− 10 −๟ᦼ᭴ㅧ߇ᰴ‫ޔࠇ⃻ߣޘ‬GeTe-Sb2Te3 ᡆੑర♽x1000x10000ߣห᭽ߦ‫ࠍ⋧ࠬࠟࡠࡕࡎޔ‬ᒻᚑߔࠆߎߣ߇᣿

2514ࠄ߆ߣߥߞߡ޿ࠆ[4]‫ޕ‬ᚒ‫ޔߪޘ‬m=1 ♽ߦ߅޿
Intensity (arb. units)12ߡ‫ޔ‬Sb ࡝࠶࠴஥ߦ‫ޔ‬ዋߥߊߣ߽ Sb16Te3㧔n=7㧕߹ߢߪ‫ޔ‬㊄ዻ㑆ൻว‛߇ሽ࿷ߔࠆߎߣࠍ⏕⹺ߒߡ߅ࠅ‫ߩߘޔ‬᭴ㅧ⸃ᨆߦᚑഞߒߡ޿ࠆ
㧔 R3 m ‫ޔ‬57 ጀ hR19 ᭴ㅧ‫ޕ‬࿑㧝‫⊕ޔ‬ਣ㧦Sb‫ޔ‬㤥ਣ㧦Te㧕[5]‫⃻ޕ‬࿷‫ޔ‬ᣢߦ᭴ㅧ߇᳿ቯߐࠇߡ

2010815640

10-225.0

30.035.0

40.0

5޿ࠆ Sb-Te ♽‫ޔ‬Bi-Te ♽ߪ‫ ߫߃ߣߚޔ‬Sb ߣ Bi
㧔m=0㧕‫ޔ‬Sb2Te3 ߣ Bi2Te3㧔n=0‫ޔ‬m=1㧕‫ޔ‬Sb4Te30ߣ Bi4Te3㧔n=1‫ޔ‬m=1㧕ߪ‫ޔ‬ਔ⠪ߩ᭴ㅧ߇‫ోޔ‬2.0

5.0

10.0

15.020.025.030.0ǰ (deg.)ߊ╬ߒ޿‫ޔߡߞࠃޕ‬Bi-Te ♽߽‫ޔ‬Sb-Te ♽ߣหߓߊ‫ޔ‬Bi2(n+m)Te3m ߣ⸥ㅀߐࠇࠆࡎࡕࡠࠟࠬ⋧ࠍᒻᚑߔࠆ߽ߩߣ⠨߃ࠄࠇ‫ޔߡߒߘޔ‬᭴ㅧᧂObserved (+) and calculated (gray line) X-ray᳿ቯߩ߽ߩߦߟ޿ߡ߽‫⚵ޔ‬ᚑ߇หߓߢ޽ࠇ߫‫ ޔ‬࿑㧞.
diffraction profiles of BiTe at 92 K. A difference curve⸒޿឵߃ࠇ߫‫ޔ‬n‫ޔ‬m ߇╬ߒߌࠇ߫‫( ߩࠄࠇߘޔ‬observed–calculated) appears at the bottom of each⚿᥏᭴ㅧ߽‫ޔ‬ห৻ߢ޽ࠆߣᦼᓙߐࠇࠆ‫ޕ‬ᚒ‫ ޘ‬Figure, and under the curve, vertical spikes indicate theߪ‫੹ޔ‬ታ㛎ߦ߅޿ߡ‫ޔ‬m ߇ 1 ࠃࠅᄢ߈޿ᐞߟ reflection markers.
߆ߩ⚵ᚑߩ‫ޔ‬Sb-Te ♽㧛Bi-Te ♽⚿᥏ߦߟ޿ߡ
࿁᛬ታ㛎ࠍⴕ޿‫ߩࠄࠇߘޔ‬᭴ㅧ⸃ᨆࠍ⹜ߺߚ‫⃻ޔߢ߆ߥߩߘޕ‬࿷‫ޔ‬BiTe㧔Bi50Te50㧕ߩ᭴ㅧ⸃ᨆߦᚑഞ⴫㧝.
Refined structural parameters for BiTe at 92K.
The space group is R3 m . Standard deviations areshown in parentheses. The final R-factors and lattice
parameters are Rwp = 3.46%, Rp = 2.16%, RI = 1.42%,Rwp expected = 1.33% and a = 4.42486(6) Å, c =185.124(2) Å. Overall isotropic temperature factor wasapplied to and x = y = 0 for all site in common. Ball =0.562(9) Å2atomsitegz

