Biomedical Engineering Reference
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orthophosphates [28, 114-116]. The most important parameters of
calcium orthophosphates are the ionic Ca/P ratio, basicity/acidity
and solubility. All these parameters strongly correlate with the
solution pH. The lower the Ca/P molar ratio is, the more acidic and
water-soluble the calcium orthophosphate is [27-29]. One can see
that the solubility ranges from high values for acidic compounds, such
as mCPm, to very low values for basic compounds, such as apatites,
which allow calcium orthophosphates to be dissolved, transported
from one place to another, and precipitated, when necessary.
Crystallization, dissolution, and phase transformation processes
of different calcium orthophosphates under various experimental
conditions have been reviewed recently [117].
Figure 1.3
Phase diagram of the system CaO-P
O
(C = CaO, P = P
O
) at
2
5
2
5
; other
abbreviations should be written out in the same manner.
Reprinted from Refs. [112, 113] with permission.
elevated temperatures. Here: C
P
means 7CaO·5P
O
7
5
2
5
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