放电等离子烧结
材料科学
微观结构
热电效应
微晶
热导率
热电材料
电阻率和电导率
分析化学(期刊)
退火(玻璃)
晶体结构
冶金
结晶学
复合材料
化学
热力学
物理
工程类
电气工程
色谱法
作者
Atsuko Kosuga,Kunihiro Nakai,Mie Matsuzawa,Yuya Fujii,Ryoji Funahashi,Takuya Tachizawa,Yoshiki Kubota,Kouichi Kifune
标识
DOI:10.1016/j.jallcom.2014.08.183
摘要
We report the effects of spark plasma sintering (SPS) and subsequent annealing on the crystal structure, microstructure, and thermoelectric properties of polycrystalline GeSb6Te10. GeSb6Te10 consolidated using SPS consisted of a mixture of GeSb6Te10-type homologous and Sb2Te3-type tetradymite structures, whereas the sample prepared by melting had a single homologous structure. SPS produced small amounts of Ge-rich precipitates with a few micrometers in size. Even excluding these precipitates, the elemental compositional deviation from the nominal composition was wider than that for the sample prepared by melting. This implies that SPS promoted atomic diffusion and rearrangement of elements, leading to a substantial change in the crystal structure and elemental distribution of GeSb6Te10. SPS improved the power factor but also increased the thermal conductivity, as a result of the increased electrical conductivity, yielding a maximum dimensionless figure of merit, ZTmax, of 0.33 at 710 K, which is similar to the value for the sample prepared by melting (0.39 at 710 K).
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