Title :
Temperature dependence of the figure-of-merit of Ag0.208Sb0.275Te0.517
Author :
Yoneda, S. ; Ohno, Y. ; Ohta, E. ; Yuhashi, N. ; Shiota, I. ; Shinohara, Y. ; Kaibe, H.T. ; Nishida, I.A.
Author_Institution :
Kanagawa Univ., Japan
Abstract :
The p-type Ag0.208Sb0.275Te0.517 boule was unidirectionally grown using a Bridgman furnace and subsequently rapidly cooled by Ar to form a Widmannstatten structure of a high temperature phase AgSbTe2, which could be desirable for power generation. Though the boule looked a homogeneous Widmannstatten structure, XRD patterns revealed that some precipitates of Ag2Te and Sb2Te3 were contained in the boule and increased in volume in the growth direction. The figure-of-merit Z of the p-type Ag0.208Sb0.275Te0.517 boule have been evaluated in the temperature range from 300 to 700 K. The maximum figure-of-merit Zmax was different in the portions of the boule. The value of 2.0×10-1/K was at 620 K for the former half portion of the boule and that of 1.7×10-3/K was at 585 K for the latter half portion. The Ag0.208Sb0.275Te0.517 boule with less precipitates showed higher Z at higher temperatures.
Keywords :
X-ray diffraction; antimony compounds; precipitation; semiconductor materials; silver compounds; thermoelectricity; 300 to 700 K; Ag0.208Sb0.275Te0.517; Bridgman furnace; Widmannstatten structure; XRD; figure-of-merit; figure-of-merit Z; precipitates; rapid cooling; temperature dependence; Atmospheric measurements; Conductivity measurement; Electric variables measurement; Force measurement; Tellurium; Temperature dependence; Temperature distribution; Thermal conductivity; Thermoelectricity; Velocity measurement;
Conference_Titel :
Thermoelectrics, 2002. Proceedings ICT '02. Twenty-First International Conference on
Print_ISBN :
0-7803-7683-8
DOI :
10.1109/ICT.2002.1190294
