Extruded Bismuth-Telluride-Based <Emphasis Type="Italic">n</Emphasis>-Type Alloys for Waste Heat Thermoelectric Recovery Applications期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Extruded Bismuth-Telluride-Based <Emphasis Type="Italic">n</Emphasis>-Type Alloys for Waste Heat Thermoelectric Recovery Applications

Authors:	C André D Vasilevskiy S Turenne R A Masut

Affiliation:	(1) école Polytechnique de Montréal, C.P. 6079, Succ. Centre-Ville, Montreal, Quebec, H3C 3A7, Canada

Abstract:	Thermoelectric (TE) generator modules for a number of waste heat recovery applications are required to operate between room temperature and 500 K, a temperature range for which the composition of bismuth-telluride-based alloys needs to be adjusted to optimize performance. In particular n-type alloys do not perform as well as p-type and require a more systematic study. We have produced, by mechanical alloying followed by hot extrusion, $( {\hbox{Bi}}_{ ( 1- x )} {\hbox{Sb}}_{x} )_{ 2} ( {\hbox{Te}}_{ ( 1- y )} {\hbox{Se}}_{y} )_{ 3}$ alloys, within the range $0 \le x, y \le 0.1,$ with fixed carrier concentration ( $n = 2 \times 10^{19}\,{\hbox{cm}}^{ - 3}$ ) to optimize their TE performance in the temperature range 300 K to 420 K. The optimum composition has been identified to be and which is very close to the composition that also maximizes the ratio of the electron mobility to the lattice component of the thermal conductivity. The optimized alloy performance can be further increased by adjusting the carrier concentration.

Keywords:	Thermoelectricity bismuth telluride powder metallurgy hot extrusion waste heat recovery figure of merit carriers mobility lattice thermal conductivity
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