕ᡂࢆ㏿ࡸ࠿࡟ࡍࡿࡇ࡜ࢆሗ࿌ࡋ࡚ࡁࡓ[3]ࠋࡑࡇ࡛ᮏ◊✲ࡣ㧗 Ic ⥺ᮦࡢస〇ࣉࣟࢭࢫ▷⦰ࢆ┠ⓗ࡜ࡋ࡚ࠊBi2223 ⥺ᮦ࡟ᑐࡍࡿప PO2 ୗ࡛ࡢຍᅽ 1 ḟ↝ᡂࡀ┦⏕ᡂ࠾ࡼࡧ㉸ఏᑟ≉ᛶ࡟୚࠼ࡿᙳ㡪ࢆㄪ࡭࡚࠸ࡿࠋ

ࡣᚤ⣽⤌⧊࠾ࡼࡧ㔠ᒓ⤌ᡂ࡜㉸ఏᑟ≉ᛶࡢ㛵ಀ࡟ࡘ࠸࡚
ࡶ㆟ㄽࡍࡿࠋ

㻞㻚ᐇ㦂᪉ἲ㻌
㏻ᖖࡢ㖟ࢩ࣮ࢫ 1 ḟᅽᘏࢸ࣮ࣉ࡟ᑐࡋ࡚ᵝࠎ࡞඲࢞ࢫᅽୗ (Ptotal = 0.1–30 MPa)࡛ 1 ḟ↝ᡂࡢࡳࢆ⾜࠸ Bi2223 ⥺ᮦࢆస〇ࡋࡓࠋ↝ᡂ ᗘࡣ Bi2223 ┦ࡢ⏕ᡂࡀ᭱ࡶ㏿ࡸ࠿࡞ 825°C ࡜ࡋࡓࠋຍᅽ↝ᡂ࡟ࡣ O2-Dr. HIP ࢆ⏝࠸ࠊ825°C
࡛ࡢ㓟⣲ศᅽࡣ 3 kPa ࡟ᅛᐃࡋࡓࠋ୍㒊ࡢヨᩱ࡟ࡣ㔠ᒓ⤌ᡂไᚚࢆ┠ⓗ࡜ࡋࡓ PO2 = 500 Pa, 760°C, 48 h ࡢ㑏ඖ࣏ࢫࢺ࢔ࢽ࣮ࣝࢆ᪋ࡋࠊヨᩱࡢ㓟⣲㔞ࡣ✵Ẽ୰ 600°C ࠿ࡽࡢᛴ෭࡟ࡼࡾ࢟ࣕࣜ࢔ࡢ᭱㐺ࢻ࣮ࣉ≧ែ࡜࡞ࡿࡼ࠺࡟ไᚚࡋ
ࡓࠋヨᩱࡢᚤ⣽⤌⧊࠾ࡼࡧᒁᡤ⤌ᡂࡣ EPMA ࡟ࡼࡾࠊᵓ
ᡂ┦࠾ࡼࡧ c ㍈㛗ࡣ⾲㠃 XRD ࠿ࡽホ౯ࡋࡓࠋ㉸ఏᑟ≉ᛶࡣ SQUID ☢᮰ィࢆ⏝࠸ࡓ☢໬ ᐃࠊᅄ➃Ꮚἲ࡟ࡼࡿ㏻㟁
ᐃࡼࡾㄪ࡭ࡓࠋ☢໬ ᐃ࡟࠾࠸࡚ࡣ☢ሙࢆ⥺ᮦ⾲㠃࡟ᆶ┤࡟༳ຍࡋࡓࠋ
⤖ᯝ䛸⪃ᐹ㻌XRD ࣃࢱ࣮ࣥࡢ 2T ~ 33.8°ࡢ 0014 (Bi2223)ࣆ࣮ࢡ࡜
~35.0°ࡢ 0012 (Bi2212)ࢆ⏝࠸࡚⟬ฟࡋࡓ Bi2223 ⏕ᡂ๭ྜࡢ↝ᡂ᫬㛫࣭඲ᅽ౫Ꮡᛶࢆ Fig. 1 ࡟♧ࡍࠋ඲ᅽࡢቑຍ࡟క
࠸ࠊBi2223 ┦⏕ᡂࡢ཯ᛂ㏿ᗘࡀపୗࡋ࡚࠸ࡿࡇ࡜ࡀࢃ࠿
ࡿࠋ㏻ᖖࠊBi2223 ┦⏕ᡂ᫬࡟ࡣయ✚ࡢቑຍࡀぢࡽࢀࠊ኱Ẽᅽୗ࡛ࡢ 1 ḟ↝ᡂ࡟ࡼࡗ࡚⥺ᮦࡢཌࡉࡀ~5%ቑຍࡍࡿࠋ
୍᪉ࠊຍᅽ㞺ᅖẼୗ࡛ 1 ḟ↝ᡂࢆ⾜ࡗࡓ⥺ᮦࡢཌࡉࡢቑຍ
ࡣ 1-3%࡟␃ࡲࡾࠊ኱Ẽᅽୗ࡛స〇ࡋࡓヨᩱ࡜ẚ㍑ࡋ࡚ᑠ
ࡉ࠿ࡗࡓࠋࡇࡢࡇ࡜ࡣࠊຍᅽ࡟ࡼࡗ࡚↝ᡂ୰ࡢయ✚ቑຍࡢᢚไࠊࡘࡲࡾ⤖ᬗ㛫ࡢ✵㝽Ⓨ⏕ࡢᢚไࡀࠊ2223 ┦ࡢ⏕ᡂࢆ㐜ࡃࡍࡿࡇ࡜ࢆ♧၀ࡍࡿ⤖ᯝ࡛࠶ࡿࠋ㏫࡟ຍᅽ 1 ḟ↝ᡂ࡛ࡶࣇ࢕࣓ࣛࣥࢺࡢ㧗ᐦᗘ໬࡟ࡼࡿ Ic ࡢྥୖࡀᮇᚅ࡛ࡁ
ࡿࠋຍᅽ 1 ḟ↝ᡂࡋࡓヨᩱࡣ ZFC ☢໬ࡢ ᗘ౫Ꮡᛶ࡟࠾
࠸࡚ࡼࡾ㗦࠸㉸ఏᑟ㌿⛣ࢆ♧ࡋࠊࡇࢀࡣ㧗ᐦᗘ໬࡟⏤᮶ࡋࡓ⢏㛫⤖ྜࡢᨵၿࢆព࿡ࡋ࡚࠸ࡿࠋ
Fig. 2 ࡟ᵝࠎ࡞඲ᅽୗ࡛┦⏕ᡂࡋࡓ Bi2223 ࡢ c ㍈㛗ࡢ඲ᅽ౫Ꮡᛶࢆ♧ࡍࠋ↝ᡂ᫬ࡢ඲ᅽࡀ㧗࠸࡯࡝ c ㍈㛗ࡀ▷ࡃ࡞ࡿഴྥࡀㄆࡵࡽࢀࠊᶆ‽ⓗ࡞ Bi2223 ⥺ᮦ(c = 37.08~37.10
Å)ࡼࡾ▷ࡃ࡞ࡿࡇ࡜ࡀࢃ࠿ࡗࡓࠋc ㍈㛗ࡢ▷⦰ࡣ Sr ࢧ࢖
ࢺ࡬ࡢ Ca, Bi ᅛ⁐ࡸ Bi ࢧ࢖ࢺ࡬ࡢ Pb ᅛ⁐㔞ࡢቑຍࢆ♧၀ࡋ࡚࠾ࡾࠊຍᅽ㞺ᅖẼ࡛ࡢ┦⏕ᡂࡣᅛ⁐ࢆಁ㐍ࡍࡿࡇ࡜ࡀ
⪃࠼ࡽࢀࡿࠋࡇࢀࡲ࡛ࡢ࡜ࡇࢁࠊຍᅽ 1 ḟ↝ᡂ࡟ࡼࡗ࡚స
〇ࡋࡓ⥺ᮦࡢ Ic ࡣ኱Ẽᅽୗ࡛స〇ࡋࡓヨᩱࡼࡾప࠸ࡀࠊࡇ
ࢀ࡟ࡣ㔠ᒓ⤌ᡂࡢ㐪࠸ࡀᙳ㡪ࡋ࡚࠸ࡿྍ⬟ᛶࡀ㧗࠸ࠋᙜ᪥

