Tetracalcium phosphate

Tetracalcium phosphate
Names
	IUPAC name Tetracalcium oxide diphosphate
	Other names Tetracalcium diphosphorus nonaoxide, tetracalcium oxygen(2-) diphosphate, calcium oxide phosphate, TTCP, TetCP, Thomas phosphate
Identifiers
CAS Number	1306-01-0 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.013.767
EC Number	215-143-6;
PubChem CID	164806;
UNII	CJ64N85J4S ;
CompTox Dashboard (EPA)	DTXSID50926827 ;
	InChI InChI=1S/4Ca.2H3O4P.O/c;;;;21-5(2,3)4;/h;;;;2(H3,1,2,3,4);/q4*+2;;;-2/p-6 Key: GBNXLQPMFAUCOI-UHFFFAOYSA-H;
	SMILES [O-2].[O-]P(=O)([O-])[O-].[O-]P(=O)([O-])[O-].[Ca+2].[Ca+2].[Ca+2].[Ca+2];
Properties
Chemical formula	Ca4(PO4)2O
Molar mass	366.254124 g/mol
Appearance	white
Melting point	decomp
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Tetracalcium phosphate is the compound Ca₄(PO₄)₂O, (4CaO·P₂O₅). It is the most basic of the calcium phosphates, and has a Ca/P ratio of 2, making it the most phosphorus poor phosphate.^[1] It is found as the mineral hilgenstockite, which is formed in industrial phosphate rich slag (called "Thomas slag"). This slag was used as a fertiliser due to the higher solubility of tetracalcium phosphate relative to apatite minerals.^[2] Tetracalcium phosphate is a component in some calcium phosphate cements that have medical applications.^[1]

^ ^a ^b Moseke, C.; Gbureck, U. (October 2010). "Tetracalcium phosphate: Synthesis, properties and biomedical applications". Acta Biomaterialia. 6 (10): 3815–3823. doi:10.1016/j.actbio.2010.04.020. PMID 20438869. – via ScienceDirect (Subscription may be required or content may be available in libraries.)
^ Walter E. Brown; Earl F. Epstein (November–December 1965). "Crystallography of Tetracalcium Phosphate". Journal of Research of the National Bureau of Standards Section A. 69A (6): 547–551. doi:10.6028/jres.069a.059. PMC 6599098. PMID 31927823.

[Moseke2010-1] Moseke, C.; Gbureck, U. (October 2010). "Tetracalcium phosphate: Synthesis, properties and biomedical applications". Acta Biomaterialia. 6 (10): 3815–3823. doi:10.1016/j.actbio.2010.04.020. PMID 20438869. – via ScienceDirect (Subscription may be required or content may be available in libraries.)

[BrownEpstein-2] Walter E. Brown; Earl F. Epstein (November–December 1965). "Crystallography of Tetracalcium Phosphate". Journal of Research of the National Bureau of Standards Section A. 69A (6): 547–551. doi:10.6028/jres.069a.059. PMC 6599098. PMID 31927823.

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