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):

Report Date:

1961-09-20

Pagination or Media Count:

12.0

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

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE