High Temperature Thermoelectric Properties of Ca1-xYxMnO2.98 (0.05≤x≤0.30)
Year: 2004
Type: article
Abstract: High temperature thermoelectric properties of Ca 1-x Dy x MnO 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 x MnO 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 8+ ions, and the absolute value of Seebeck coefficient (a) 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.
Institution: Japan Advanced Institute of Science and Technology
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W920129354