THE ELECTRICAL BEHAVIOR OF REFRACTORY OXIDES
SYSTEMS RESEARCH LABS INC DAYTON OHIO
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A study was begun on the electrical properties of refractory oxides. Initial measurements to be made on single crystals and polycrystalline ZrO2 will include electrical conductivity, thermoelectric power, dielectric constant, and polarization voltages. A hot press is being designed for operation in vacuum or an inert atmosphere at 2000 C and 4000 psi. By replacing the die with a W susceptor, the unit can be converted to a high-temperature vacuum furnace. Preliminary studies were made of the preparation of dense ZrO2 by hydrostatic pressing 4000 to 17,000 psi and sintering in vacuum at 1800 to 1950 C. An attempt will be made to grow single crystals from the vapor phase of the reaction between ZrCl4 and oxygen near 1000 C. Details are presented of an experimental apparatus for the measurement of electrical conductivity, dielectric constant, and thermoelectric power. Fast and slow polarization voltage measurements will be made initially on single crystal sapphire with the apparatus for conductivity measurements.