Barium phosphate
{{Short description|Chemical compound}}
{{distinguish|Barium metaphosphate}}
{{Chembox
| ImageFile =
| ImageSize =
| IUPACName = Barium phosphate
|Section1={{Chembox Identifiers
| CASNo = 13517-08-3
| ChemSpiderID = 145305
| EC_number = 236-856-9
| PubChem = 165803
| StdInChI=1S/3Ba.2H3O4P/c;;;2*1-5(2,3)4/h;;;2*(H3,1,2,3,4)/q3*+2;;/p-6
| StdInChIKey = WAKZZMMCDILMEF-UHFFFAOYSA-H
| SMILES = [O-]P(=O)([O-])[O-].[O-]P(=O)([O-])[O-].[Ba+2].[Ba+2].[Ba+2]
}}
|Section2={{Chembox Properties
| Formula = Ba3(PO4)2
| MolarMass = 601.9 g/mol
| Appearance = Powder
}}
| Section3 = {{Chembox Structure
| CrystalStruct = Rhombohedral
}}
|Section7={{Chembox Hazards
| GHS_ref=[https://pubchem.ncbi.nlm.nih.gov/compound/165803#section=Safety-and-Hazards]
| GHSPictograms = {{GHS07}}
| GHSSignalWord = Warning
| HPhrases = {{H-phrases|302|332}}
| PPhrases = {{P-phrases|261|264|270|271|301+317|304+340|317|330|501}}
}}
}}
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.{{cite web |title=Barium Phosphate: Versatile Uses and Key Benefits |url=https://eureka.patsnap.com/blog/what-is-barium-phosphate/ |website=Eureka |access-date=11 March 2025}}{{unreliable source|date=March 2025}}
Preparation
The general chemical reaction for the synthesis of barium phosphate powder is:{{cite web |title=Ba3(PO4)2 Photocatalyst for Efficient Photocatalytic Application |url=https://digital.csic.es/bitstream/10261/364646/1/Global%20Challenges%20-%202023%20-%20Naciri%20-%20Ba3%20PO4%202%20Photocatalyst%20for%20Efficient%20Photocatalytic%20Application.pdf |access-date=23 April 2025 |page=9}}
3 Ba(NO3)2 + 2 NH4H2PO4 → Ba3(PO4)2 + 2 NH4NO3 + 4 HNO3
Structure
Its crystal structure is rhombohedral with a space group of R{{overbar|3}}m, the same as in strontium phosphate.{{cite journal |last1=Zachariasen |first1=W. H. |title=The crystal structure of the normal orthophosphates of barium and strontium |journal=Acta Crystallographica |date=2 November 1948 |volume=1 |issue=5 |pages=263–265 |doi=10.1107/S0365110X48000697}}
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.{{cite web |title=Barium Phosphate Powder |url=https://www.sigmaaldrich.com/IN/en/product/aldrich/773956?srsltid=AfmBOoom74En5JwSXKgrXEui9Vyto15BeZJX7Or9FKWeAzBybjOkYcHH |website=Sigma Aldrich |access-date=12 March 2025}}
Applications
See also
References
{{reflist}}
{{Barium compounds}}
{{Phosphates}}