Te1
Bi/Te1
Bi1
Bi/Te2
Te2Bi/Te3
Bi2Bi/Te4
Te3Bi/Te5Bi3Te4Te5Bi4Bi5Te63(a)6(c)6(c)6(c)
6(c)
6(c)
6(c)
6(c)
6(c)
6(c)
6(c)
6(c)
6(c)
6(c)
6(c)
6(c)

1.0
0.58(3)/0.42
1.0
0.45(4)/0.55
1.0
0.65(3)/0.35
1.0
0.37(3)/0.63
1.0
0.70/0.30
1.0
1.0
1.0
1.0
1.0
1.0

0
0.03317( 8)0.06481( 7)0.09516( 7)0.12986( 9)0.16157( 6)0.19355( 5)0.22450( 7)0.25867(10)0.29094( 7)0.32214( 5)0.35372(10)0.38765(11)0.41902( 5)0.45132( 5)0.48328( 9)ߒߚߩߢ‫ޔ‬એਅߦ⚫੺ߔࠆ‫ޕ‬☳ᧃ࿁᛬᷹ቯ↪ߩ⹜ᢱߪ‫ޔ‬ᰴߦ␜ߔᣇᴺߦࠃࠅ૞ᚑߒߚ‫ޕ‬వߕ⸥㍳⤑ࠍ‫⋥ޔ‬ᓘ 120mm ߩࠟ࡜ࠬ⵾࠺ࠖࠬࠢ᧼਄ߦࠬࡄ࠶࠲ᴺߦߡ 3000Έෘ⒟ᐲᒻᚑߔࠆ‫ޕ‬ᚑ⤑⋥ᓟߪࠕࡕ࡞ࡈࠔࠬ⁁ᘒߢ޽ߞߚ‫࡯ࠩ࡯࡟ࠍࠇߎޕ‬ᾖ኿ߦࠃࠅ‫ޔ‬Ḱ቟ቯ⋧ߦ⚿᥏ൻ㧔initialize㧕ߐߖߚ‫ޕ‬ᰴߦ⸥㍳⤑ࠍࠬࡄ࠴ࡘ࡜࡯ࠍ↪޿ߡᡂࠅ⪭ߣߒ☳ᧃൻߒߚ‫ࠍᧃ☳ߩߘޕ‬ౝ
ᓘ 0.1mm ߩ⍹⧷ࠟ࡜ࠬ⵾ࠠࡖࡇ࡜࡝࡯ߦలႯߒ‫ޔ‬᡼኿శߦࠃࠆ࿁᛬ታ㛎↪⹜ᢱߣߒߚ‫ޕ‬ᄢ᳇ߣߩធ⸅ࠍㆤᢿߔࠆߚ߼‫⹜ߩ࡯࡝࡜ࡇࡖࠠޔ‬ᢱᝌ౉ญࠍࠕ࠮࠴࡟ࡦ㧛㉄⚛ᷙวࠟࠬࡃ࡯࠽࡯ߢኽߓಾߞߚ ‫ ⹜ ޕ‬ᢱ ߩ ⚵ ᚑ ߪ ‫ ޔ‬ICP ⊒ శ ಽ శ ಽ ᨆ ᴺ㧔Inductively Coupled Plasma – Atomic Emission
Spectrometry㧕ߦࠃࠅ‫⺋ޔ‬Ꮕ▸࿐ౝߢ‫ޔ‬Bi:Te=50:50
ߢ޽ࠆߎߣࠍ‫ޕࠆ޿ߡߒ⹺⏕ޔ‬☳ᧃ࿁᛬ታ㛎ߪ㧔⽷㧕㜞ノᐲశ⑼ቇ⎇ⓥ࠮ࡦ
࠲࡯㧔SPring-8㧕‫ޔ‬BL02B2 ࡜ࠗࡦ[6]ߢⴕߞߚ‫ޕ‬᡼኿శߪ‫ޔ‬ੑ⚿᥏ಽశེߦࠃࠅන⦡ൻߐߖߚᓟ‫ޔ‬ᓟ⟎ࠦ࡝ࡔ࡯࠲࡯ࡒ࡜࡯ߦࠃࠅᐔⴕൻߐߖ‫ޔ‬࿁᛬ታ㛎↪౉኿ࡆ࡯ࡓߣߒߡ↪޿ߚ‫౉ޕ‬኿ࡆ࡯ࡓߩࠛࡀ
࡞ࠡ࡯ߪ 29.5keV ߢ޽ࠆ‫ࠗࡃ࠺ޕ‬㧙ࠪࠚ࡜࡯ࠞࡔ
࡜ߩࠞࡔ࡜ඨᓘߪ 287mm ߢ޽ࠅ‫৻ޔ‬ᣇࠗࡔ࡯ࠫ