Fig. 1 Dependence of X-ray peak intensity ratio of
Bi2223 on Ptotal and sintering time.

㻟㻚Fig. 2 Ptotal dependence of c-axis length of Bi2223.
ཧ⪃ᩥ⊩㻌[1] K. Sato, S. Kobayashi, T. Nakashima, Jpn. J. Appl. Phys. 51(2012).
[2] T. Nakashima, S. Kobayashi, T. Kagiyama, M. Kikuchi, S.
Yamade, K. Hayashi, K. Sato, G. Osabe, J. Fujikami,
Cryogenics 52 (2012) 713–718.
[3] R.Tajima, J. Shimoya, A. Yamamoto, H. Ogino, K. Kishio,
T. Nakashima, S. Kobayashi, K. Hayashi, IEEE Trans. Appl.
Supercond. 23 (2013)― 182 ―

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2017年度秋季低温工学・超電導学会

3C-p02

Bi 系線材㧗ᙉᗘ 㻰㻵㻙㻮㻿㻯㻯㻻 ⥺ᮦ䛾ᐇ⏝໬㛤Ⓨ㻌㻼㼞㼍㼏㼠㼕㼏㼍㼘㻌 㼐㼑㼢㼑㼘㼛㼜㼙㼑㼚㼠㻌㼛㼒㻌㻰㻵㻙㻮㻿㻯㻯㻻㻌㼣㼕㼞㼑㻌㼣㼕㼠㼔㻌㼔㼕㼓㼔㻌㼟㼠㼞㼑㼚㼓㼠㼔㻌ᒣฟ㻌 ဴ䠈㛗㒊㻌 ࿃㑻㻘㻌 ᒣ㷂㻌 ᾈᖹ㻘㻌 ⳥ᆅ㻌 ᫀᚿ㻘㻌 ୰ᓥ㻌 㝯ⰾ㻘㻌 Ṋ⏣㻌 ᐀୍㑻㻘㻌 ᒸ⏣㻌 ᭸அ㻘㻌 ஧ᮌ㻌 ೺ኴ㻘㻌 ᑠᯘ㻌 ៅ୍㻘㻌 ᯘ㻌 ࿴ᙪ㻘㻌ຍ⸨㻌 Ṋᚿ䠄ఫ཭㟁ᕤ䠅䠗㻌 㛗ᮧ㻌 ග㐀䠄ᛂ⏝⛉Ꮫ◊䠅䠗㻌 ➟ሙ㻌 Ꮥ୍䠄ᐩᒣ኱Ꮫ䠅㻌㼅㻭㻹㻭㻰㻱㻌㻿㼍㼠㼛㼞㼡㻘㻌㻻㻿㻭㻮㻱㻌㻳㼛㼞㼛㻘㻌㼅㻭㻹㻭㼆㻭㻷㻵㻌㻷㼛㼔㼑㼕㻘㻌㻷㻵㻷㼁㻯㻴㻵㻌㻹㼍㼟㼍㼟㼔㼕㻘㻌㻺㻭㻷㻭㻿㻴㻵㻹㻭㻌㼀㼍㼗㼍㼥㼛㼟㼔㼕㻘㻌㼀㻭㻷㻱㻰㻭㻌㻿㼛㼕㼏㼔㼕㼞㼛㻘㻌 㻌㻻㻷㻭㻰㻭㻌㼀㼛㼙㼛㼥㼡㼗㼕㻘㻌㻺㻵㻷㻵㻌㻷㼑㼚㼠㼍㻘㻌㻷㻻㻮㻭㼅㻭㻿㻴㻵㻌㻿㼔㼕㼚㻙㼕㼏㼔㼕㻘㻌㻴㻭㼅㻭㻿㻴㻵㻌㻷㼍㼦㼡㼔㼕㼗㼛㻘㻌 㻌㻷㻭㼀㻻㻌㼀㼍㼗㼑㼟㼔㼕㻔㻿㼡㼙㼕㼠㼛㼙㼛㻌㻱㼘㼑㼏㼠㼞㼕㼏㻌㻵㼚㼐㼡㼟㼠㼞㼕㼑㼟㻘㻌㻸㼀㻰㻚㻕䠗㻌 㻻㻿㻭㻹㼁㻾㻭㻌㻷㼛㼦㼛㻔㻾㻵㻭㻿㻕䠗㻌 㻷㻭㻿㻭㻮㻭㻌㻷㼛㼕㼏㼔㼕㻔㼁㼚㼕㼢㻚㻌㼛㼒㻌㼀㼛㼥㼍㼙㼍㻕㻌㻱㻙㼙㼍㼕㼘㻦㻌㼥㼍㼙㼍㼐㼑㻙㼟㼍㼠㼛㼞㼡㻬㼟㼑㼕㻚㼏㼛㻚㼖㼜㻌 㻌㻌㻌㼀㼍㼎㼘㼑㻌㻝㻚㻌㻿㼜㼑㼏㼕㼒㼕㼏㼍㼠㼕㼛㼚㼟㻌㼛㼒㻌㼀㼥㼜㼑㻌㻴㼀㻙㻺㼄㻌㻝䠊䛿䛨䜑䛻㻌
