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A new cubic perovskite in PbGeO3 at high pressures
Xiao, WS; Tan, DY; Zhou, W; Chen, M; Xiong, XL; Song, MS; Liu, J; Ma, HK; Xu, J; Liu J(刘景)
2012
发表期刊AMERICAN MINERALOGIST
卷号97期号:7页码:1193-1198
摘要A new cubic perovskite polymorph of PbGeO3 (Phase II) was synthesized by laser heating in the diamond-anvil cell (DAC) at the pressure of 36 GPa. Fitting the Birch-Murnaghan equation of state against its observed P-V data yields a bulk modulus K-0 of 196(6) GPa and the volume V-0 of 56.70(13) angstrom(3) when K-0' is assumed being 4. After the pressure is released, the PbGeO3 Phase II changes gradually into an amorphous phase, which contains mainly fourfold-coordinated germanium. It indicates that the PbGeO3 Phase II with a GeO6 octahedron framework transforms to a GeO4 tetrahedron network during the amorphization. The existence of PbGeO3 cubic perovskite Phase II at high pressures indicates that the polarized character of the Pb2+ ion induced by its 6s(2) lone pair electrons would be totally reduced in the environment of major silicate perovskites inside the lower mantle, and thus the Pb atom would substitute the Ca atom to enter the CaSiO3 perovskite.
关键词Lead germanate cubic perovskite high pressure amorphization
学科领域Geochemistry & Geophysics; Mineralogy
DOI10.2138/am.2012.4021
收录类别SCI
WOS记录号WOS:000306150600017
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被引频次:8[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224114
专题多学科研究中心
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Xiao, WS,Tan, DY,Zhou, W,et al. A new cubic perovskite in PbGeO3 at high pressures[J]. AMERICAN MINERALOGIST,2012,97(7):1193-1198.
APA Xiao, WS.,Tan, DY.,Zhou, W.,Chen, M.,Xiong, XL.,...&刘景.(2012).A new cubic perovskite in PbGeO3 at high pressures.AMERICAN MINERALOGIST,97(7),1193-1198.
MLA Xiao, WS,et al."A new cubic perovskite in PbGeO3 at high pressures".AMERICAN MINERALOGIST 97.7(2012):1193-1198.
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