High-pressure structural behavior and equation of state of NaZnF3

被引：23

作者：

Yakovlev, Sergey ^{[1
]}

Avdeev, Maxim ^{[1
]}

Mezouar, Mohamed ^{[2
]}

机构：

[1] Australian Nucl Sci & Technol Org, Bragg Inst, Menai, NSW 2234, Australia

[2] European Synchrotron Radiat Facil, ID27, F-38043 Grenoble, France

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2009年 / 182卷 / 06期

关键词：

Perovskite; Postperovskite; Pressure; Diamond anvil cell; Synchrotron X-ray diffraction; Rietveld refinement; Ab-initio calculation; POST-PEROVSKITE PHASE; X-RAY; TRANSITION; MGSIO3;

D O I：

10.1016/j.jssc.2009.03.031

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

We report the results of density functional theory ab-initio calculations and monochromatic synchrotron X-ray diffraction study carried out for orthorhombic NaZnF3 in the pressure range 0-40 GPa. Perovskite-to-postperovskite phase transition was anticipated by first-principles computations and then observed in high-pressure diamond anvil cell synchrotron diffraction experiment between 14 and 22 GPa. Above 25 GPa postperovskite structure (CaIrO3 type, space group Cmcm) coexists with another phase, yet unidentified. On decompression, pure postperovskite-type structure was found to be stable down to 4 GPa: below this pressure sample contained both perovskite and postperovskite modifications. Fit of experimental P-V data to the third-order Birch-Murnaghan equation of state gave bulk moduli, K-P,K-0 64.98 +/- 2.67 and 69.88 +/- 3.69 GPa for perovskite and postperovskite modifications, respectively. Both phases demonstrated strong anisotropy of compressibility. For postperovskite NaZnF3, the highest compression was observed along the direction perpendicular to the planes of ZnF6 octahedra arrangement. (C) 2009 Elsevier Inc. All rights reserved.

引用

页码：1545 / 1549

页数：5

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