Abstract
The abnormal grain growth (AGG) behaviour was reported during the solid-state sintering of a nano-sized BaTiO3 powder using the spark plasma sintering technique. Microstructural observations revealed that coarse crystals containing large amounts of faceted pores burst into formation within minutes. The results challenged the traditional views that sintering was predominated by the atom-diffusion related processes. Instead, the phenomena were explained to be resulted from the oriented attachment of smaller BaTiO3 grains. A modified two-sphere model for nanoceramic sintering was also proposed.
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