Ca-Co-O系層状構造酸化物配向セラミックスの異方的熱電特性

概要

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Anisotropic thermoelectric properties of crystal-axis oriented polycrystals of layer-structured oxide in the Ca-Co-O system was discussed. Plate-like particles of (Ca_<2.7>Bi_<0.3>)(Co_<3.7>Cu_<0.3>)O_<9+δ> were synthesized. To improve the thermoelectric properties, a c-axis oriented polycrystal of Ca_<2.7>Bi_<0.3>)(Co_<3.7>Cu_<0.3>)O_<9+δ> was successfully fabricated by uniaxial-pressing and sintering. The elecreical conductivity along the ab-plane was about four times larger than that along the c-axis, while the Seebeck coefficients were similar. The thermal conductivity along the ab-plane was more than two times larger than that along the c-axis. The resulting figure-of-merit along the ab-plane was enhanced due to the enhanced electrical conductivity.
社団法人日本セラミックス協会の論文
2001-08-01