Abstract
Grain-boundary migration during the dissolution of a liquid phase in Ba(Zn 1/3Nb 2/3)O 3 (BZN) ceramics has been investigated. When the BZN specimens sintered at 1550°C are further heat-treated at lower temperatures, the liquid phase formed during sintering is dissolved discontinuously and grain boundaries migrate. With the increase of heat-treatment temperature, grain-boundary migration becomes much less pronounced. These results are consistent with the coherency strain energy model proposed for the driving force for diffusion-induced grain boundary migration (DIGM).
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