実験報告書様式（一般利用課題・成果公開利用）（ ※本報告書は英語で記述してください。ただし、産業利用課題として採択されている方は日本語で記述していただいても結構です。 ）承認日 Date of Approval 2014/8/27
承認者 Approver Takanori HATTORI
提出日 Date of Report 2014/8/18

Experimental Report
課題番号 Project No.

装置責任者 Name of Instrument scientist

2014A0049

実験課題名 Title of experiment: Hydrogen in Iron Formed byTakanori Hattori

the Reaction of Iron, Silicate, and Water under High-Pressure

装置名 Name of Instrument/（BL No.）and High-Temperature Conditions

BL-11

実験責任者名 Name of principal investigator : Takehiko Yagi

実施日 Date of Experiment

所属 Affiliation : University of Tokyo

2014/6/2 & 6/4-6/8 (5 days)

試料、実験方法、利用の結果得られた主なデータ、考察、結論等を、記述して下さい。（適宜、図表添付のこと）
Please report your samples, experimental method and results, discussion and conclusions. Please add figures andtables for better explanation.
1. 試料 Name of sample(s) and chemical formula, or compositions including physical form.
A powder mixture of Fe, Mg(OD)2, and SiO2 in the molar ratio of 2:1:1. This mixture was placed in the sample
chambermade ofgraphite0122のセルアセンブリ
and compressed in the solid pressure transmitting medium as below.
#A0121,0122,
8.5

11.0

1.78h
2.5t

プレガスケット

・圧媒体１辺は10.5 mm、700℃で15分焼いた

2.パイロフィライトをプレガスケットに用いた。
実験方法及び結果 （実験がうまくいかなかった場合、その理由を記述してください。）

・電極はヒータよりも大きなMoの円筒とし、圧Experimental method and results. If you failed to conduct experiment as planned, please describe reasons.
媒体にザグリを入れてこの中に入れた。
In total five high pressure runs were made but “blow out” have happened in two of them. We have tested the・電極方向の熱の逃げを抑えるため、Mo電極のsample
assembly in advanceat ISSP, University of Tokyo, many times without such problems. We have found
円板の上下にLaCrO3を配置した。
・サンプルカプセルの中には、ペレットに成形しthat
the anvils used at PLANET are very brittle and easy to break when it was used several times. It looks that
たFe+SiO+Mg(OD)
2(混合比2:1:1)を入れた。試thecurrent 2designof anvils
used at PLANET has some problems and we can reach only up to very limited P-T

4 preliminary tests
range. In order to overcome this problem, we are now designing new anvils and we have made
料体積はΦ2.0mmx2.5mmh。

but because of the limitation of machine time, we could not use it in the present machine time.
Another problem we have found was the dissolution of carbon to the sample. We have tested various
materials for sample capsule. It has to satisfy the following conditions: high capability to seal hydrogen andhigh enough melting temperature to keep the molted sample. All the metals such as Pt and Re has melted
below 1500 ℃ under the existence of hydrogen and graphite was the only material which satisfied theserequirements but the amount of carbon dissolved into the sample was higher than we expected and we havelowered the temperature in the 5th run.

2. 実験方法及び結果（つづき） Experimental method and results (continued)
Various parameters of experiments are summarized below.

Examplesof the diffraction
pattern we have obtained in run A0124 are sown below.
#A0124:
加熱過程の回折パターン〜〜

Initial, RT

Intensity

Recovered, RT
bccに戻るRT▼ ▼▼▼▼▼*▼Brucite
Fe fcc＊Fe bcc▼OlivineSiO2
Graphite

111

**

*

*

002

**

fccに戻る

700℃
500℃

bccに戻る

400℃
300℃
400℃
500℃

600℃
olivine 成長
700℃
brucite 脱水分解
bcc→fcc
500℃
300℃
4.5GPa, RTTOF (usec)- 加圧前のパターンには、Fe bccとMg(OD)2、SiO2由来のピークが見られる。

The qualityof the diffraction patterns under high P-T conditions are quite high, as expected, but the P-T- 前回よりもbruciteの分解温度が低い（前回は800℃）- 高温下での生成物は、Fe(bccまたはfcc)とオリビンのみで、Fe-C化合物らしきピークは見られなかった。
conditions
we could reach was lower than that we have anticipated. Therefore we need some more experiments

before- それぞれの測定時間は5〜40分。
we can get any conclusive results.

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