Effect of Metal Oxide Additions on the High-Temperature Electrical Conductivity of Alumina |
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| Authors: | R A VERNETTI R L COOK |
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| Affiliation: | Department of Ceramic Engineering, University of Illinois, Urbana, Illinois 61803 |
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| Abstract: | Several metal oxide additions were made to typical 99 and 96% alumina compositions to study their effect on the electrical conductivity of alumina from 500° to 1400°C. The metal oxide additions investigated were CO2O3, Cr2O3, CuO, Fe2O3, MnO2, NiO, and TiO2. Using a guarded two-probe technique, dc resistivities were measured on nonporous ceramic specimens. Additions of 0.5 to 2 mole % Co2O3, 2 mole % CuO, 1 mole % Fe2O3, or 2 mole % NiO to either a 96 or a 99% alumina composition increased the electrical resistivity. The addition of 1 mole % Cr2O3 to either a 96 or a 99% alumina showed practically no change in the resistivity. All changes in resistivity seemed to be structure dependent. |
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