It is shown that oxide ceramics based on the layered calcium or sodium cobaltites (p-type conductors) and barium–strontium plumbates (n-type conductors) possess good thermoelectric characteristics and may be used in high-temperature thermoelectric converters. So, for the Ca2,8Er0,2Co4O9+, Na0,89Co0,9Ni0,1O2 and Ba0,2Sr0,8Pb1,1O3,2 samples power factor and figure-of-merit values ...