Clinopyroxene-perovskite phase transition of FeGeO3 under high pressure and room temperature

被引：21

作者：

Hattori, T ^{[1
]}

Matsuda, T ^{[1
]}

Tsuchiya, T ^{[1
]}

Nagai, T ^{[1
]}

Yamanaka, T ^{[1
]}

机构：

[1] Osaka Univ, Grad Sch Sci, Dept Earth & Space Sci, Osaka 5600043, Japan

来源：

PHYSICS AND CHEMISTRY OF MINERALS | 1999年 / 26卷 / 03期

关键词：

FeGeO3-clinopyroxene; FeGeO3-perovskite; lithium niobate structure; high pressure at room temperature;

D O I：

10.1007/s002690050179

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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) Angstrom, b=5.06(6) Angstrom, c=6.66(3) Angstrom and V=166(3) Angstrom(3) at 40 GPa. On release of pressure, the perovskite phase transformed into lithium niobate structure. The previously reported decomposition process of clinopyroxene into Fe2GeO4 (spinel)+GeO2 (rutile) or FeO (wustite) +GeO2 (rutile) was not observed. This shows that the transition of pyroxene to perovskite is kinetically accessible compared to the decomposition processes un der low-temperature pressurization.

引用

页码：212 / 216

页数：5

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