Type HT-CA
Type HT-SS
Type HT-NX
ᙜ♫䛷䛿䚸㻝㻥㻤㻤 ᖺ䛻㻔㻮㼕㻘㻌 㻼㼎㻕㻞㻿㼞㻞㻯㼍㻞㻯㼡㻟㻻䡔䠄௨㝆 㻮㼕㻞㻞㻞㻟䠅
Average Width
4.5+/-0.1mm 4.5+/-0.1mm
4.5+/-0.2mm
䛾 ◊ ✲ 㛤 Ⓨ 䜢 㛤 ጞ 䛧 䚸 㻰㻵㻙㻮㻿㻯㻯㻻㻔㻰㼥㼚㼍㼙㼕㼏㼍㼘㼘㼥㻙㻵㼚㼚㼛㼢㼍㼠㼕㼢㼑㻌
Average Thickness
0.34+/-0.02mm 0.29+/-0.02mm 0.31+/-0.03mm
㻮㻿㻯㻯㻻㻕⥺ᮦ䛾⮫⏺㟁ὶ್䠄௨㝆 㻵㼏䠅ྥୖ䚸㧗ᙉᗘ໬㛤Ⓨ䜢
Reinforcement tape
Copper alloy Stainless steel Nickel alloy(0.02mmt)(0.03mmt)(0.05mmt)
㐍䜑䛶䛝䛯䚹㻌
170A, 180A, 190A, 200A
Ic (77K, Self Field)㻵㼏 䛾ྥୖ䛻䛚䛔䛶䛿 㻞㻜㻜㻠 ᖺ䛻ຍᅽ↝⤖⅔䜢ᑟධ䛧䚸⌧ᅾCritical Wire Tension * (RT)280N **
230N **
410N **
䜎䛷䝣䜱䝷䝯䞁䝖୰䛾 㻮㼕㻞㻞㻞㻟 䛾 㼏 ㍈㓄ྥᛶ䛾ྥୖ䚸ຍᅽ↝⤖
Critical Tensile Strength * (77K)
250 MPa **270 MPa **400 MPa **Critical Tensile Strain * (77K)
0.3% **
0.4% **
0.5% **
⅔䛷䛾 㻮㼕㻞㻞㻞㻟 ෆ䛾⢏ෆ⤌ᡂไᚚ䚸䜻䝱䝸䜰㔞ไᚚ➼䛾ᵝ䚻
Critical Bending Diameter * (RT)
60mm **
60mm **
40mm **
䛺ᑐ⟇䜢㐍䜑䛶䛝䛯䚹㻌* 95% Icretention, * * Typical Value㧗ᙉᗘ໬䛷䛿䚸㻰㻵㻙㻮㻿㻯㻯㻻 ⥺ᮦ䛾୧㠃䛻⿵ᙉᮦ䜢ᙇ䜚ྜ㻌䜟䛩༙⏣᥋ྜ䜢䛩䜛䛣䛸䛷⥺ᮦ䛾ᙉᗘྥୖ䜢㐍䜑䛶䛝䛯䚹⿵ᙉᮦ䛻㖡ྜ㔠䚸䝇䝔䞁䝺䝇䝇䝏䞊䝹䜢⏝䛔䛶༙⏣᥋ྜ䛧䛯㻴㼀㻙㻯㻭㻘㻌 㻴㼀㻙㻿㻿 䛿䚸㉸㟁ᑟ䜿䞊䝤䝹䜔⯪⯧⏝䝰䞊䝍䛷ᗈ䛟᥇⏝䛥䜜䛶䛔䜛䚹୍᪉䛷䚸㻞㻜 䝔䝇䝷䜢㉸䛘䜛㧗☢ሙ䝬䜾䝛䝑䝖䜔኱ཱྀᚄ䝬䜾䝛䝑䝖䛾ᛂ⏝䛷䛿䚸⥺ᮦ䛾ᘬᙇᙉᗘ䛿 㻠㻜㻜㻹㻼㼍௨ୖ䜢ᚲせ䛸䛥䜜䛶䛚䜚䚸㻞㻜㻝㻡 ᖺ䛻 㻴㼀㻙㻺㼄㻔㻺㼕 ྜ㔠㻕䜢ၟရ໬䛻ᡂຌ䛧䛯㼇㻝㼉䚹㻌㻌 㻴㼀㻙㻺㼄 䛾㛤Ⓨ䛷䛿䚸㖡ྜ㔠䜔䝇䝔䝺䞁䝇䝇䝏䞊䝹䛻ẚ䜉䛶㣕㌍ⓗ䛻㧗䛔㝆అᛂຊ䜢᭷䛩䜛 㻺㼕 