3D model (JSmol)
|Molar mass||105.78 g/mol|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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.
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.
The main reaction of the process is:
- H3BO3 + H3PO4 → BPO4 + 3 H2O
Due to the particular industrial interest of boron phosphate, other methods are used as well:
- Phosphoric acid and triethyl borate
- Triethyl phosphate and boron trichloride
- Diammonium phosphate acid and borax heated to 1000 °C
- Boric acid and phosphorus pentoxide (hydrothermal)
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. The structure of AlPO4, berlinite, is isomorphous with α-quartz.
- Corbridge DEC 2013, Phosphorus: Chemistry, Biochemistry and Technology, 6th ed., CRC Press, Boca Raton, Florida, ISBN 978-1-4398-4088-7
- Mylius, F.; Meusser, A. (1904). "Ueber die Bestimmung der Borsäure als Phosphat". Berichte der deutschen chemischen Gesellschaft. 37: 397. doi:10.1002/cber.19040370171.
- 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.
- 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.
- 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.
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