Abstract
The influence of reducing sintering conditions on anisotropic grain growth in BaTiO3 was studied above the BaTiO3‐Ba6Ti17O40 eutectic temperature. The morphology and structure of exaggeratedly grown grains was examined by X‐ray powder diffractometry, scanning electron micros‐copy, and high‐resolution transmission electron microscopy. The results show that all anomalously grown anisotropic grains were hexagonal BaTiO3 in the form of platelike crystals with a/c ratios up to 10. The direction of preferential growth of hexagonal grains is crystallographically analogous with that of parallel (111) twins in a cubic phase. Ti3+ ions, induced by reducing atmosphere, play an important role in the formation of hexagonal stacking.
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