ྜ㔠䜢⿵ᙉᮦ䛻⏝䛔䚸༙⏣᥋ྜ䛩䜛᫬䛻⿵ᙉᮦ䛻㧗䛔䝔䞁䝅䝵䞁䜢ຍ䛘䜛䛣䛸㼇㻞㼉䛷䚸༙⏣᥋ྜᚋ䛻ṧ␃ᅽ⦰ṍ䜏䛜ຍ䜟䜚䚸ᘬᙇṍ䜏䚸ᘬᙇᛂຊ䛻ᑐ䛧䛶ඃ䜜䛯⪏ᛶ䜢୚䛘䜛䛣䛸䛻ᡂຌ䛧䛯䚹䛭䛾⤖ᯝ䚸ᘬᙇ㻌ヨ㦂ᚋ䛾 㻵㼏 䛜ᘬᙇ๓䛸ẚ㍑䛧䛶 㻥㻡㻑䜢⥔ᣢ䛩䜛チᐜᘬᙇᛂ㻌ຊ䛿䚸㻠㻠㻟㻹㻼㼍 䛸䛺䛳䛯䚹㻌㻌 ௒ᅇ䚸㻴㼀㻙㻺㼄 䛾ㅖ≉ᛶ䚸⑂ປヨ㦂⤖ᯝ䚸ẚ᢬ᢠ䛾㧗䛔㻲㼕㼓㻚㻝㻌㼂㼍㼞㼕㼍㼠㼕㼛㼚㻌㼛㼒㻌㻵㼏㻌㼙㼑㼍㼟㼡㼞㼑㼐㻌㼍㼠㻌㼠㼔㼑㻌㼘㼛㼍㼐㼕㼚㼓㻌㼟㼠㼑㼜㻌㼍㼟㻌㻴㼀㻙㻺㼄 䛾䝇䝥䝷䜲䝇᪉ἲ䛾㛤Ⓨ䛻䛴䛔䛶ሗ࿌䛩䜛䚹㻌㼒㼡㼚㼏㼠㼕㼛㼚㻌㼛㼒㻌㼚㼡㼙㼎㼑㼞㻌㼛㼒㻌㼟㼠㼞㼑㼟㼟㻌㼏㼥㼏㼘㼑㻌㼒㼛㼞㻌㼑㼍㼏㼔㻌㼍㼜㼜㼘㼕㼑㼐㻌㼒㼍㼠㼕㼓㼡㼑㻌㻌㼟㼠㼞㼑㼟㼟㻌㼕㼚㻌㻴㼀㻙㻯㻭㻌㻞䠊㻴㼀㻙㻺㼄 䛾⥴ඖ㻌㼀㼥㼜㼑㻌㻴㼀㻙㻺㼄 䛾⥴ඖ䜢 㼀㼍㼎㼘㼑㻌㻝 䛻♧䛩䚹ᘬᙇᙉᗘ䚸チᐜ㻿㼜㼘㼕㼏㼑㻌㼟㼍㼙㼜㼘㼑㻌㻏㻭㻌᭤䛢ᚄ䛸䜒䛻 㼀㼥㼜㼑㻌㻴㼀㻙㻯㻭㻘㻌㼀㼥㼜㼑㻌㻴㼀㻙㻿㻿 䜢኱䛝䛟ୖᅇ䜛ᛶ⬟䜢᭷䛩䜛䚹㻌
㻌㻟䠊㼀㼥㼜㼑㻌㻴㼀㻙㻺㼄 䛾ᘬᙇ⑂ປ≉ᛶ㻌ᾮ య ❅ ⣲ ୰ 䛷 ⧞ 䜚 ㏉ 䛧 ㏿ ᗘ 㻟㼏㼥㼏㼘㼑㻛㼟 䛷 ⑂ ປ ヨ 㦂 䜢㻝㻜㻜㻘㻜㻜㻜 ᅇ⾜䛳䛯䚹㻵㼏 䛿 㻠 ➃Ꮚἲ䛷ヨ㦂๓䚸ྛᘬᙇᛂ⏝䛷༳Ⲵ୰䛻 㻵㼏 ᐃ䛧䚸㻵㼏 ⥔ᣢ⋡䜢⟬ฟ䛧䛯䚹ᾮయ❅⣲୰䛷䛾チᐜ㻌ᘬᙇᛂ䛜 㻠㻜㻜㻹㻼㼍 䛻ᑐ䛧䛶䚸㻝㻜㻜㻘㻜㻜㻜 ᅇ䛾⧞䜚㏉䛧ヨ㦂ᚋ䜒㻌 㻿㼜㼘㼕㼏㼑㻌㼟㼍㼙㼜㼘㼑㻌㻏㻮㻌㻟㻣㻜㻹㻼㼍㻌 䛾ᘬᙇᛂ⏝䜎䛷䛿䚸㻵㼏 ⥔ᣢ⋡䛿 㻜㻚㻥㻡㻑௨ୖ䛷䛒䛳䛯㻔㻲㼕㼓㻚㻌㻝㻕䚹㻌㻌㻠㻚㻌 䝇䝥䝷䜲䝇᪉ἲ䛾㛤Ⓨ㻌㻌 㼀㼥㼜㼑㻌 㻴㼀㻙㻺㼄 䛾⿵ᙉᮦ䛷䛒䜛䝙䝑䜿䝹ྜ㔠䛿䚸௚⿵ᙉᮦ䛻ẚ䜉䛶ẚ᢬ᢠ䛜㧗䛟䚸ྠ୍䝇䝥䝷䜲䝇㛗䛷䛿䚸㼀㼥㼜㼑㻌 㻴㼀㻙㻯㻭㻌䛾 㻞㻜 ಸ䜒㧗䛔䚹䛣䛾ㄢ㢟䜢ゎỴ䛩䜛䛯䜑䚸䝇䝥䝷䜲䝇䛾᪉ἲ䛾᳨ウ䜢㐍䜑䛶䛔䜛䚹᪉ᘧ䛸䛧䛶䛿䚸㻿㼜㼘㼕㼏㼑㻌 㻭䠄ᚑ᮶ᆺ䠅䚸㻲㼕㼓㻚㻞㻚㻌㻿㼏㼔㼑㼙㼍㼠㼕㼏㻌㼕㼘㼘㼡㼟㼠㼞㼍㼠㼕㼛㼚㼟㻌㼛㼒㻌㼟㼜㼘㼕㼏㼑㼐㻌㼟㼍㼙㼜㼘㼑㼟㻌㻿㼜㼘㼕㼏㼑㻌㻮㻔㛤Ⓨ㻕䛷䛒䜛㻔㻲㼕㼓㻚㻌㻞㻕䚹㻌㻣㻣㻷 䛻䛚䛡䜛᥋⥆᢬ᢠ䛿䚸㻿㼜㼘㼕㼏㼑㻌 㻭 䛿 㻟㻢㻝㼚䃈䛻ᑐ䛧䛶䚸㻌㻿㼜㼘㼕㼏㼑㻌㻮 䛷䛿䚸㻡㻞㼚䃈䛸䛺䜚䚸㻿㼜㼘㼕㼏㼑㻌㻭㻌 䛻ᑐ䛧䛶 㻿㼜㼘㼕㼏㼑㻌㻮 䛷䛿䚸㻌ཧ⪃ᩥ⊩㻌㻤㻢㻑పῶ䛧䛯䚹㻌㻝㻚 㻺㼍㼗㼍㼟㼔㼕㼙㼍㻘㻌㼑㼠㻚㼍㼘㻚㻌㻭㻿㻯㻞㻜㻝㻠㻘㻌㼜㼞㼑㼜㼞㼕㼚㼠㻌㻌㻞㻚 㻷㻚㼅㼍㼙㼍㼦㼍㼗㼕㻘㻌 㼑㼠㻚㼍㼘㻦㻌 㻿㼡㼜㼑㼞㼏㼛㼚㼐㻚㻌 㻿㼏㼕㻚㻌 㼀㼑㼏㼔㼚㼛㼘㻚㻘㻌 㼂㼛㼘㻌㻌㻞㻡㻔㻞㻜㻝㻞㻕㼜㻚㻜㻡㻠㻜㻝㻡㻌― 183 ―

