Effect of interface structure on the microstructural evolution of ceramics
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- Effect of interface structure on the microstructural evolution of ceramics
- Jo, Wook; Kim, Doh-Yeon; Hwang, Nong-Moon
- ABNORMAL GRAIN-GROWTH; SCANNING-TUNNELING-MICROSCOPY; EQUILIBRIUM CRYSTAL SHAPES; SUPPORTED METAL-CATALYSTS; OXYGEN PARTIAL-PRESSURE; UNSTABLE NECK FORMATION; PERCENT PBTIO3 CERAMICS; BARIUM-TITANATE GRAINS; PHASE-SINTERED ALUMINA; PLANE REENTRANT EDGE
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- JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.89, no.8, pp.2369 - 2380
- The interface atomic structure was proposed to have a critical effect on microstructure evolution during sintering of ceramic materials. In liquid-phase sintering, spherical grains show normal grain growth behavior without exception, while angular grains often grow abnormally. The coarsening process of spherical grains with a disordered or rough interface atomic structure is diffusion-controlled, because there is little energy barrier for atomic attachments. On the other hand, kink-generating sources such as screw dislocations or two-dimensional (2-D) nuclei are required for angular grains having an ordered or singular interface structure. Coarsening of angular grains based on a 2-D nucleation mechanism could explain the abnormal grain growth behavior. It was also proposed that a densification process is closely related to the interface atomic structure. Enhanced densification by carefully chosen additives during solid state sintering was explained in terms of the grain-boundary structural transition from an ordered to a disordered open structure.
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