Tricalcium phosphate
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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.[4][5]
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Calcium phosphate | |
Other names
Tribasic calcium phosphate, tricalcium bis(phosphate) | |
Identifiers | |
3D model (JSmol) |
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ChEBI | |
ChemSpider |
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ECHA InfoCard | 100.028.946 |
EC Number |
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PubChem CID |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
Ca3(PO4)2 | |
Molar mass | 310.18 g/mol |
Appearance | White amorphous powder |
Density | 3.14 g/cm3[1] |
Melting point | 1,670 °C (3,040 °F; 1,940 K)[1] |
1.2 mg/kg[1] | |
Solubility product (Ksp) |
2.07×10−33[2] |
Thermochemistry | |
Std enthalpy of formation (ΔfH⦵298) |
−4126 kJ/mol (α-form)[3] |
Pharmacology | |
A12AA01 (WHO) | |
Hazards | |
NFPA 704 (fire diamond) | |
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).
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It exists as three crystalline polymorphs α, α′, and β. The α and α′ states are stable at high temperatures.