Strontium phosphate

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Strontium phosphate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.028.369 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 231-206-0
PubChem CID
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 mass 452.8 g/mol
AppearanceWhite solid
Density 4.53 g/cm3
Melting point 1,620 °C (2,950 °F; 1,890 K) [1]
Insoluble [2] [3]
Structure [4]
Rhombohedral
R3m
a = 5.39 Å, c = 19.78 Å
497.8 Å3
Related compounds
Other anions
Strontium sulfate
Other cations
Tricalcium phosphate
Barium phosphate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

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

Preparation and properties

Strontium phosphate is commonly produced by the reaction of soluble strontium compounds, such as strontium nitrate, and a phosphate source, such as phosphoric acid or tripotassium 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 to strontium 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 of ammonium dihydrogen phosphate and strontium carbonate at 1030 °C and 30 MPa of pressure. [4] [8]

References

  1. ↑ 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.
  2. ↑ Haynes, W. M., ed. (2014). CRC Handbook of Chemistry and Physics (95th ed.). Boca Raton, Florida: CRC Press. p. 4-92. ISBN   9781482208672.
  3. ↑ 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.
  4. 1 2 Sugiyama, Kazumasa; Tokonami, Masayasu (1990). "The crystal structure refinements of the strontium and barium orthophosphates". Mineralogical Journal. 15 (4): 141–146. doi: 10.2465/minerj.15.141 . ISSN   0544-2540.
  5. ↑ "Strontium phosphate". PubChem. Retrieved 4 July 2025.
  6. 1 2 Collin, Robert L. (1966). "Precipitate Formation in the Strontium-Phosphate System". Science. 151 (3716): 1386–1388. doi:10.1126/science.151.3716.1386. ISSN   0036-8075.
  7. 1 2 Collin, 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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