Barium metaphosphate

Not to be confused with barium phosphate.

Barium metaphosphate

Names
IUPAC name

barium(2+); dioxido(oxo)phosphanium

Identifiers

CAS Number

* 13762-83-9 N

3D model (JSmol)

* Interactive image

ChemSpider |

* 2341276

EC Number |

* 237-362-6

PubChem CID

* 3084168

InChI

* InChI=1S/Ba.2HO3P/c;2*1-4(2)3/h;2*(H,1,2,3)/q+2;;/p-2

Key: XNJIKBGDNBEQME-UHFFFAOYSA-L

SMILES

* [O-][P+](=O)[O-].[O-][P+](=O)[O-].[Ba+2]

Properties

Chemical formula

| Ba(PO3)2
Molar mass | 295.27 g/mol
Appearance  | Powder[1]
Density | 3.63 g/cm3
Melting point |  1,560[2] °C (2,840 °F; 1,830 K)

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Infobox references

Tracking categories (test):

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Barium metaphosphate is an inorganic substance with the molecular formula Ba(PO3)2. It is a colourless solid that is insoluble in water, though is soluble in acidic solutions through "slow dissolution".[3] X-ray crystallography shows that this material is composed of Ba2+ cations attached to a polyphosphate ((PO3−)n) anion.[4] A number of hydrated forms are known which are actually cyclic metaphosphates, Ba2(P4O12)·3.5H2O, Ba3(P3O9)2·6H2O.[citation needed]

Structure of a subunit of linear polyphosphate anion.

## Preparation

Barium metaphosphate can be prepared by the reaction of barium carbonate with metaphosphoric acid:[citation needed]

BaCO3 \+ 2HPO3 → Ba(PO3)2 +CO2 +H2O

or alternatively by the aqueous reaction of barium chloride and sodium metaphosphate:[citation needed] BaCl2(aq) + 2NaPO3(aq) → Ba(PO3)2 \+ 2NaCl

## Applications

The combination of soda and barium polyphosphate forms a low-melting glass with a high coefficient of thermal expansion. The melting point of the glass increases with barium content. This glass makes seals with low melting metals like aluminium (melting point 650 °C). Normal borosilicate glasses soften above the melting point of aluminium. This mixture is prepared by heating a mixture of diammonium phosphate, sodium carbonate, and barium carbonate.[5]

## References

1. ↑ Elements, American. "Barium Metaphosphate". http://www.americanelements.com/barium-metaphosphate.html. Retrieved 17 April 2018.
2. ↑ "BARIUM METAPHOSPHATE - 13762-83-9". http://www.chemicalbook.com/ChemicalProductProperty_EN_CB2329833.htm. Retrieved 17 April 2018.
3. ↑ "Barium Metaphosphate". 2017. http://www.chemicalbook.com/ChemicalProductProperty_EN_CB2329833.htm.
4. ↑ "Form of barium metaphosphate" Grenier, Jean C.; Martin, Claude M.; Durif, Andre; Tran Qui Duc; Guitel, J. C. Bulletin de la Société Francaise de Minéralogie et de Cristallographie (1967), vol. 90, 24-31.
5. ↑ Wilder Jr., J.A. "Glasses and glass ceramics for sealing to aluminum alloys" Journal of Non-Crystalline Solids Volume 38-39, Issue PART 2, May 1980, Pages 879-884. Hart, Patricia E.; Mesko, Melissa G.; Shelby, James E. "Crystallization and phase equilibrium in the sodium barium metaphosphate system" Journal of Non-Crystalline Solids (2000), 263&264, 305-311. doi:10.1016/S0022-3093(99)00642-0

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Barium compounds

* Ba(BO2)2
* BaBr2
* Ba(CH3CO2)2
* Ba(C5H7O2)2
* Ba(ClO)2
* Ba(ClO2)2
* BaCO3
* BaC2O4
* Ba(ClO3)2
* Ba(ClO4)2
* Ba(CN)2
* BaCl2
* BaCrO4
* BaF2
* BaFeO4
* BaFe2O4
* BaI2
* Ba(IO3)2
* Ba(Mn2O8)
* Ba(N3)2
* Ba(NO3)2
* BaO
* BaO2
* Ba(OH)2
* BaS
* BaSO3
* BaSO4
* BaTiO3
* Ba2TiO4

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