Probing phonon scattering sites in the thermoelectric clathrate Eu8Ga16Ge30

被引：3

作者：

Bridges, F ^{[1
]}

Baumbach, R

Cao, D

Chesler, P

Anderson, M

Sales, B

机构：

[1] Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA

[2] Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA

来源：

RADIATION EFFECTS AND DEFECTS IN SOLIDS | 2003年 / 158卷 / 1-6期

基金：

美国国家卫生研究院; 美国国家科学基金会;

关键词：

clathrate; XAFS; thermoelectric; rattler; Eu8Ga16Ge30; Sr8Ga16Ge30;

D O I：

10.1080/1042015021000051954

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

The low thermal conductivity of the Thermoelectric Clathrates Eu8Ga16Ge30 and Sr8Ga16Ge30 has been attributed to rattling atoms (Eu or Sr) in the Eu2/Sr2 sites. The low Einstein temperature obtained using XAFS for the nearest neighbor Eu-Ga/Ge bonds at the Eu2 sites is consistent with the model. However, the comparable Einstein temperature for the Eu1 site indicates that Eu1 is also a rattler. The fit also confirms that the Eu2 is displaced along either the y or z axis similar to 0.45Angstrom in agreement with neutron diffraction.

引用

页码：343 / 347

页数：5

共 4 条

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PHYSICAL REVIEW B, 2001, 63 (24)

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