Phase boundary between rutile-type and CaCl2-type germanium dioxide determined by in situ X-ray observations

Shigeaki Ono, Kei Hirose, Norimasa Nishiyama, Maiko Isshiki

研究成果: ジャーナルへの寄稿記事

24 引用 (Scopus)

抄録

In situ synchrotron X-ray experiments of the GeO2 system were made at pressures of 28-45 GPa and temperatures of 300-2300 K, using a diamond anvil cell combined with a laser heating and a 6-8 type multianvil high-pressure apparatus. We observed a second-order phase transition between tetragonal rutile-type (P42/mnm) and orthorhombic CaCl2-type (Pnnm) phases under high pressure and temperature. The transition kinetics seem to have little effect on the second-order phase transition because the cell constants exhibit no discontinuities between the phases. Therefore, the phase transitions could be observed at low temperature conditions in this study. The phase boundary was determined to be P (GPa) = (34.9 ± 1.2) + (0.0086 ± 0.0024) × (T - 1300) (K).

元の言語英語
ページ(範囲)99-102
ページ数4
ジャーナルAmerican Mineralogist
87
発行部数1
DOI
出版物ステータス出版済み - 1 1 2002

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germanium
Phase boundaries
rutile
phase transition
dioxides
Phase transitions
X rays
Laser heating
diamond anvil cell
Diamond
x rays
Synchrotrons
Temperature
laser heating
discontinuity
anvils
laser
cells
heating
kinetics

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

これを引用

Phase boundary between rutile-type and CaCl2-type germanium dioxide determined by in situ X-ray observations. / Ono, Shigeaki; Hirose, Kei; Nishiyama, Norimasa; Isshiki, Maiko.

:: American Mineralogist, 巻 87, 番号 1, 01.01.2002, p. 99-102.

研究成果: ジャーナルへの寄稿記事

Ono, Shigeaki ; Hirose, Kei ; Nishiyama, Norimasa ; Isshiki, Maiko. / Phase boundary between rutile-type and CaCl2-type germanium dioxide determined by in situ X-ray observations. :: American Mineralogist. 2002 ; 巻 87, 番号 1. pp. 99-102.
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