Crystal chemistry of NaMgF3 perovskite at high pressure and temperature

被引:16
作者
Chen, JH [1 ]
Liu, HZ [1 ]
Martin, CD [1 ]
Parise, JB [1 ]
Weidner, DJ [1 ]
机构
[1] SUNY Stony Brook, Inst Mineral Phys, Stony Brook, NY 11794 USA
关键词
D O I
10.2138/am.2005.1708
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The crystal structure of NaMgF3 perovskite (neighborite) has been studied at 4 GPa and temperatures up to 1000 degrees C using the Rietveld structure-refinement method. In situ synchrotron X-ray powder diffraction data was collected using monochromatic radiation. The orthorhombic (Pbnm) to cubic (Pm (3) over barm) transition was observed when the temperature increased from 900 to 1000 degrees C. Structure refinements show that the ratio of polyhedral volumes of the A and B sites (V-A/V-B) of the orthorhombic phase increases with temperature, approaching the ideal value (5) for the cubic structure. However, this ratio becomes smaller at 4 GPa compared to the result from previous studies at the same temperature but ambient pressure, indicating that pressure makes it more difficult to transform from the orthorhombic phase to the cubic phase in this kind of perovskite.
引用
收藏
页码:1534 / 1539
页数:6
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