Phase transition of MnF2 driven by shock compression at pressure of up to 33 GPa

被引：14
|
作者：
Hongo, Teruhisa
Nakamura, Kazutaka G. [1 ]
Atou, Toshiyuki
Kikuchi, Masae
Yubuta, Kunio
Itoh, Shun
Kusaba, Keiji
Fukuoka, Kiyoto
Kondo, Ken-Ichi
机构：
[1] Tokyo Inst Technol, Mat & Struct Lab, Yokohama, Kanagawa 2268503, Japan
[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 980, Japan
[3] Tohoku Fukushi Univ, Kansei Fukushi Res Ctr, Aoba Ku, Sendai, Miyagi 9893201, Japan
来源：
PHYSICAL REVIEW B | 2007年 / 76卷 / 10期
关键词：
D O I：
10.1103/PhysRevB.76.104114
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Rutile-type MnF2 was shock loaded at pressures of 3.6-33.4 GPa by the impact of flyer plates accelerated by a propellant gun. Recovered samples were examined by x-ray powder diffraction analysis and transmission electron microscopy (TEM). A phase transition from the rutile-type structure to the alpha-PbO2-type structure was found above 3.6 GPa. The yield of the alpha-PbO2 phase in the recovered samples increased for pressures of up to about 10 GPa and decreased at higher pressures. This phenomenon can be explained by a residual temperature effect. A lamellar pattern consisting of two crystalline phases (rutile and alpha-PbO2-type MnF2) was observed in the shocked sample by TEM observation. The shock-induced phase transition from the rutile-type structure to the alpha-PbO2-type structure was inferred to proceed via fluorite-related structures or a PbCl2-type structure by comparison with results of previous static high-pressure experiments.
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页数：6
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