High‐pressure and high‐temperature <i>in situ</i> x‐ray Diffraction study of iron to above 30 Gpa using MA8‐type apparatus

• Nobumasa Funamori

• Takehiko Yagi

• Takeyuki Uchida

抄録

In situ x‐ray diffraction experiments on iron at pressures of 22–32 GPa and temperatures of 300–1500 K were carried out using an MA8‐type high‐pressure apparatus, employing sintered diamond anvils, combined with synchrotron radiation. No phases other than ε(hcp) and γ(fcc) were observed in this pressure and temperature range. It became clear that non‐hydrostaticity or chemical reaction with hydrogen causes serious problems in high‐pressure and high‐temperature x‐ray diffraction study on iron. The average thermal expansivity of ε phase between 300 K and 1000 K and the zero‐pressure bulk modulus of γ phase at 1400 K were determined by assuming that no chemical reaction occurred in the present study. The thermal expansivities of ε iron at 22 GP a and 32 GP a are determined to be 3.88 × 10 −5 K −1 and 3.16 × 10 −5 K −1 , respectively. In this case, the volume at 22–32 GPa and room temperature is about 1% larger than the literature value. The bulk modulus of γ iron is determined to be 120 GPa, when its pressure derivative is fixed at 5.

収録刊行物

• Geophysical Research Letters

  Geophysical Research Letters 23 (9), 953-956, 1996-05

  American Geophysical Union (AGU)

キーワード

• General Earth and Planetary Sciences
• Geophysics

詳細情報

• CRID: 1363951796226983808
• NII論文ID: 80008978457
• DOI: 10.1029/96gl00943
• ISSN: 19448007
• ISSN: 00948276
• Web Site: https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F96GL00943
• Web Site: https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/96GL00943
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