Barium phosphate
From Wikipedia, the free encyclopedia
| 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: | |
 | |
| 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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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]
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]