THE ELECTRICAL BEHAVIOR OF REFRACTORY OXIDES
SYSTEMS RESEARCH LABS INC DAYTON OHIO
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POLYCRYSTALLINE SAMPLE PREPARATION Dense, well sintered ZrO2 disks were prepared by cold pressing and firing in vacuum to 2000 C or higher. With increase in temperature, an increase in the degree of oxygen deficiency was indicated by change in color from white through grey to black. The level of 0 deficiency is to be established by the weight gain after complete reoxidation. Reoxidation experiments indicated that samples fired in vacuum at different soaking times do not exhibit the same behavior during reoxidation. PREPARATION OF SINGLE CRYSTAL ZIRCONIA An apparatus was constructed which provides for visual observation of the seed during growth by means of a projection system and a light path through the center of a tube furnace modified to have a 14-in. gap in the winding at the center. An oxidation-reduction reaction is to be conducted between ZrC14 and 0. The optical system consists of a converted slide projector, quartz rods with polished rods for light pipes, and several lenses the beam from the light source illuminates the seed from below, an enlarged shadow image of the seed being projeced on a screen.