Octahedral tilting evolution and phase transition in orthorhombic NaMgF3 perovskite under pressure -: art. no. L04304

被引：52

作者：

Liu, HZ ^{[1
]}

Chen, J

Hu, J

Martin, CD

Weidner, DJ

Häusermann, D

Mao, HK

机构：

[1] Argonne Natl Lab, High Pressure Collaborat Access Team, Adv Photon Source, Argonne, IL 60439 USA

[2] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA

[3] SUNY Stony Brook, Mineral Phys inst, Stony Brook, NY 11794 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2005年 / 32卷 / 04期

关键词：

D O I：

10.1029/2004GL022068

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

[1] Rietveld refinement of monochromatic synchrotron x-ray powder diffraction data was used to study the evolution of octahedral tilting in the orthorhombic NaMgF3 perovskite under pressure. Hydrostatic pressure conditions were ensured up to 16 GPa using helium as a pressure medium. The tilting angles of MgF6 octahedral framework were observed to increase with increasing pressure. The compression mechanism was observed to be dominated by the shortening of the octahedral Mg-F bond below 6 GPa, and then controlled by the increase of the octahedral tilting above 12 GPa. The bulk modulus of NaMgF3 was estimated as 76.0 +/- 1.1 GPa. A phase transition was observed at about 19.4 GPa in a separate run when silicone oil was used as pressure medium, and this high-pressure phase could be rationalized in term of a post-perovskite structural model.

引用

页码：1 / 5

页数：5

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