Thermal breakdown in MgO single crystals at high temperatures

Author: Weeks, R. A.
Published: United States : [publisher not identified], 1977.
[Oak Ridge, Tennessee] : [U.S. Atomic Energy Commission], 1977.
Physical Description: microfiche : negative ; 11 x 15 cm
Additional Creators: Kelton, K. F., Narayan, J., Pigg, J. C., and Sonder, E.

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Summary

Electric conductivities of pure MgO single crystals were measured in air at voltages of 6, 12, and 22.5 volts. Measurements were made on samples as received, after a 100 hour anneal at 1373K and after a 1000 V/cm applied field for 20 hours at 1473K. Results of electron microscopy indicate that (1) initial decrease in conductivity with application of a moderate electric field is probably related to reduction of trivalent impurities, (2) the conductivity after reduction is in part due to sub-grain boundary structure, and (3) changes in the sub-grain boundaries are correlated with the increased current flow. (SDF)

Report Numbers

CONF-770411-3

Other Subject(s)

Collection

U.S. Atomic Energy Commission depository collection.

Note

DOE contract number: W-7405-ENG-26
OSTI Identifier 5243180
Research organization: Oak Ridge National Lab., Tenn. (USA).

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