Five-elements n-type thermoelectric material realizing powder allow sintering phase transformation based on crystal topology, and preparation method

摘要

A five-elements n-type thermoelectric material realizing powder alloy sintering phase transformation based on crystal topology, and a preparation method. The chemical formula of the n-type thermoelectric material is Bi2-x-ySbxSyTe3-zSez, wherein 0.74 ≤ x ≤ 1.2, 0.04 ≤ y ≤0.06, and 0.2 ≤ z ≤0.45. Compared to other n-type thermoelectric materials, the five-elements n-type thermoelectric material experiences the transformation from a p-type alloy to a p-type powder alloy ingot and then to an n-type thermoelectric material in the preparation process, and the finally obtained five-elements n-type thermoelectric material has the advantages of high Seebeck coefficient, high electrical conductivity, low thermal conductivity coefficient, high ZT value and excellent thermoelectric properties. A thermoelectric chip is manufactured by using a five-elements p-type thermoelectric material and a five-elements n-type thermoelectric material in the five-elements thermoelectric material system, and has good thermoelectric performance and a high thermoelectric conversion rate.