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Ba 2 Ti 9 O 20 crystallizes in the monoclinic system with α= l.4818(5) nm, b = 1.4283(6), and c = 0.7109(2) with β = 98.37°±0.07°. The most likely space group is P 2 1 / m , Z = 4 with a calculated density 4.58 g/cm 3 . The powder pattern was indexed. The Ba 2 Ti 9 O 20 crystals form as stellated groups when melts of BaCl 2 + 20 to 50% TiO 2 cool from 1275°C.
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O’Bryan et al. (1980) studied this question.
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