第95回

2017年度秋季低温工学・超電導学会

3C-p03

Bi 系線材㻌 㻴㻭㻹㻼㻿㻴㻵㻾㻱㻌㻰㼍㼙㼕㼍㼚㻔㻰㼡㼞㼔㼍㼙㻌㼁㼚㼕㼢㻕㻌㻱㻙㼙㼍㼕㼘㻦㻌㼗㼛㼦㼛㼋㼛㼟㼍㼙㼡㼞㼍㻬㼞㼕㼍㼟㻚㼛㼞㻚㼖㼜㻌㻌㻌⮫⏺㟁ὶࡢྍ㏫㝈⏺ṍ࣭ᛂຊࡣ㉸㟁ᑟ⥺ᮦࢆᐇ㝿࡟౑ඛ 㐍 105 ࠾ ࡼ ࡧ 05, ࡢ 㛤 Ⓨ ࡢ ࡓ ࡵ ࡟ ࡣ ⌧ ≧ ࡢ⏝ࡍࡿ࡜ࡁࡢᏳ඲㝈⏺ࢆ♧ࡍࡶࡢ࡜ࡋ࡚㔜せ࡛࠶ࡿࠋ౛
%6&&2 ࠾ࡼࡧ 5(%&2 ࢸ࣮ࣉ⥺ᮦࢆ኱ࡁ࡞ࣇ࣮ࣉຊ࡟
࠼ࡤඛ㐍ⓗ 105 ࡛ࡣ 7 ࡢ☢ሙⓎ⏕ࡀồࡵࡽࢀ࡚࠸ࡿࡀࠊ
⪏࠼ࡿࡼ࠺࡟ࡉࡽ࡟㧗ᙉᗘ໬ࡍࡿࡇ࡜ࡀồࡵࡽࢀࡿࠋᮏ
࠶ࡿタィ࡛ࡣࣇ࣮ࣉຊࡣ 03D ࡟㐩ࡍࡿࠋ)LJ ࡟♧ࡍㅮ₇࡛ࡣ %6&&2 ࢸ࣮ࣉ࡟ࡘ࠸࡚ᶵᲔ㉸㟁ᑟ≉ᛶࢆ
ࡼ࠺࡟ %6&&2 ࢸ࣮ࣉ࡛ࡼࡾ㧗ᙉᗘ໬ࡀồࡵࡽࢀࡿࠋ
ᨵⰋࡍࡿ᪉ἲ࡟ࡘ࠸᳨࡚ウࡋࡓ⤖ᯝࢆሗ࿌ࡍࡿࠋ
800

