Ca_<1-x>Dy_xMnO_<2.98> (0≤x≤0.2)の高温熱電特性

概要

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High temperature thermoelectric properties of Ca_<1-x>Dy_xMnO_<2.98> (x = 0, 0.05, 0.10, 0.15, 0.20) have been measured in the temperature range from 300 to 1273 K. Ca_<1-x>Dy_xMnO_<2.98> (x = 0.10, 0.15, 0.20) exhibited the metal-insulator transition in the relation between electrical resistivity and temperature, and the transition temperature increased with increasing x. Electrical resistivity in the metallic region decreased with increasing x content, reflecting the increase of Mn^<3+> ions, and the absolute value of Seebeck coefficient (α) also decreased. Thermal conductivity (λ) did not considerably change with increasing x content. Among substituted CaMnO_3, the highest figure of merit of Z = 1.05 × 10^<-4> K^<-1> was obtained for x = 0.05 and 0.10 at 773 K, while a Z = 1.63 × 10^<-4> K^<-1> was obtained for x = 0.20 at 1273 K.
社団法人日本セラミックス協会の論文
2003-08-01