| abstract |
PROBLEM TO BE SOLVED: To provide an inexpensive thermoelectric element material using an oriented sintered body of a sodium-containing cobalt oxide having thermoelectric properties equivalent to that of a single crystal. A A x B 2 O y (A : Na, Li, K, C a, Sr, Ba, Bi, Y, La, B: Mn, Fe, C o, Ni, Cu, 1 ≦ x ≦ 2, 2 ≦ y ≦ 4) Thermoelectric element material having a type structure. In particular, the NaCo 2 O 4 based thermoelectric element material is obtained by mixing plate-like particles of cobalt hydroxide or cobalt oxide and a sodium metal salt, and molding the mixture so that the cobalt hydroxide or cobalt oxide particles are oriented in one direction. , The compact is fired and densified to produce a sintered body in which the C-axis direction is oriented in one direction. |