HIGHLY ORIENTATIONAL POLYCRYSTAL CERAMICS AND ITS MANUFACTURING METHOD AND THERMOELECTRIC CONVERSION ELEMENT

摘要

PROBLEM TO BE SOLVED: To provide highly orientational polycrystal ceramics which are made of a cobalt layer-like oxide indicating excellent thermoelectric characteristics and which shows a high figure of merit and to provide a method for manufacturing the same and a thermoelectric conversion element using such a highly orientational polycrystal ceramics.

SOLUTION: The highly orientational polycrystal ceramics contains the polycrystal material of the cobalt layer-like oxide. A rocking curve half width of the cobalt layer-like oxide in plane ä001} is 15 degrees or less. The method for manufacturing the ceramics comprises the steps of: preparing a raw material containing a first powder having a crystal surface A having lattice matching properties with CoO2layer of the oxide, molding the material so that an orientation degree according to a Lotgerig method of the surface A is 55% or more, and heating the obtained molding to a predetermined temperature.

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