High Temperature Electrical Conductivity Measurement Techniques.
Final rept. 27 Apr 71-26 Apr 72,
NATIONAL BUREAU OF STANDARDS WASHINGTON D C
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The report deals with experiments aimed at a critical evaluation of electrical conductivity measurements on semiconducting and semi-insulating materials above 1500C. An initial study was made of the differential thermionic emission between two Pt-electrodes as a function of applied voltage, temperature and gas environment Double-diode. Subsequent experiments on alumina and sapphire used a novel geometry, eliminating surface and gas conduction. Current densities in the range 1400-1650C appeared to be of the same order of magnitude as those observed between two Pt-electrodes in vacuum. The suggestion is made that the current through the oxide is determined by the difference between the thermionic emissions from the electrodes into the sample under small applied voltage. Author
- Test Facilities, Equipment and Methods
- Solid State Physics