౪ヨᩱ䛻䛿 㻿㻱㻵 䛷స〇䛥䜜䛯䠏✀㢮ࡢ 686 ཬࡧ㸯✀㢮ࡢ
1L ྜ㔠ࢸ࣮ࣉ 1; ࢆ࣑ࣛࢿ࣮ࢺࡋࡓ %6&&2 ࢸ࣮ࣉࢆ⏝࠸ࡓࠋᘬᙇᛂຊୗ࡛ࡢ⮫⏺㟁ὶ ᐃࡢࡓࡵ࡟ࢸ࣮
ࣉࢆᘬᙇヨ㦂ᶵ࡟⿦╔ࡋ⤯⦕ࡋࡓヨᩱࢢࣜࢵࣉࢆ㏻ࡋ࡚
㟁ὶࢆὶࡋࠊPP 㞳ࢀࡓ㟁ᅽࢱࢵࣉ㛫ࡢ㟁ᅽࡀ P9FP࡟࡞ࡗࡓ᫬ࢆ⮫⏺㟁ὶ࡜ࡋࡓࠋᚲせ㒊ศࢆᾮయ❅⣲࡛෭༷ࡋࡓࠋṍࡣ 1\LODV ᆺࡢఙࡧィ࡛ィ ࡋࡓࠋ ᐃࡣ౛࠼ࡤࢸ࣮ࣉ࡟ᘬᙇᛂຊ 5 03D ༳ຍࡋࡓ≧ែ࡛⮫⏺㟁ὶࢆ ᐃࡋึᮇ್࡜ࡢẚ ,F,F ࢆồࡵࡿࠋḟ࡟ᛂຊࢆࢮࣟ 5 ࡢ≧ែ࡟ᡠࡋ ᐃࡋࡓ್ࢆ ,FU,F ࡜ࡍࡿࠋ㡰ḟᛂຊࢆቑຍ
ࡉࡏ࡞ࡀࡽࡇࢀࡽ㸰ࡘࡢつ᱁໬ࡉࢀࡓ⮫⏺㟁ὶࢆ ᐃࡋࡓࠋ㻌㻌㻲㼕㼓㻚㻝 䛻 㻮㻿㻯㻯㻻㻙㻺㼄㻟㻜 䝔䞊䝥䛻䛴䛔䛶䛾 㻵㼏㻛㻵㼏㻜㻘㻌 㻵㼏㼞㻛㻵㼏㻜䛾ᘬᙇṍ౫Ꮡᛶ䜢♧䛩䚹㻵㼏㻛㻵㼏㻜 䛿ṍቑຍ䛸䛸䜒䛻ᚎ䚻䛻ῶᑡ䛧䚸㻵㼏㻛㻵㼏㻜㻩㻜㻚㻥㻡 䛷ᐃ⩏䛥䜜䜛 㻭㼞㼑㼠㻔㼞㼑㼠㼑㼚㼠㼕㼛㼚㻕䛛䜙ᛴ⃭䛻ῶᑡ䛩䜛䚹୍᪉ 㻵㼏㼞㻛㻵㼏㻜 䛿ṍ䛜ቑຍ䛧䛶䜒䜋䜌 㼡㼚㼕㼠㼥 䛾䜎䜎䛷䛒䜛䚹䛴䜎䜚ᘬᙇᛂຊ䜢䝊䝻䛾ᡠ䛧䛯䛸䛝䝔䞊䝥ෆ䛻◚᩿䛾䜘䛖䛺୙
ྍ㏫ኚᙧ䛜㉳䛣䛳䛶䛔䛺䛔䛣䛸䜢♧䛧䛶䛔䜛䚹㻵㼏㼞㻛㻵㼏㻜㻩㻜㻚㻥㻥 䛷ᐃ⩏䛥䜜䜛 㻭㼞㼑㼏㻔㼞㼑㼏㼛㼢㼑㼞㼥㻕㎶䜚䛛䜙ᛴ⃭䛻 㻵㼏㼞㻛㻵㼏㻜 䛜ῶᑡ䛩䜛䛾䛿㉸㟁ᑟ䝣䜱䝷䝯䞁䝖䛾◚᩿䛻䜘䜛䜒䛾䛷䛒䜛䚹㻌

5rec (MPa)

700

c0

,c / ,c0㻘㻌㻌,cr㻌㻛 ,

0.98

$rec

,c /,c0

0.96

$ret

0.94

0.92

BSCCO - NX30
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0

0.1

0.2

0.3

0.4

0.5

0.6

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 )LJ1RUPDOL]HG,FDQG,FUDVDIXQFWLRQRIWHQVLOHVWUDLQIRU
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%6&&2 ࢸ࣮ࣉ࡟ࡘ࠸࡚ࡢ⮫⏺㟁ὶࡢྍ㏫㝈⏺ṍ࣭ᛂຊࡀ5(%&2 ࢸ࣮ࣉࡢ⤖ᯝ࡜࡜ࡶ࡟♧ࡉࢀ࡚࠸ࡿࠋ

400

BSCCO (77 K)
REBCO (77 K)
BSCCO cal

200
100
0.1

0.2

0.3

0.4

0.5

0.6

0.7

$rec (%)

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%6&&2DQG5(%&2SUDFWLFDOZLUHV㻌
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ࣥ᫬࡟ᑟධࡉࢀࡿணṍ㸦$SUH㸧ࠊ෭༷᫬࡟Ⓨ⏕ࡍࡿ⇕ṍ㸦$W㸧ࠊ࠾ࡼࡧ㉸㟁ᑟࣇ࢕࣓ࣛࣥࢺ⮬㌟ࡢ◚᩿ṍ㸦 $VF㸧ࡢ㸱ࡘࡢせ⣲ࡢ࿴࡟࡞ࡿࠋࡇࡇ࡛࣑ࣛࢿ࣮ࢩࣙࣥࡍࡿ㔠ᒓࢸ࣮ࣉࡢ⇕⭾ᙇಀᩘ Ș ࠊࣖࣥࢢ⋡ ( ࠾ࡼࡧయ✚ศ⋡ 9I ࡜ࡋࠊᑐᛂࡍࡿ %6&&2 ࣇ࢕࣓ࣛࣥࢺࡢ್ࢆȘ( ࡜ࡋࡓ࡜ࡁ⇕ṍࡣ㏆ఝⓗ࡟ḟᘧ࡛୚࠼ࡽࢀࡿࠋ

