Synthesis, crystal structure, infrared spectrum and thermal behaviourof α-BaHPO4

The phosphate α-BaHPO4 was synthesised as a single-phase crystalline powder starting from an aqueous solution of barium hydroxide and phosphorus pentoxide at 373 K. α-BaHPO4 crystallises in a new structure type in which the Ba2+ ions form a distorted body-centred arrangement with the HPO4− anions in the quasi-octahedral voids (BaHPO4, Aem2, Z = 16, a = 459.96(9), b = 22.809(5), c = 14.081(3) pm, wR2 = 0.077, R1 = 0.069, 1995 reflections, 102 parameters). The crystal structures of α-BaHPO4 and β-BaHPO4 are compared. The infrared spectrum and a thermal and thermogravimetric analysis of α-BaHPO4 are also reported.

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