Barium phosphate

Barium phosphate
Names
	IUPAC name Barium phosphate
Identifiers
CAS Number	13517-08-3 ;
3D model (JSmol)	Interactive image ;
ChemSpider	145305 ;
ECHA InfoCard	100.033.491
EC Number	236-856-9;
PubChem CID	165803 ;
CompTox Dashboard (EPA)	DTXSID20889612 ;
	InChI InChI=1S/3Ba.2H3O4P/c;;;21-5(2,3)4/h;;;2(H3,1,2,3,4)/q3*+2;;/p-6 Key: WAKZZMMCDILMEF-UHFFFAOYSA-H;
	SMILES [O-]P(=O)([O-])[O-].[O-]P(=O)([O-])[O-].[Ba+2].[Ba+2].[Ba+2];
Properties
Chemical formula	Ba3(PO4)2
Molar mass	601.9 g/mol
Appearance	Powder
Structure
Crystal structure	Rhombohedral
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H332
Precautionary statements	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). Infobox references

Last updated May 27, 2025

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]

Preparation

The general chemical reaction for the synthesis of barium phosphate powder is:^[2]

3 Ba(NO₃)₂ + 2 NH₄H₂PO₄ → Ba₃(PO₄)₂ + 2 NH₄NO₃ + 4 HNO₃

Structure

Its crystal structure is rhombohedral with a space group of R3m, the same as in 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]

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.^[4]

References

↑ "Barium Phosphate: Versatile Uses and Key Benefits". Eureka. Retrieved 11 March 2025.^{[ unreliable source? ]}
↑ "Ba3(PO4)2 Photocatalyst for Efficient Photocatalytic Application" (PDF). p. 9. Retrieved 23 April 2025.
↑ Zachariasen, W. H. (2 November 1948). "The crystal structure of the normal orthophosphates of barium and strontium". Acta Crystallographica. 1 (5): 263–265. doi:10.1107/S0365110X48000697.
1 2 "Barium Phosphate Powder". Sigma Aldrich. Retrieved 12 March 2025.

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[eureka-1] "Barium Phosphate: Versatile Uses and Key Benefits". Eureka. Retrieved 11 March 2025.^{[ unreliable source? ]}

[PDF-2] "Ba3(PO4)2 Photocatalyst for Efficient Photocatalytic Application" (PDF). p. 9. Retrieved 23 April 2025.

[3] Zachariasen, W. H. (2 November 1948). "The crystal structure of the normal orthophosphates of barium and strontium". Acta Crystallographica. 1 (5): 263–265. doi:10.1107/S0365110X48000697.

[sigma-4] 1 2 "Barium Phosphate Powder". Sigma Aldrich. Retrieved 12 March 2025.

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