Year: 2000
Type: article
Abstract: Pb1-xSnxTe solid-solutions (0_??_x_??_1) were prepared by the unidirectional solidification process with a rocking furnace. The obtained Pb1-xSnxTe solid-solutions, which were all p-type, were homogeneous without segregation. Pb1-xSnxTe solid-solutions (0_??_x_??_0.40) was characterized below 800K by its maximum figure-of-merit Zmax that shifted to high temperature with increasing x, while Pb0.35Sn0.65Te showed the monotonous increase of Z with increasing temperature. The high average figure-of-merit Zav was exhibited by Pb0.60Sn0.40Te and Pb0.35Sn0.65Te at low and high temperatures, respectively. When the joined material of Pb0.60Sn0.40Te and Pb0.35Sn0.65Te, which is referred to as functionally graded material (FGM), is applied under the temperature gradient of 300-800K, the Zav is 1.28×10-3K-1; this value is higher by 11 and 91% than the Zav of the monolithic Pb0.60Sn0.40Te and Pb0.35Sn0.65Te. Thus the maximum conversion efficiency ηmax of FGM reaches 11.37%, which is improved by 11 and 69% when compared with Pb0.60Sn0.40Te and Pb0.35Sn0.65Te, respectively. It is clarified that FGM can perform the high Zav, leading to the high ηmax.
Institutions: Niigata University, Kogakuin University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2516922996