Tricalcium phosphate

Tricalcium phosphate (sometimes abbreviated TCP), more commonly known as Calcium phosphate, is a calcium salt of phosphoric acid with the chemical formula Ca3(PO4)2. It is also known as tribasic calcium phosphate and bone phosphate of lime (BPL). It is a white solid of low solubility. Most commercial samples of "tricalcium phosphate" are in fact hydroxyapatite.

Tricalcium phosphate
Names
IUPAC name
Calcium phosphate
Other names
Tribasic calcium phosphate, tricalcium bis(phosphate)
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.028.946
EC Number
  • 231-840-8
UNII
  • InChI=1S/3Ca.2H3O4P/c;;;2*1-5(2,3)4/h;;;2*(H3,1,2,3,4)/q3*+2;;/p-6 Y
    Key: QORWJWZARLRLPR-UHFFFAOYSA-H Y
  • InChI=1S/3Ca.2H3O4P/c;;;2*1-5(2,3)4/h;;;2*(H3,1,2,3,4)/q3*+2;;/p-6
    Key: QORWJWZARLRLPR-CYFPFDDLAC
  • Key: QORWJWZARLRLPR-UHFFFAOYSA-H
  • [O-]P(=O)([O-])[O-].[O-]P(=O)([O-])[O-].[Ca+2].[Ca+2].[Ca+2]
Properties
Ca3(PO4)2
Molar mass 310.18 g/mol
Appearance White amorphous powder
Density 3.14 g/cm3
Melting point 1,670 °C (3,040 °F; 1,940 K)
1.2 mg/kg
2.07×10−33
Thermochemistry
−4126 kJ/mol (α-form)
Pharmacology
A12AA01 (WHO)
Hazards
NFPA 704 (fire diamond)
1
0
0
Flash point Non-flammable
Related compounds
Other anions
 Calcium pyrophosphate
Other cations
 Trimagnesium phosphate
Trisodium phosphate
Tripotassium phosphate
Related compounds
 Monocalcium phosphate
Dicalcium phosphate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is YN ?)
Infobox references

It exists as three crystalline polymorphs α, α′, and β. The α and α′ states are stable at high temperatures.

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