BORON PHOSPHATE: ITS SYNTHESIS, GRADUAL CRYSTALLISATION AND CHARACTERISATION OF BULK PROPERTIES

Primož Kmecl and Peter Bukovec

Faculty of Chemistry and Chemical Technology, University of Ljubljana, 1000 Ljubljana, Slovenia

Abstract

Boron phosphate, BPO₄, was synthesised from the equimolar mixture of H₃PO₄ and H₃BO₃ at temperatures from 25 to 1200 °C. IR spectra, X-ray diffraction pattern, thermal analysis and chemical analysis of boron and phosphorus show that the synthesis occurs already at the room temperature and that the crystallisation is a gradual process. The molar ratio of boron and phosphorous remains at 1:1 independently of the temperature of synthesis.