The filled skutterudite compounds, M
yFe
xCo
4-xSb
12 (x=0-1.0, y=0-0.15, M=Ce, La, Y), were prepared by a new solid state reaction method using Co, Fe, Sb, CeCl
3.6H
2O, LaCl
3.6H
2O and YCl
3.6H
2O powders, and their thermoelectric properties were investigated. M
yFe
xCo
4-xSb
12 (x=0-1.0, y=0-0.15, M=Ce, La, Y) compounds showed p-type conduction. The electrical conductiviy (σ) increased with increasing Fe content. The Seebeck coefficient (α) increased with increasing Fe content for MFe
xCo
4-xSb
12, but decreased with increasing Fe content for Fe
xCo
4-x, Sb
12. The Lattice thermal conductivity (KL) decreased significantly with the substitution of Fe for Co and the filling of M (M=Ce, La, Y) into the Sb icosahedral voids, while the carrier thermal conductivity (Kcar) was not much affected by the Fe substitution and the M (Ce, La, Y) filling. The thermoelectric figure of merit was improved by the combinatior of Fe substitution and M (Ce, La, Y) filling.
抄録全体を表示