Abstract
A powder mixture of α‐Si3N4, Y2O3, and SiO2 was heat‐treated in a loose powder state in the temperature range of 1750°–1900°C for 2 h; then, the mixture was acid‐rinsed to remove the glassy phase. The widths and lengths of the resulting β‐Si3N4 crystals were analyzed quantitatively. The width–aspect‐ratio distribution of the β‐Si3N4 crystals initially showed a strong negative correlation, and then the aspect ratio of crystals with small widths quickly decreased. After a stage in which aspect ratio was almost constant, regardless of the width, the width‐aspect‐ratio distribution evolved to show a positive correlation in the final stage. This pattern of morphology evolution of the β‐Si3N4 crystals was in good agreement with that predicted by the anisotropic Ostwald ripening model.
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