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]

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|Section2={{Chembox Properties

| Formula = Ba3(PO4)2

| MolarMass = 601.9 g/mol

| Appearance = Powder

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| Section3 = {{Chembox Structure

| CrystalStruct = Rhombohedral

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|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}}

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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.{{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

Barium phosphate finds uses in industrial applications, including optical applications like preparation of glasses with special properties for pulsed lasers, and preparation of solders for glass to glass bonding. It can also be used in development of hydrogen / fuel sensors.

See also

References

{{reflist}}

{{Barium compounds}}

{{Phosphates}}

Category:Inorganic compounds

Category:Phosphates

Category:Barium compounds