| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermoelectric conversion material and a thermoelectric conversion element which has increased mechanical strength while keeping the figure of merit of a Bi-Te-based thermoelectric material. SOLUTION: When a Bi-Te-based thermoelectric conversion material having a uniaxial temperature gradient applied thereto is cooled upon melting and solidifying the thermoelectric conversion material, the material exhibits a specific value of X-ray diffraction intensity ratio of reflection on a specific surface perpendicular to the temperature gradient direction when measured, and thus the figure of merit can be increased. When a ratio between the full length of an element having metallic materials positioned at both end faces of the thermoelectric conversion material and the length of the thermoelectric conversion material is set at a specific value, electric resistivityρis reduced in the entire element, a Seebeck coefficient is remarkably increased by the interface effect between the metal material and the thermoelectric conversion material and by the metal heatsink effect to thereby increase power generation efficiency. COPYRIGHT: (C)2007,JPO&INPIT
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