1J01 多結晶酸化セリウムの粒界溝発達の AFM による研究

概要

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CeO_2 powder prepared by homogeneous precipitation method was sintered to reach about 98% relative density of its theoretical. The polycrystalline CeO_2 finely polished was used to develop thermal grain boundary groove at different temperatures (1200℃∿1390℃) and times (30min∿480min) in air. An AFM (atomic force microscope) was used to measure the width W of the developed grain boundary grooves in the annealed polycrystalline CeO_2. It was found that log W-log t relationships are approximately linear, having slopes of approximately 1/4. According to Mullins' formula the grain boundary grooving is controlled by surface diffusion. Finally, the surface diffusion coefficients were determined, and the mechanism of transportation was discussed.
1999-10-06