THERMOELECTRIC-POWER OF ERAL(MG)O-3-DELTA AND LAAL(MG)O-3-DELTA

Thermoelectric power and electrical conductivity of LaAl0.95Mg0.05O3-d elta and ErAl0.95Mg0.05O3-delta have been determined as a function of oxygen partial pressure between 1 and 10(-15) atm at 1000 degrees C an d as a function of temperature in air and in a hydrogen-water buffer. In oxidizing atmospheres these compounds are found to be p-type conduc tors and in reducing atmospheres ionic conductors. The thermoelectric power at 1000 degrees C depends strongly on oxygen partial pressure. I n both reducing and oxidizing atmospheres the thermoelectric power dep ends on temperature. In this work a new method for calculating ionic t ransference numbers directly from measurements of the thermoelectric p ower is discussed.