Electrical Properties of GeTe-based Ternary Alloys

Yiqi Cao; Zhigang Li; Jianbo Wu; Xiaohua Huang; Shengnan Zhang

doi:10.1007/s11595-018-1847-2

Journal of Wuhan University of Technology Materials Science Edition ›› 2018, Vol. 33 ›› Issue (2) : 472 -475. DOI: 10.1007/s11595-018-1847-2

Metallic Materials

Electrical Properties of GeTe-based Ternary Alloys

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Abstract

Ge_50-xSb_xTe₅₀ and Ge_50-xBi_xTe₅₀ ternary alloys were synthesized by vacuum melting at 1273 K with the starting materials of Ge, Bi, Sb, and Te. The lattice structures were analyzed based on X-ray diffraction patterns, which could all be indexed to R3m rhombic structure. Electrical properties measurements revealed that the Ge-Sb-Te ternary alloys were p-type semiconductors with high electrical conductivity of 4.5×10⁵ S∙m^-1 near room temperature. And the maximum electrical property was obtained at Ge₄₅Sb₅Te₅₀, with the power factor of 2.49×10^-3 W∙m-1K^-2 at 640 K. Due to the existence of secondary phases, the electrical conductivity of Ge-Bi-Te system was lower and Seebeck coefficient was higher comparing with those of Ge-Sb-Te system.

Keywords

thermoelectric materials / melting / ternary alloy / GeTe / thermoelectric property

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Yiqi Cao, Zhigang Li, Jianbo Wu, Xiaohua Huang, Shengnan Zhang. Electrical Properties of GeTe-based Ternary Alloys. Journal of Wuhan University of Technology Materials Science Edition, 2018, 33(2): 472-475 DOI:10.1007/s11595-018-1847-2

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