$W #,cr /,c0

500

300

1.02

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SS 㻌― 184 ―

第95回

2017年度秋季低温工学・超電導学会

3C-p04

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― 185 ―

第95回

2017年度秋季低温工学・超電導学会

3C-p05

Bi 系線材ప㓟⣲ศᅽୗ↝ᡂ䛻䜘䜛 㻮㼕㻞㻞㻞㻟 ཌ⭷ᮦᩱ䛾㛤Ⓨ㻌
Development of Bi2223 thick film materials by sintering under low PO2 atmospheresṊ⏣ Ὀ᫂ (ᮾ኱㝔ᕤ) ; ⏣୰ ᬛஅ, ᑠụ 㑈, ඖᮌ ㈗๎䠈ୗᒣ ῟୍ (㟷Ꮫ኱) ;୰ᓥ 㝯ⰾ䠈ᑠᯘ ៅ୍䠈ຍ⸨ Ṋᚿ (ఫ཭㟁ᕤ)
TAKEDA Yasuaki (The Univ. of Tokyo) ;TANAKA Tomoyuki, KOIKE Ryo, MOTOKI Takanori, SHIMOYAMA Jun-ichi (Aoyama gakuin Univ.) ;NAKASHIMA Takayoshi, KOBAYASHI Shin-ichi, KATO Takeshi (Sumitomo Electric Industries)
E-mail: ytakeda@g.ecc.u-tokyo.ac.jp㻝䠊䛿䛨䜑䛻㻌
䛣䜜䜎䛷ᡃ䚻䛿 Bi2-xPbxSr2Ca2Cu3Oy [Bi2223] ከ⤖ᬗᮦᩱ䛻䛚䛡䜛⮫⏺㟁ὶ≉ᛶ䛾ᨵၿ䛻ྥ䛡䛯⢏㛫⤖ྜᙉ໬ᡭἲ䜢㆟ㄽ䛧䛶䛝䛯[1]䚹᭱㏆䛷䛿⌮᝿ⓗ䛺㧗ᐦᗘ䞉c ㍈㓄ྥ⤌⧊䛾ᙧᡂ䛜ྍ⬟䛺ཌ⭷ᮦᩱ䛻ὀ┠䛧䛶䛚䜚䚸๓ᅇ䛾ᮏᏛ఍[2]䛷
䛿䚸Bi2212 䜢୺┦䛸䛩䜛๓㥑య⢊ᮎ䛻 Bi2223 ୺┦䛾⢊ᮎ䜢
2 ๭⛬ᗘΰྜ䛩䜛䛣䛸䛷䚸⌮᝿ⓗ䛺㓄ྥ⤌⧊䜢᭷䛧䛯㧗 Jc ཌ⭷ᮦᩱ䛜స〇䛷䛝䜛䛣䛸䜢ሗ࿌䛧䛯䚹௒ᅇ䛿 Pb ⨨᥮㔞䛜
Bi2223 ከ⤖ᬗ䛾㉸ఏᑟ≉ᛶ䞉⢏㛫⤖ྜ䛻୚䛘䜛ᙳ㡪䜢᫂䜙䛛䛻䛩䜛䛣䛸䜢┠ⓗ䛸䛧䚸Pb ⨨᥮㔞䛾␗䛺䜛 Bi2223 ↝⤖య䞉ཌ⭷ヨᩱ䜢స〇䛧䚸䛭䜜䜙䛾㉸ఏᑟ≉ᛶ䜔໬Ꮫ⤌ᡂ䛺䛹䜢ㄪ䜉䛯䚹㻞䠊ᐇ㦂᪉ἲ㻌↝⤖యヨᩱ䛿䚸Bi2O3, SrCO3 䛺䛹䛾㓟໬≀䚸Ⅳ㓟ሷ䛾ཎᩱ䛛䜙䚸Bi: Pb: Sr: Ca: Cu = 2.05-x: x: 1.9: 2.0: 3.0 (x =0.35-0.55)䛾௙㎸⤌ᡂ䛷⛗㔞䚸ΰྜ䛧䚸✵Ẽ୰ 780°C 䛷௬↝䚸䝨䝺䝑䝖ᡂᆺᚋ䛻 PO2 = 1-3 kPa ୗ(1-3% O2/Ar Ẽὶ୰)䛷↝ᡂ䛩䜛䛣䛸䛻䜘䜚స〇䛧䛯䚹ཌ⭷ヨᩱ䛾స〇䛻䛚䛔䛶䛿䚸䜎䛪 Bi2212 䛺䛹䛾๓㥑య䛛䜙䛺䜛⢊ᮎ (x ~ 0.35) 䛻ᑐ䛧䛶䚸ୖグ䛾 Bi2223 䜢୺┦䛸䛩䜛↝⤖య(x ~ 0.35-0.55) 䜢䜘䛟⢊○䛧䛯⢊ᮎ䜢䝰䝹ẚ䛷 2 ๭ΰྜ䛧䛯䚹䛣䛾⢊ᮎ䜢᭷ᶵ⁐፹䚸䝞䜲䞁䝎䞊䛺䛹䛸䛸䜒䛻~50 h 䝪䞊䝹䝭䝹ΰྜ䛩䜛䛣䛸䛷䝇䝷䝸䞊䜢ㄪ〇䛧䚸䝗䜽䝍䞊䝤䝺䞊䝗ἲ䛻䜘䛳䛶ཌ䛥⣙ 400 Pm 䛾䜾䝸䞊䞁䝔䞊䝥䛸䛧䛯䚹䛣䜜䜢✵Ẽ୰
