Accession Number : AD0263962

Title :   THE ELECTRICAL BEHAVIOR OF REFRACTORY OXIDES.

Descriptive Note : Bimonthly progress rept. no. 4,

Corporate Author : SYSTEMS RESEARCH LABS INC DAYTON OHIO

Personal Author(s) : Vest,Robert W.

Report Date : 20 SEP 1961

Pagination or Media Count : 12

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)

Descriptors :   *CERAMIC MATERIALS, *CRYSTALS, *ELECTRICAL CONDUCTIVITY, *REFRACTORY MATERIALS, *SINGLE CRYSTALS, *TITANIUM COMPOUNDS, *ZIRCONIUM COMPOUNDS, ALUMINUM COMPOUNDS, CHLORIDES, DIOXIDES, ELECTRODES, ELECTRONS, HIGH TEMPERATURE, IMPURITIES, IONS, LABORATORY EQUIPMENT, OXIDES, PLATINUM, PREPARATION, SAPPHIRE, SODIUM COMPOUNDS, TEST METHODS

Distribution Statement : APPROVED FOR PUBLIC RELEASE