Diffusion Mechanisms of Aluminum Oxide during Solid State Sintering.
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概要
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General remarks of diffusion phenomena in solid state ceramics during sintering are reviewed. Referring to Schottky disorder and Frenkel disorder, formation energy of possible disorder mechanisms of aluminum oxide is discussed. Intrinsic diffusion is defined as a function of temperature, while extrinsic diffusion is affected by foreign oxide additives/impurities. The difference between fixed valence impurity of Mg and variable valence of Fe in aluminum oxide is the one of the key factors for elucidating activation energy of defects formation. In addition, isotropic grain growth law is introduced in order to comprehend the quantitative treatment of solid state sintering.
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