Acta Cryst. (2009). B65, 445-449 [ doi:10.1107/S0108768109024161 ]
Abstract: Several interesting fluoroberyllium borates were synthesized hydrothermally and characterized by single-crystal X-ray diffraction. The crystal structures of RbBe2BO3F2 (RBBF; rubidium fluoroberyllium borate) and CsBe2BO3F2 (CBBF; caesium fluoroberyllium borate), previously determined in the space group C2, were reinvestigated for higher symmetry and found to have more suitable solutions in the space group R32. TlBe2BO3F2 (TBBF; thallium fluoroberyllium borate) was synthesized as a novel compound also having this trigonal structure type. Details of the space-group determination and unique structural features are discussed. These crystal structures were compared with that of KBe2BO3F2, revealing interesting structural trends within this family of compounds that are also discussed. A crystallographic explanation of the physical morphology is postulated.
Keywords: hydrothermal synthesis; space-group determination; physical morphology; optical materials.
 |   Structure factor file (CIF format) (9.1 kbytes) |
| Structure factor file (CIF format) (10.9 kbytes) |
| Structure factor file (CIF format) (9.0 kbytes) |
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