Monocalcium phosphate monohydrate Ca(H2PO4)2·H2O |
Triclinic |
2.23 |
In solution: as liquid phase in certain cements |
Anhydrous monocalcium phosphate Ca(H2PO4)2
|
Triclinic |
2.57 |
In solution: as liquid phase in certain cements |
Dicalcium phosphate dihydrate CaHPO4·2H2O |
Monoclinic |
2.30 |
Thin deposits, cements and composites |
Dicalcium phosphate anhydrous CaHPO4
|
Triclinic |
2.93 |
Thin deposits, cements and composites |
Amorphous Tricalcium phosphate Ca3(PO4)2·nH2O |
Three polymorphs based on temperature |
– |
Thin deposits, cements and composites |
Octocalcium phosphate Ca8(PO4)4(HPO4)2·5H2O |
Triclinic |
2.67 |
Cements |
Tricalcium phosphate β Ca3(PO4)2
|
Rhombohedral |
3.07 |
Resorbable bioceramics, cements, composites |
Tricalcium phosphate α Ca3(PO4)2
|
Monoclinic |
2.86 |
Resorbable bioceramics, cements, composites |
Tetracalcium phosphate Ca4(PO4)2O |
Monoclinic |
3.05 |
Cements |
Hydroxyapatite phospho-calcium Ca10(PO4)6(OH)2
|
Hexagonal (the stoichiometric HAp is monoclinic at temperatures <212 °C, whereas in other cases, the small quantities of impurities lead to a change from monoclinic to hexagonal) |
3.16 |
Cements, composites, ceramics and thin films |