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Strontium phosphate

From Wikipedia, the free encyclopedia
Chemical compound
Strontium phosphate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard100.028.369Edit this at Wikidata
EC Number
  • 231-206-0
UNII
  • InChI=1S/2H3O4P.3Sr/c2*1-5(2,3)4;;;/h2*(H3,1,2,3,4);;;/q;;3*+2/p-6
    Key: JOPDZQBPOWAEHC-UHFFFAOYSA-H
  • [O-]P(=O)([O-])[O-].[O-]P(=O)([O-])[O-].[Sr+2].[Sr+2].[Sr+2]
Properties
Sr3(PO4)2
Molar mass452.8 g/mol
AppearanceWhite solid
Density4.53 g/cm3
Melting point1,620 °C (2,950 °F; 1,890 K)[3]
Insoluble[1][2]
Structure[4]
Rhombohedral
R3m
a = 5.39 Å,c = 19.78 Å
497.8 Å3
Related compounds
Otheranions
Strontium sulfate
Othercations
Tricalcium phosphate
Barium phosphate
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa).
Chemical compound

Strontium phosphate is thephosphate salt ofstrontium, with the molecular formula Sr3(PO4)2. It is a white solid insoluble in water.[5]

Preparation and properties

[edit]

Strontium phosphate is commonly produced by the reaction of soluble strontium compounds, such asstrontium nitrate, and aphosphate source, such asphosphoric acid ortripotassium phosphate, in water, resulting in a white precipitate of the tetrahydrate:[6][7]

3 Sr(NO3)2 + 2 K3PO4 + 4 H2O → Sr3(PO4)2·4H2O↓ + 6 KNO3

Under water, the tetrahydrate slowly hydrolyses tostrontium hydroxyapatite (Sr10(PO4)6(OH)2). The tetrahydrate decomposes to the anhydrous form when heated to 900 °C.[6][7]

The anhydrous form can be produced without the presence of water, to avoid hydrolysis, by the heating ofammonium dihydrogen phosphate andstrontium carbonate at 1030 °C and 30 MPa of pressure.[4][8]

References

[edit]
  1. ^Haynes, W. M., ed. (2014).CRC Handbook of Chemistry and Physics (95th ed.).Boca Raton, Florida:CRC Press. p. 4-92.ISBN 9781482208672.
  2. ^Verbeeck, R. M. H.; Kiekens, P.; Driessens, F. C. M. (1981). "Phase Equilibria in Strontium Orthophosphate Solutions at 25° C".Zeitschrift für Physikalische Chemie.124 (1):45–53.doi:10.1524/zpch.1981.124.1.045.ISSN 2196-7156.
  3. ^Looney, James R.; Brown, Jesse J. (1971). "Phase Equilibria in the Sr3(PO4)2-Cd3(PO4)2 System and Eu2+-Activated Luminescence of Sr3(PO4)2 and Related Phases".Journal of the Electrochemical Society.118 (3): 470.doi:10.1149/1.2408084.
  4. ^abSugiyama, Kazumasa; Tokonami, Masayasu (1990)."The crystal structure refinements of the strontium and barium orthophosphates".Mineralogical Journal.15 (4):141–146.Bibcode:1990MinJ...15..141S.doi:10.2465/minerj.15.141.ISSN 0544-2540.
  5. ^"Strontium phosphate".PubChem. Retrieved4 July 2025.
  6. ^abCollin, Robert L. (1966). "Precipitate Formation in the Strontium-Phosphate System".Science.151 (3716):1386–1388.Bibcode:1966Sci...151.1386C.doi:10.1126/science.151.3716.1386.ISSN 0036-8075.PMID 5909785.
  7. ^abCollin, Robert L. (1964). "Preparation and Properties of Two Strontium Orthophosphates-Sr 3 (PO 4 ) 2 ˙4H 2 O and Sr 6 H 3 -(PO 4 ) 5 ˙2H 2 O.".Journal of Chemical & Engineering Data.9 (2):165–166.doi:10.1021/je60021a002.ISSN 0021-9568.
  8. ^Zhai, Shuangmeng; Liu, Ang; Xue, Weihong; Song, Yang (2011). "High-pressure Raman spectroscopic studies on orthophosphates Ba3(PO4)2 and Sr3(PO4)2".Solid State Communications.151 (4):276–279.doi:10.1016/j.ssc.2010.12.007.
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