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Boron Phosphate: Preparation in Aqueous Medium; Physical and Chemical Characterization
Author(s) -
Ashboren Araten David
Publication year - 1974
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.197400072
Subject(s) - calcination , chemistry , boric acid , boron , aqueous solution , phosphate , phosphoric acid , inorganic chemistry , evaporation , nuclear chemistry , organic chemistry , catalysis , thermodynamics , physics
Heating equimolar amounts of pure phosphoric and boric acids in aqueous solution yields, at 130°, a solid boron phosphate of the composition R = P 2 O 5 /B 2 O 3 = 1:1.71. Increasing the calcination temperature to 575° increases R to 1:1.29 due to evaporation of boron‐values. Further heating to 850° causes no additional weight losses. The specific surface decreases monotonically with the calcination temperature, from 7.4 to 0.5 m 2 /g. X‐ray diffraction data indicate that up to 10 min heating at 800°, increased calcination temperature causes a monotonic decrease in the unit cell dimensions, while prolonged heating (48 h) at this temperature reverses this trend.