Extended X-ray absorption fine structure study on anharmonic pair potential in CuBr

被引：19

作者：

Kamishima, O ^{[1
]}

Ishii, T ^{[1
]}

Maeda, H ^{[1
]}

Kashino, S ^{[1
]}

机构：

[1] OKAYAMA UNIV,FAC ENGN,OKAYAMA 700,JAPAN

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 1997年 / 36卷 / 1A期

关键词：

EXAFS; CuBr; pair potential; anharmonicity; Gruneisen parameter; phonon dispersion relations;

D O I：

10.1143/JJAP.36.247

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The Cu K-edge EXAFS (extended X-ray absorption fine structure) of CuBr has been measured at room temperature. An anharmonic pair potential for the Cu-Br bond introduced as Phi(u) = Phi(o) + (1/2!)au(2) + (1/3!)beta u(3) in a central-field approximation is determined by numerical integration of the EXAFS function: obtained values of alpha and beta are 2.28(4) eV/Angstrom(2) and -8(1)eV/Angstrom(3), respectively, and the Gruneisen parameter gamma(G) = -(R(o)/G)(beta/alpha) is obtained as 1.5(2) using these values. These values are concluded to be reasonable from comparison with previously obtained Gruneisen parameters and from studying phonon dispersion relations.

引用

页码：247 / 253

页数：7

共 23 条

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