Boron phosphate

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Boron phosphate
IUPAC name
Boron phosphate
3D model (JSmol)
ECHA InfoCard 100.033.020
Molar mass 105.78 g/mol
Density 2.52 g/cm3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Boron phosphate is an inorganic compound with the chemical formula BPO4. The simplest way of producing it is the reaction of phosphoric acid and boric acid. It is a white infusible solid that evaporates above 1450 °C.[1]


Boron phosphate is synthesized from phosphoric acid and boric acid at a temperature range from 80 °C to 1200 °C. The relatively cold treatment produces a white amorphous powder, which is converted to a microcrystalline product when heated at about 1000 °C for 2 hours.[2]

The main reaction of the process is:

H3BO3 + H3PO4 → BPO4 + 3 H2O

New ways of synthesizing the compound have also been reported, such as hydrothermal and microwave synthesis.[3]

Due to the particular industrial interest of boron phosphate, other methods are used as well:[3]


If obtained at pressure, the ordinary structure is isomorphous with the β-cristobalite, while subjecting it to high pressure is obtained a compound isomorphic with α-quartz.[4] The structure of AlPO4, berlinite, is isomorphous with α-quartz.[1]


It is used as a catalyst for dehydration and other reactions in organic synthesis. Also, it serves as a source of phosphates in the exchange reaction in the solid state to obtain metal phosphates.[5]


  1. ^ a b Corbridge DEC 2013, Phosphorus: Chemistry, Biochemistry and Technology, 6th ed., CRC Press, Boca Raton, Florida, ISBN 978-1-4398-4088-7
  2. ^ Mylius, F.; Meusser, A. (1904). "Ueber die Bestimmung der Borsäure als Phosphat". Berichte der deutschen chemischen Gesellschaft. 37: 397. doi:10.1002/cber.19040370171.
  3. ^ a b Baykal, A; Kizilyalli, M; Toprak, Muhammet S. & Kniep, R (2001). "Hydrothermal and microwave synthesis of boron phosphate, BPO4". Turkish Journal of Chemistry. 25 (4): 425–432.
  4. ^ MacKenzie, J. D.; Roth, W. L.; Wentorf, R. H. (1959). "New high pressure modifications of BPO4 and BAsO4". Acta Crystallographica. 12: 79. doi:10.1107/S0365110X5900024X.
  5. ^ Moffat, J. B.; Goltz, H. L. (1965). "Surface Chemistry and Catalytic Properties of Boron Phosphate: 1. Surface Area and Acidity". Canadian Journal of Chemistry. 43 (6): 1680. doi:10.1139/v65-222.