Biomedical Engineering Reference
In-Depth Information
Table 1.1
Existing calcium orthophosphates and their major properties [30, 31]
Ca/P molar
ratio
Compound
FOrmulA
Solubility at
25°C, −log(K
Solubility at
25°C, g/l
pH stability range in
aqueous solutions at 25°C
)
s
0.5 Monocalcium phosphate
monohydrate (mCPm)
Ca(H
PO
)
·H
O
1.14
~18
0.0-2.0
2
4
2
2
0.5 Monocalcium phosphate
anhydrous (mCPA or mCP)
Ca(H
PO
)
1.14
~17
[c]
2
4
2
1.0 Dicalcium phosphate dihydrate
(DCPD), mineral brushite
CaHPO
·2H
O
6.59
~0.088
2.0-6.0
4
2
1.0 Dicalcium phosphate anhydrous
(DCPA or DCP), mineral monetite
CaHPO
6.90
~0.048
[c]
4
1.33 Octacalcium phosphate (OCP) Ca
(HPO
)
(PO
)
·5H
O
96.6
~0.0081
5.5-7.0
8
4
2
4
4
2
1.5
α
-Tricalcium phosphate (
α
-TCP)
α
-Ca
(PO
)
25.5
~0.0025
[a]
3
4
2
1.5
β
-Tricalcium phosphate (
β
-TCP)
β
-Ca
(PO
)
28.9
~0.0005
[a]
3
4
2
1.2-2.2 Amorphous calcium phosphates
(ACP)
Ca
H
(PO
)
·
n
H
O,
n
[b]
[b]
~5-12
[d]
x
y
4
z
2
= 3-4.5; 15-20% H
O
2
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