Influence of growth rate and orientation on thermoelectric properties in Mg3Sb2 crystal

Xin Li, Hui Xie, Bin Yang, Hong Zhong, Shuangming Li

科研成果: 期刊稿件文章同行评审

8 引用 (Scopus)

摘要

Ag-doped Mg3Sb2 single crystal was successfully grown via a directional solidification method with high temperature gradient. The influence of microstructure, growth rate, and orientation on the thermoelectric properties was investigated. It was revealed that the changed growth rate results in a slight adjustment of chemical composition in Mg3Sb2 crystal. The crystal exhibits better thermoelectric performance at the rate of 18 mm h−1. The Seebeck coefficient (S) and electrical conductivity (σ) are anisotropic in [001] and [100] orientation. The thermal conductivity exhibits isotropic property. The top value of Seebeck coefficient is 267 µV K−1 in the [001] orientation, which is dramatically improved compared with previous results. As a consequence, the maximum value of the power factor for the [001]-oriented crystal is 1.21 m Wm−1K−2 at v = 18 mm h−1, which results in an elevated ZT of 0.68. This result is verified well by Hall testing and density functional theory calculations.

源语言英语
页(从-至)9773-9782
页数10
期刊Journal of Materials Science: Materials in Electronics
31
12
DOI
出版状态已出版 - 1 6月 2020

指纹

探究 'Influence of growth rate and orientation on thermoelectric properties in Mg3Sb2 crystal' 的科研主题。它们共同构成独一无二的指纹。

引用此