STABILITY AND THE EQUATION OF STATE OF ALPHA-MANGANESE UNDER ULTRAHIGH PRESSURE

被引:53
作者
FUJIHISA, H [1 ]
TAKEMURA, K [1 ]
机构
[1] NATL INST RES INORGAN MAT,TSUKUBA,IBARAKI 305,JAPAN
来源
PHYSICAL REVIEW B | 1995年 / 52卷 / 18期
关键词
D O I
10.1103/PhysRevB.52.13257
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have performed angle dispersive synchrotron-radiation x-ray powder-diffraction experiments on a-Mn up to 190 GPa at room temperature by using a diamond-anvil cell and an imaging plate. We have obtained evidence for a structural phase transition in Mn above 165 GPa. A new diffraction peak appeared above 165 cpa, which can be most likely indexed to the 110 reflection of a body-centered-cubic structure. The volume reduction associated with the structural phase transition was estimated to be 2%. The bulk modulus and its pressure derivative of alpha-Mn were determined as B-0 = 158 GPa and B-0' = 4.6, respectively. The pressure dependence of the bulk modulus indicates the decrease of the magnetic moments of Mn under pressure.
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收藏
页码:13257 / 13260
页数:4
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