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Polarization studies with thorium oxide

✍ Scribed by W.E. Danforth

Publisher: Elsevier Science
Year: 1958
Tongue: English
Weight: 462 KB
Volume: 266
Category: Article
ISSN: 0016-0032
DOI: 10.1016/0016-0032(58)90215-1

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✦ Synopsis

Studies of electrical polarization resulting from passage of current in single crystals of thorium oxide in the 600°-1300 ° C. region have been extended to detailed measurements of the initial rate of rise of such polarization. An attempt is made to deduce therefrom the density and mobility of charge carriers. Existing theoretical papers on the subject are briefly discussed. Reasonable values of carrier density are obtained but mobility values appear to be too low and to vary with temperature in the wrong sense. Probe measurements show that, for values of time less than one minute, the development of polarization EMF is confined to regions near the electrodes; for long times the polarization becomes more uniformly distributed throughout the crystal. Studies with constant voltage applied to a crystal show that, above a critical value of voltage, an instability develops in which the current increases to large values.

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