Acta Crystallographica Section C

Crystal Structure Communications

Volume 59, Part 2 (February 2003)

Acta Cryst. (2003). C59, i11-i14    [doi:10.1107/S0108270102023053]

Barium-deficient celsian, Ba_1-xAl_2-2xSi_2+2xO₈ (x = 0.20 or 0.06)

M. G. Skellern, R. A. Howie, E. E. Lachowski and J. M. S. Skakle

Abstract: Barium-deficient forms of celsian (barium aluminium silicate) with the formula Ba_1-xAl_2-2xSi_2+2xO₈ (x = 0.20 and 0.06) have been identified. In contrast with the celsian-orthoclase solid solutions which have been reported previously, these forms, refined in the space group C2/m, with Ba and one O atom in the 4i sites with m site symmetry, and a further O atom in a 4g site with twofold axial symmetry, suggest a slight solid solution with silica. The serendipitous preparation of the compounds represents a possible hazard associated with solid-state synthesis.

Formula: Ba_0.80Al_1.60Si_2.40O₈ and Ba_0.94Al_1.88Si_2.12O₈

Online 18 January 2003

	Structure factor file (CIF format) (67.5 kbytes) Contains datablock I
	Structure factor file (CIF format) (55.1 kbytes) Contains datablock II

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