Clinopyroxene-perovskite phase transition of FeGeO3 under high pressure and room temperature |
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| Authors: | T Hattori T Matsuda T Tsuchiya T Nagai T Yamanaka |
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| Institution: | (1) Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-16 Machikaneyama, Toyonaka, Osaka 560-0043, Japan e-mail: takanori@esstop.ess.sci.osaka-u.ac.jp Fax: +81-6-850-5817, JP |
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| Abstract: | In order to confirm the possible existence of FeGeO3 perovskite, we have performed in situ X-ray diffraction measurements of FeGeO3 clinopyroxene at pressures up to 40 GPa at room temperature. The transition of FeGeO3 clinopyroxene into orthorhombic perovskite is observed at about 33GPa. The cell parameters of FeGeO3 perovskite are a=4.93(2) Å, b=5.06(6) Å, c=6.66(3) Å and V=166(3) Å3 at 40 GPa. On release of pressure, the perovskite phase transformed into lithium niobate structure. The previously reported decomposition process of clino-pyroxene into Fe2GeO4 (spinel)+GeO2 (rutile) or FeO (wüstite) +GeO2 (rutile) was not observed. This shows that the transition of pyroxene to perovskite is kinetically accessible compared to the decomposition processes under low-temperature pressurization. |
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| Keywords: | FeGeO3-clinopyroxene FeGeO3-perovskite Lithium niobate structure High pessure at room temperature |
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