Electronic conductivity in nonstoichiometric cerium dioxide |
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Authors: | R.N. Blumenthal R.K. Sharma |
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Affiliation: | Metallurgy and Materials Science, College of Engineering Marquette University, Milwaukee, Wisconsin 53233 USA |
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Abstract: | The electrical conductivity of sintered specimens of nonstoichiometric CeO2?x was measured as a function of temperature (750–1500°C) and oxygen pressure (1–10?22 atm). The isothermal compositional dependence of the electrical conductivity of CeO2?x was determined by combining recently obtained thermodynamic data, x = x(PO2, T), with the conductivity data. The compositional and temperature dependence of the electrical conductivity may be represented by the expressionover the temperature range 750–1500°C and from x = 0.001 to x = 0.1.This expression was rationalized in terms of the following simple relations for (a) the electron carrier concentrationwhere nCe′Ce is the number of Ce′Ce per cm3 and a0 is the lattice parameter and (b) the electron mobility. |
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