Ag1-xCuSe thermoelectric material and preparation of Ag1-xCuSe thermoelectric material and application of same

Abstract

The invention relates to an Ag1-xCuSe (x=0.01-0.03) thermoelectric material and preparation of the Ag1-xCuSe thermoelectric material and application of the Ag1-xCuse thermoelectric material. An Ag1-xCuSe molten mass is synthesized by the adoption of a high temperature solid state method, the acquired molten mass is grinded into to powder bodies, and a target block material can be acquired by hot pressing sintering of the powder bodies. A thermoelectric figure of merit ZT of an Ag1-xCuSe thermoelectric material with an Ag vacancy reaches up to 1.4, is about 0.6 within a high-temperature range, and hardly changes along with temperatures. The Ag1-xCuSe (x=0.01-0.03) thermoelectric material can be used for manufacturing efficient heat-electricity conversion devices.

Description

technical field [0001] The invention belongs to the field of material science, and relates to the preparation and application of a high-efficiency thermoelectric material. Background technique [0002] Thermoelectric materials are materials that can directly convert heat and electricity, and the thermoelectric figure of merit ZT is usually used to evaluate the performance of thermoelectric materials. , where S is the Seebeck coefficient and σ is the conductivity? is the thermal conductivity and T is the absolute temperature. In practical applications, the thermoelectric efficiency of a single pair of thermoelectric devices is . At present, the most researched thermoelectric materials in the world are mainly semiconductors and their alloys, such as Bi 2 Te 3 Base material, PbTe base material, AgSbTe 2 and (AgSbTe 2 ) 1-x (GeTe) x Solid solution, metal silicide (Mg / Mn / Fe), and SiGe alloy, etc. In the 1990s, a class of materials collectively referred to as "phonon ...

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Problems solved by technology

Based on the reported research, we changed the carrier concentration by adjusting the Ag vacancies in the AgCuSe system to optimize the thermoelectric figure of merit ZT. Through experiments, we found that when the Ag vacancy content was 0.03, the ZT value reached near the superionic phase transition temperature A maximum value is about 1.4, and the ZT values ​​of different Ag vacancies are basically unchanged with temperature in the high-temperature cubic phase, which is of great significance for practical applications, and related work has not been reported in the literature so far

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