| abstract |
A composite oxide of the composition of the formula: LavM<1>wNixM<2>yOz (wherein M<1> is at least one element selected from the group consisting of Na, K, Sr, Ca, Bi and Nd; M<2> is at least one element selected from the group consisting of Ti, V, Cr, Mn, Fe, Co and Cu; and the indexes are numbers satisfying the relationships 0.5 & v & 1.2, 0 & w & 0.5, 0.5 & x & 1.2, 0.01 & y & 0.5 and 2.8 & z & 3.2). This composite oxide exhibits an electric resistivity of 10 m L cm or below and a negative Seebeck coefficient at 100{ or higher and provides a novel material exhibiting excellent performance as an n-type thermoelectric conversion material. |