| 摘要 |
<P>PROBLEM TO BE SOLVED: To inexpensively provide a sintered compact of lanthanoid sesquisulfide for thermoelectric conversion element having a large Seebeck coefficient by solving the problem pursuant to the raw material of the sesquisulfide. <P>SOLUTION: A thermoelectric conversion material composed of a sintered compact of Ln<SB>2</SB>S<SB>3</SB>powder is manufactured by mixing platinum powder in the powder of β-type lanthanoid sesquisulfide containing oxygen as an impurity at a rate of ≥0.9 mass% and expressed by the compositional formula of Ln<SB>2</SB>S<SB>3</SB>(wherein, Ln denotes at least one kind selected from a group of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) and sintering the mixed powder after or while the powder is molded in the temperature range of 1,300-1,700°C. The sintered compact contains the β-type lanthanoid sesquisulfide as the main component in its crystal structure. Consequently, the thermoelectric conversion material having a Zeebeck coefficient of ≥1,000 μV/K at 60°C is obtained. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
