| 摘要 |
A composite oxide having a negative Seebeck coefficient at 100°C or higher, which composite oxide has a composition represented by the general formula: Ln1-xMxNiOy(wherein Ln is a lanthanide element; M is at least one element selected from the group consisting of non-Ln rare earth elements, Na, K, Li, Zn, Pb, Ba, Ca, Al and Bi; and x and y are such that 0<=x<=0.8 and 2.7<=y<=3.3), or the general formula: (Ln1-xMx)2NiOy (wherein Ln is a lanthanide element; M is at least one element selected from the group consisting of non-Ln rare earth elements, Na, K, Li, Zn, Pb, Ba, Ca, Al and Bi; and x and y are such that 0<=x<=0.8 and 3.6<=y<=4.4). This composite oxide is one having a negative Seebeck coefficient and a low electrical resistivity and excelling in heat resistance and chemical durability. This composite oxide can be effectively used as an n-type thermoelectric conversion material exposed to high-temperature air.
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