THERMOELECTRIC CONVERSION MATERIAL AND THERMOELECTRIC CONVERSION ELEMENT

摘要

Disclosed is a thermoelectric conversion material which is stable in thermoelectric conversion properties including a power factor under a practical environment in a high-temperature air. The thermoelectric conversion material comprises a composite metal oxide comprising M<SUP>1</SUP>, M<SUP>2A</SUP> and M<SUP>2B</SUP>as metal elements at a ratio (i.e., M<SUP>1</SUP>:M<SUP>2A</SUP>:M<SUP>2B</SUP>) of 2:1:1 by mole and having a perovskite-type crystal structure, wherein M<SUP>1</SUP>represents at least one member M<SUP>1A</SUP>selected from the group consisting of La, Y and lanthanide elements or a combination of M<SUP>1A</SUP>and at least one member M<SUP>1B</SUP>selected from alkaline earth metal elements, M<SUP>2A</SUP> represents at least one member selected from the group consisting of metal elements each of which can have a valency of 2, M<SUP>2B</SUP>represents at least one member selected from the group consisting of metal elements each of which can have a valency of 4, M<SUP>1</SUP>, M<SUP>2A</SUP>and M<SUP>2B</SUP>are different from one another, and each of M<SUP>2A</SUP>and M<SUP>2B</SUP>may contain a doping element.