Observation of Mixed Thermoelectric Power in ThO[sub 2]

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Abstract
Electrical conductivity measurements were made on high purity at temperatures between 1000° and 1600°C and oxygen partial pressures of 10−1 to 10−22 atm. These measurements showed the presence of an oxygen pressure independent region of ionic conductivity at intermediate oxygen pressures and temperatures below about 1400°C, as well as a transition to predominant electron hole conductivity at high oxygen pressures. The Seebeck coefficient was measured over a wide range of oxygen partial pressures in several different gas mixtures at 1000° and 1200°C. The Seebeck coefficient in the region of pure ionic conduction is shown to be a function of the entropy of oxygen in the gas phase, rather than the oxygen partial pressure, as expected for the ionic Seebeck coefficient in the case of a constant ionic defect concentration. The behavior of the Seebeck coefficient in the mixed conduction region is also discussed.

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