THE ELECTRICAL BEHAVIOR OF REFRACTORY OXIDES.
Abstract
The electrical conductivity of a calcia stabilized zirconia polycrystalline sample was plotted as the logarithm of the conductivity versus reciprocal absolute temperature. The high temperature data lie on a straight line and yield an activation energy of 1.2 ev. Divergence from a straight line at lower temperatures indicates a different conduction mechanism, i.e., electronic which contributes to the total measured value. Transport numbers for electrodes obtained from polarization measurements showed that above 700 C the conductivity is nearly 100% ionic (0 ions). Voltage curves at constant current were taken to determine the transport numbers of a cut of a single crystal of Ti02 and a cut of polycrystalline stabilized zirconia. Results at 500C indicated 79% electronic conductivity in the single crystal and 81% in the sintered ceramic. The time constant of the polarization was shorter in the polycrystalline sample. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 20, 1961
- Accession Number
- AD0263962
Entities
People
- Robert W. Vest