SHS synthesis of thermoelectric materials: thermodynamic criterion for combustion synthesis Текст научной статьи по специальности «Химические науки»

iSHS 2019

Moscow, Russia

SHS SYNTHESIS OF THERMOELECTRIC MATERIALS: THERMODYNAMIC CRITERION FOR COMBUSTION SYNTHESIS

X. Tang*", X. Sua, and Y. Yana

aState Key Laboratory of Advanced Technology for Materials Synthesis and Processing,

Wuhan University of Technology, Wuhan, 430070 China

*e-mail: tangxf@whut.edu.cn

DOI: 10.24411/9999-0014A-2019-10172

Here we report compound thermoelectric materials (Bi2Te3, Bi2Se3, Cu2Se, Cu2SnSe3, half-Heusler alloys, lead chalcogenides, skutterudites, and magnesium silicides) with thermoelectric properties comparable with materials prepared by the traditional routes of synthesis can be synthesized at a minimal cost and on the time scale of seconds using the self-propagating high temperature synthesis method. Moreover, we found that the criterion often quoted in the literature as the necessary precondition for combustion synthesis, Tad > 1800 K, is not universal and certainly not applicable to thermoelectric compound semiconductors. Instead, we offer new empirically-based criterion, which covers all materials synthesized by self-propagating high temperature synthesis, including the high temperature refractory compounds for which the Tad > 1800 K criterion was originally developed. Our work opens a new avenue for ultra-fast, low cost, mass production fabrication of efficient thermoelectric materials and the new criterion greatly broadens the scope of materials that can be successfully synthesized by self-propagating high temperature synthesis.

X. Tang et al.

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