a cubic phase cu 3 sbs 3 Base thermoelectric material and preparation method thereof

Abstract

The present invention relates to a Cu 3 Sb 3 Based thermoelectric material, characterized in that it is a cubic phase with a chemical composition of Cu 3 Sb 1‑x Fe x S 3 , where x is 0.05-0.20. Its preparation method mainly comprises the following steps: 1) batching: according to chemical composition Cu 3 Sb 1‑x Fe x S 3 The stoichiometric ratio of each element in the method takes copper, antimony, iron, and sulfur as the reaction raw materials, wherein x is 0.05 to 0.30; 2) mechanical alloying: the reaction raw materials in step 1) are subjected to high-energy ball milling under an inert gas protective atmosphere , the obtained powder is subjected to spark plasma sintering or hot pressing sintering to obtain high-density and high-performance single-phase cubic phase Cu 3 Sb 3 bulk thermoelectric material. The raw material of the present invention is stable, the process is simple and controllable, the preparation cost is low, and the repeatability is good, and the prepared cubic phase Cu 3 Sb 1‑ x Fe x S 3 Thermoelectric materials have high density, pure phase, stable thermodynamic performance and excellent thermoelectric performance.

Description

technical field [0001] The invention belongs to the field of new energy materials, in particular to a cubic phase Cu 3 Sb 3 Based thermoelectric materials and their preparation methods. Background technique [0002] Thermoelectric power generation technology is an energy conversion technology that uses the thermoelectric effect (Seebeck effect) of thermoelectric materials to realize direct conversion between thermal energy and electrical energy. The working efficiency and application prospects of thermoelectric devices not only depend on the performance value ZT of thermoelectric materials (the characterization parameter of the comprehensive thermoelectric performance of materials), but also are closely related to the price of raw materials and the thermodynamic stability of the materials themselves. Due to the toxicity of lead element, the current commercial medium-temperature thermoelectric material, lead telluride, is gradually withdrawing from the market. In order to ...

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Problems solved by technology

Experimentally, although Zhong et al. synthesized cubic Cu by solvothermal method 3 Sb 3 Nanorods, Maiello et al. synthesized Cu on glass substrates by a two-step method (magnetron sputtering + vulcanization process) 3 Sb 3 However, since both products are metastable, it is inevitable that the sample will gradually change from the metastable cubic phase to the monoclinic or orthorhombic stable phase under service conditions.

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