| 摘要 |
PROBLEM TO BE SOLVED: To provide a new material which is composed of elements abundantly existing but having respectively low toxicities and is excellent in its heat resistance and its chemical durability, etc., and further, has a high Seebeck coefficient and good electric conductivity. SOLUTION: By melting and cooling rapidly the raw material obtained by mixing each other in a specific ratio a Bi compound, a Pb compound, an Sr compound, a Ca compound, and a Co compound, a solid material is obtained. Then, by subjecting the solid material to a heat treatment in an oxygen atmosphere, there is grown as a fiber-form single crystal a composite oxide having an excellent thermoelectric conversion performance which is represented by the chemical formula of Bi1.6-2.2Pb0-0.25Sr1.1-2.2Ca0-0.8Co2O9-x (0<=x<=1).
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