Stable phase with the α-PbO2 type structure in MgF2 under high pressure and high temperature

被引：12

作者：

Kusaba, Keiji ^{[1
]}

Kikegawa, Takumi ^{[2
]}

机构：

[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[2] High Energy Accelerator Res Org, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan

来源：

SOLID STATE COMMUNICATIONS | 2008年 / 148卷 / 9-10期

关键词：

Crystal structure and symmetry; Phase transition; High pressure; Synchrotron radiation;

D O I：

10.1016/j.ssc.2008.09.017

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

High-pressure and high-temperature behavior of MgF2 was observed up to 15 GPa and 750 degrees C by an in situ X-ray diffraction method. The single phase with the alpha-PbO2 type structure was obtained at 12.7 GPa and 750 degrees C. The phase was almost quenchable to ambient condition. Its orthorhombic cell parameters were a(0) = 4.590(1) angstrom, b(0) = 5.555(1) angstrom and c(0) = 5.048(1) angstrom and its volume per chemical formula was 1.1% smaller than that of the rutile phase at ambient condition. MgF2 was confirmed to have a stable region for the phase at around 13 GPa and 600 degrees C and to have the rutile-CaCl2-alpha-PbO2-PdF2 type phase transition series under high pressure and high temperature, as predicted by a previous theoretical calculation method. The bulk modulus of the or-PbO2 type phase was determined to be K-0 = 98.0(7) GPa. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：440 / 443

页数：4

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