Barium phosphate
Chemical compound
From Wikipedia, the free encyclopedia
Barium phosphate, also known as barium orthophosphate, is an inorganic phosphate of barium with the molecular formula Ba3(PO4)2. It is usually found as a white, odorless powder which is insoluble in water.[1]
| Names | |
|---|---|
| IUPAC name
Barium phosphate | |
| Other names
Barium orthophosphate | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.033.491 |
| EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| Ba3(PO4)2 | |
| Molar mass | 601.9 g/mol |
| Appearance | Powder |
| Structure | |
| Rhombohedral | |
| R3m | |
| Hazards | |
| GHS labelling: | |
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| Warning | |
| H302, H332 | |
| P261, P264, P270, P271, P301+P317, P304+P340, P317, P330, P501 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Synthesis
The general chemical reaction for the synthesis of barium phosphate powder, using the sol-gel process, is:[2]
3 Ba(NO3)2 + 2 NH4H2PO4 → Ba3(PO4)2 + 2 NH4NO3 + 4 HNO3
Barium phosphate is formed as a precipitate.
Structure
Its crystal structure is rhombohedral with a space group of R3m, identical to that of strontium phosphate.[3]
Properties
Barium phosphate exhibits properties such as high refractive index, low melting point, low glass transition temperature, high transparency to ultraviolet light, and high thermal expansion coefficient.[4]