文献类型：期刊文献

英文题名：Synthesis and Thermoelectric Properties of the Clathrate-I Phase K8Li x Ge44-x/4a-2-3x/4

作者：Liang, Ying[1];Schnelle, Walter[2];Veremchuk, Igor[2];Boehme, Bodo[2];Baitinger, Michael[2];Grin, Yuri[2]

机构：[1]E China Univ Sci & Technol, Sch Sci, Inst Nucl Technol & Applicat, Shanghai 200237, Peoples R China;[2]Max Planck Inst Chem Phys Fester Stoffe, D-01187 Dresden, Germany

年份：2015

卷号：44

期号：11

起止页码：4444

外文期刊名：JOURNAL OF ELECTRONIC MATERIALS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000361903000048)】；

基金：This work was supported by the National Natural Science Foundation of China (No. 51301071), the Science and Technology Commission of Shanghai Municipality (No. 13PJ1401800) and the Innovation Program of Shanghai Municipal Education Commission (No. 14ZZ057). The authors acknowledge the support of Dr. U. Burkhardt during metallographic characterization.

语种：英文

外文关键词：Clathrate; spark plasma synthesis; crystal structure; thermoelectric properties

摘要：Thermoelectric transport properties at temperatures below 300 K were determined for clathrate-I phases K8Li (x) Ge(44-x/4)a-(2-3x/4) (a- denotes a vacancy) with compositions 0.25 a parts per thousand currency sign x a parts per thousand currency sign 2.7. Samples were prepared by solid-state reaction and compacted by spark plasma sintering. The lattice constants and chemical composition of the samples were investigated by x-ray powder diffraction and wavelength dispersive x-ray spectroscopy, respectively. Depending on composition, the temperature dependence of the electrical resistivity is metal or semiconductor-like. Absolute value of the negative Seebeck coefficient (n-type conductivity) increased linearly with temperature. All samples had low thermal conductivity of 1-1.5 W m(-1) K-1 at 300 K.