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Cubic structure of chromium-bromine boracite at 298 and 113 K

Published inActa crystallographica. Section B, Structural science, vol. 48, no. 1, p. 30-32
Publication date1992
Abstract

Cr3B7Ol3Br, Mr = 519.55, cubic, F43c, Z = 8, a(Mo Ka) = 0.71073 ,~, F(000) = 1968. At 298 K: a = 12.1524 (1)/~, V = 1794.68 (3) A3, Dx = 3.845 Mg m-3, /mu = 8.533 mm-1, final R = 0.020 for 206 unique reflections with I > 3/sigma(I); shortest interatomic distances (A): Cr--O = 2.061 (2), Cr--Br = 3.03810 (3), B--O = 1.436 (3), O--O = 2.388 (2). At 113K: a=12.1340 (3) A, V=1786.54 (13) A3, Dx, =3.863Mg m-3, /mu=8.533mm-1, final R=0.025 for 281 unique reflections with I> 3/sigma(I); shortest interatomic distances (A): Cr--O = 2.057 (2), Cr--Br = 3.0335 (1), B--O = 1.436 (3), O--O = 2.390 (2). The planarity of the metal-centred CrO4 groups does not differ significantly from that in other chromiumbased cubic boracites and generally increases as the temperature is lowered.

Citation (ISO format)
YOSHIDA, Masato et al. Cubic structure of chromium-bromine boracite at 298 and 113 K. In: Acta crystallographica. Section B, Structural science, 1992, vol. 48, n° 1, p. 30–32. doi: 10.1107/S0108768191011965
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