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Single crystals of BaTiO3 were grown from the TiO2-rich side of the BaO-TiO2 system. They were chunky crystal with mainly {111} form. However, these chunky crystals are obtained only under a reduced atmospheric pressure. An oxygen defect seems to have an effect on the crystal morphology. Curie point of the present crystals is about 128°C and is a little higher than that of the BaTiO3 butterfly crystals. Crystallographic data for the present crystals are a=3.993 Å and c=4.037 Å at room temperature (tetragonal perovskite-type structure).
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Hiromu Sasaki (1965) studied this question.
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