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Free keywords:
boron; BPO4; crystal growth; crystal structure
Abstract:
Single crystals of BPO4 were grown by chemical transport reactions with
PCl5 using a gradient from 1073 K to 973 K as well as with solvothermal
syntheses in the temperature range between 413 K and 523 K using water,
ethanol or 2-propanol as polar protic solvents. The atomic arrangement
of BPO4 was reinvestigated by means of single crystal X-ray diffraction
data and confirmed the earlier findings with significantly smaller
standard deviations. Thermogravimetric investigations of powdered
samples which show no extra lines in X-ray diffraction diagrams
revealed weight decrements which are attributed to water losses. The
presence of protonated borate and phosphate species in a number of
X-ray pure solvothermally grown BPO4 samples is evidenced by infrared
spectroscopy.