䛷 500°C 䜎䛷᪼ 䛩䜛䛣䛸䛻䜘䜚᭷ᶵ≀䜢ศゎ䛧䛯ᚋ䚸Ag ⟩䛷ᣳ䜏䚸⦓ᐦ໬䛚䜘䜃 c ㍈㓄ྥᗘᙉ໬䛾䛯䜑䛾୍㍈䝥䝺䝇(1GPa)䛸⇕ฎ⌮䜢⾜䛖䛣䛸䛷 Bi2223 ཌ⭷ヨᩱ (x ~ 0.35-0.39,~40 Pmt) 䜢స〇䛧䛯䚹↝ᡂ䛿 PO2 = 3 kPa ୗ䛷⾜䛔䚸୍㒊䛾ヨᩱ䛻ᑐ䛧䛶䛿 PO2 = 500 Pa 䛷䛾㔠ᒓ⤌ᡂไᚚ䜢┠ⓗ䛸䛧䛯㑏ඖ䝫䝇䝖䜰䝙䞊䝹䜢᪋䛧䛯䚹ヨᩱ䛾㓟⣲㔞䛿㓟⣲Ẽὶ୰
300°C 䛷䛾䜰䝙䞊䝹䛻䜘䜚䜻䝱䝸䜰⃰ᗘ䛜ᙅ䛔䜸䞊䝞䞊䝗䞊䝥≧ែ䛻䛺䜛䜘䛖䛻ไᚚ䛧䛯䚹ヨᩱ䛾ᚤ⣽⤌⧊䛿 SEM 䛻䜘䜚ほᐹ䛧䚸ᵓᡂ┦䞉᱁Ꮚᐃᩘ䛿 XRD 䛻䜘䜚ホ౯䛧䛯䚹໬Ꮫ⤌ᡂศᯒ䛿ヨᩱ◊☻㠃䛻ᑐ䛧
䛶 EMPA ௜ᒓ䛾 WDS 䛻䜘䜚⾜䛔䚸㉸ఏᑟ≉ᛶ䛿஺ὶᅄ➃Ꮚἲ䛻䜘䜛㟁Ẽ᢬ᢠ⋡ ᐃ䛸 SQUID ☢᮰ィ䜢⏝䛔䛯☢໬ ᐃ䛻䜘䜚ホ౯䛧䛯䚹⢏㛫 Jc [Jc (intergrain)] 䛿ṧ␃☢໬ἲ䛻䜘䜚ㄪ䜉䚸䛣䜜䜙 ᐃ䛷䛿☢ሙ䛿䝥䝺䝇㠃䛻ᆶ┤䛻༳ຍ䛧䛯䚹㻟䠊⤖ᯝ䛸⪃ᐹ㻌㻌 PO2 = 1-3 kPa ୗ䛾↝ᡂ䛻䜘䜚䚸䜋䜌༢┦䛾 Bi2223 ↝⤖య(x~ 0.35-0.55) ヨᩱ䛜ᚓ䜙䜜䛯䚹Fig. 1 䛻♧䛧䛯ᒁᡤ⤌ᡂศᯒ⤖ᯝ䜘䜚䚸↝⤖య୰䛾 Pb ⨨᥮㔞䛜௙㎸⤌ᡂ䛸䜋䜌ྠ䛨䛷䛒䜛䛣䛸䛜☜ㄆ䛷䛝䛯䚹䛥䜙䛻 Pb ⨨᥮㔞䛾ቑ኱䛻క䛔䚸᱁Ꮚᐃᩘ䛛䜙⟬ฟ䛩䜛┤᪉ᬗᛶ䛜ቑ኱䛧䚸Tc 䛜䜔䜔పୗ䛩䜛䛣䛸䜒䜟䛛䛳䛯䚹䛧䛛䛧 x 䛜 0.4 䜘䜚኱䛝䛔ሙྜ䛻䛿ᒁᡤ Pb ⨨᥮㔞䛾ศᕸ䛜኱䛝䛟䚸䜎䛯ᚤ⣽䛺୙⣧≀䛾ᯒฟ䜒㢧ⴭ䛸䛺䛳䛯䚹୍᪉䚸ཌ⭷ヨᩱ䛻䛚䛔䛶䛿 x 䜢ᶆ‽ⓗ䛺⥺ᮦ䛾⤌ᡂ䛷䛒䜛 0.35 ㏆ഐ䛷ቑຍ䛥䛫䛯䛸䛣䜝䚸Fig. 1 䛻♧䛧䛯䜘䛖䛻 Pb ⨨᥮㔞䛾ᆒ୍ᛶ䛜㧗䛔ヨᩱ䛜ᚓ䜙䜜䛯䚹䛥䜙䛻䚸䛣䜜䜙䛾 x 䛜䜔䜔኱䛝䛔ཌ⭷䛻䛚䛔䛶䜒䚸䛣䜜䜎䛷䛾ヨᩱస〇䛾▱ぢ[2]䜢⏕䛛䛩䛣䛸䛷c ㍈㓄ྥᗘ䛾㧗䛔 Bi2223 ༢┦ヨᩱ䛜స〇䛷䛝䛯䚹䛣䛾䜋䛛Pb ⨨᥮㔞䛾ቑ኱䛻క䛖␗᪉ᛶ䛾పῶ䜢཯ᫎ䛧䛯䚸☢ሙ୰⮫⏺㟁ὶ≉ᛶ䛾ᨵၿ䜔 Fig. 2 䛻♧䛩䜘䛖䛺≉䛻ప 䛷䛾⢏㛫
Jc 䛾ྥୖ䛜☜ㄆ䛷䛝䛶䛔䜛䚹ᙜ᪥䛿䚸Pb ⨨᥮㔞䛾኱䛝䛔ཌ⭷ヨᩱ䛻ᑐ䛩䜛㑏ඖ䝫䝇䝖䜰䝙䞊䝹䛻䜘䜛㔠ᒓ⤌ᡂไᚚຠᯝ䛻䛴䛔䛶䜒ሗ࿌䛩䜛䚹

Fig. 1 Relationship between nominal composition and actual
composition of lead for Bi2223 polycrystalline materials.

Fig. 2 Temperature dependence of intergrain-Jc for Bi2223
polycrystalline materials.
ཧ⪃ᩥ⊩㻌[1] Y. Takeda et al., Physica C 534 (2017) 9-12.
[2] Y. Takeda et al., Abstracts of CSSJ Conference 94 (2017) 179.

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第95回

2017年度秋季低温工学・超電導学会