− 11 −

− 12 −ߥ᭴ㅧࠍᜬߞߚ⚿᥏ߣߔࠆߎߣ߇ߢ߈ࠆ[2]‫⚿ߩࠄࠇߎޕ‬᥏ߪ‫ޔ‬ⓨ㑆⊛ߦ╬ᣇ⊛ߢ‫ޔ‬਌ߟ࡜ࡦ࠳ࡓߥේ
ሶ㈩೉ࠍ᦭ߔࠆ‫ޔߦ߁ࠃߩߎޕ‬ታ↪᧚ᢱߪ‫߈ᦠޔ‬឵߃᷷ᐲߦߡ‫ߩࠬࠔࡈ࡞ࡕࠕޔ‬ේሶ㈩೉ߦᭂ߼ߡㄭ
޿ේሶ㈩೉ࠍᜬߟ⚿᥏⋧߇ሽ࿷ߔࠆ߇᡿ߦ‫ޔ‬ᢙ 10ns ߣ޿߁‫ޔ‬ᭂ߼ߡ⍴ᤨ㑆ߢ‫ޔ‬࿕૕ߩ⁁ᘒߩ߹߹‫ࠕޔ‬ࡕ࡞ࡈࠔࠬ⋧߆ࠄ⚿᥏⋧߳ߩ⋧ォ⒖ࠍน⢻ߦߒߡ޿ࠆߣ⠨߃ࠄࠇߡ޿ࠆ[2]‫੹ޕ‬ᓟ‫ޔ‬ᾲᐔⴧ⁁ᘒߩ᭴ㅧ⸃ᨆࠍㅴ߼ߡࠁߊߣߣ߽ߦ‫ޔ‬ዋ㊂ᷝട‛ߩ᭴ㅧ߳ߩነਈ㧛ᓇ㗀ࠍ⺞ߴ‫․ߦᦝޔ‬ᕈߦఝࠇߚ‫⋧ޔ‬ᄌൻ᧚ᢱࠍ㐿⊒ߒߡⴕ߈ߚ޿‫ޕ‬ෳ⠨ᢥ₂[1]

Yamada, N.; Ohno, E.; Nishiuchi, K.; Akahira, N.; Takao, M. J. Appl. Phys. 1991, 69(5), 1, 2849.

[2]

Matsunaga, T.; Yamada, N. Jpn. J. Appl. Phys. 2004, 43, 7B, 4704.

[3]

Anderson, T. L.; Krause, H. B. Acta Crystallogr. B, 1974, 30, 1307.

[4]

Shelimova, L. E.; Karpinsky, O. G.; Konstantinov, P. P.; Kretova, M. A.; Avilon, E. S.; Zemskov, V. S. Inorg. Mater.
2001, 37, 4, 342.

[5]

Kifune, K.; Kubota, Y.; Matsunaga, T.; Yamada, N. Acta Crystallogr. B 2005, 61, 492.

[6]

Nishibori, E.; Takata, M.; Kato, K.; Sakata, M.; Kubota, Y.; Aoyagi, S.; Kuroiwa, Y.; Yamakata, M.; Ikeda, N. Nucl.
Instrum. Methods 2001, A467-468, 1045[7]Rietveld, H. M.: J. Appl. Cryst. 1969, 2, 65[8]Izumi, F.; Ikeda, T. Mater. Sci. Forum, 2000, 321-324, 198[9]Wyckoff, R. W. G. Crystal Structures, Vol. 2, Krieger, Malabar 1986.

[10] Feutelais, Y.; Legendre, B.; Rodier, N.; Agafonov, V. MATERIALS RESEARCH BULLETIN 1993, 28, 591[11] Yamans K.; Kihara K.; Matsumoto T. Acta Crystallogr. B, 1979, 35, 147[12] Wyckoff, R. W. G. Crystal Structures, Vol. 2, Interscience, NewYork 1963.
[13] Shimazaki, H.; Ozawa, T. AMERICAN MINERALOGIST 1978, 63, 1162

− 13 −