A kind of high-temperature solid state reaction method prepares the method for fesb2

Abstract

Preparation of FeSb by a high-temperature solid-state reaction method 2 The method is characterized in that, according to the chemical formula FeSb 2 The stoichiometric ratio of Fe powder and Sb powder is taken, and the mixture is vacuum ball milled in a ball mill tank, and then the powder is taken out and pressed into shape, assembled with a sintering mold, and sintered in a solid state reaction in a vacuum atmosphere furnace. In the temperature range of 773 ~ 923K, the present invention utilizes high temperature solid state reaction method to investigate FeSb 2 rules of preparation. The prepared samples were analyzed by XRD and SEM, and the resistivity and Seebeck coefficient of the samples were tested and analyzed. The results show that under the preparation conditions of 610 ° C for 3 h, the single-phase polycrystalline compound FeSb can be synthesized 2 . Inhomogeneous micron-scale pores exist inside the prepared samples. The sample obtained the maximum Seebeck coefficient of 36.34μV / k when the test temperature was 923.15K, and obtained the maximum power factor of 185.89μW / (m k 2 ).

Description

technical field [0001] The invention belongs to the technical field of thermoelectric materials, in particular to a high-temperature solid-phase reaction method for preparing FeSb 2 Methods. Background technique [0002] Thermoelectric materials are semiconductor functional materials that enable direct conversion of heat and electricity. Thermoelectric materials have become one of the research hotspots in the field of functional materials because of their wide application prospects. The thermoelectric properties of thermoelectric materials are generally characterized by the dimensionless thermoelectric figure of merit ZT value (ZT=S 2 σT / λ. In the formula, S, σ, λ and T are respectively the Seebeck coefficient, electrical conductivity, thermal conductivity and absolute temperature) to measure the performance of thermoelectric materials. Generally, thermoelectric materials with high thermoelectric properties need to have high Seebeck coefficient, high electrical conductiv...

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Problems solved by technology

The traditional preparation methods all have the characteristics of long preparation and annealing cycles, and relatively complicated preparation processes.

The high temperature and high pressure preparation method has the advantages of accelerating the reaction rate and effectively preventing phase segregation, but requires special equipment to generate high pressure conditions

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