| abstract |
The present invention is the formula La 1-x M x NiO 2.7 ~ 3.3 (wherein M is at least one element selected from the group consisting of Na, K, Li, Zn, Pb, Ba, Ca, Al, Nd, Bi and Y) And a composition represented by 0.01 ≦ x ≦ 0.8 or a compound represented by the formula (La 1-x M x ) 2 NiO 3.6 to 4.4 (wherein M and x are the same as above), and 100 ° C. It is to provide a composite oxide having a negative Seebeck coefficient at the above temperature. The composite oxide is a novel material having excellent performance as an n-type thermoelectric conversion material.n n n n n-type thermoelectric conversion material, composite oxide, thermoelectric power module |