Thermoelectric Power Generation Characteristics of the (Pb,Sn)Te/(Bi,Sb)2Te3 Functional Gradient Materials with Various Segment Ratios
Year: 2002
Type: article
Abstract: 0.5 at% $Na_2$ Te-doped ( $Pb_{0.7}Sn_{0.3}$ )Te and ( $Bi_{0.2}Sb_{0.8}$ ) $_2$ $Te_3$ powders were fabricated by mechanical alloying process. 0.5 at% Na $_2$ Te-doped ( $Pb_{0.7}Sn_{0.3}$ )Te powders were charged at one end of mold and ( $Bi_{0.2}Sb_{0.8}$ ) $_2$ $Te_3$ powders were charged at the other end of a mold. Then these powders were hot-pressed to form p-type ( $Pb_{0.7}Sn_{0.3}$ )Te/( $Bi_{0.2}Sb_{0.8}$ ) $_2$ $Te_3$ functional gradient materials with the segment ratios (the ratio of ( $Pb_{0.7}Sn_{0.3}$ )Te to ( $Bi_{0.2}Sb_{0.8}$ ) $_2$ $Te_3$ ) of 1:2, 1:1, and 2:1. Power generation characteristics of the ( $Pb_{0.7}Sn_{0.3}$ )Te/( $Bi_{0.2}Sb_{0.8}$ ) $_2$ $Te_3$ were measured. When the temperature difference ΔT at both ends of the specimen was larger than $300^{\circ}C$ , the ( $Pb_{0.7}Sn_{0.3}$ )Te/( $Bi_{0.2}Sb_{0.8}$ ) $_2$ $Te_3$ with the segment ratios of 1:2 and 1:1 exhibited larger output power than those of the ( $Bi_{0.2}Sb_{0.8}$ ) $_2$ $Te_3$ and 0.5 at% $Na_2$ Te-doped ( $Pb_{0.7}Sn_{0.3}$ )Te alloys. The maximum output power of the ( $Pb_{0.7}Sn_{0.3}$ )Te/( $Bi_{0.2}Sb_{0.8}$ ) $_2$ $Te_3$ predicted with the measured Seebeck coefficient and the estimated electrical resistivity was in good agreement with the measured maximum output power.
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W842219040