Thermoelectric materials

Abstract

Disclosed herein is a thermoelectric material for intermediate- and low-temperature applications, in which any one or a mixture of two or more selected from among La, Sc and MM is added to a Ag-containing metallic thermoelectric material or semiconductor thermoelectric material. The thermoelectric material has a low thermal diffusivity, a high Seebeck coefficient, a low specific resistivity, a high power factor and a low thermal conductivity, and thus has a high dimensionless figure of merit, thus showing very excellent thermoelectric properties. The thermoelectric material provide thermoelectric sensors having high sensitivity and low noise and, in addition, is widely used as a thermoelectric material for intermediate- and low-temperature applications, because it shows excellent thermoelectric performance in the intermediate- and low-temperature range.

Description

technical field [0001] The invention relates to a thermoelectric material, in particular to a thermoelectric material for medium and low temperature with good thermoelectric performance. Background technique [0002] Generally speaking, thermoelectric conversion technology includes two application fields: thermoelectric cooling and thermoelectric power generation. Thermoelectric cooling mainly utilizes the Peltier effect in which heat moves from one side of the thermoelectric conversion material to the other when an electric current is applied, and thermoelectric power generation mainly utilizes the Seebeck effect in which an electromotive force is generated when a temperature difference occurs between the two ends of the conversion material. The development of thermoelectric cooling focuses on cooling effect rather than energy utilization, so many application fields have been expanded and extensive research has been carried out; It is difficult to secure economic efficienc...

AI Technical Summary

Problems solved by technology

Compared with other metal substances, the above-mentioned metal thermoelectric materials have lower thermal conductivity and higher Seebeck coefficient, but higher specific resistance, so when used in thermal sensors and other fields, the sensitivity is low and a lot of noise is generated

[0009] Existing thermoelectric materials are mainly used in low-temperature regions (below 100°C), and their thermoelectric properties will weaken when they enter the medium-temperature region (100°C-300°C)

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