Phosphorus speciation in sodium–calcium–phosphate ceramics
Abstract
A series of ceramics derived from glasses of general formula
(P
2
O
5
)
0.45
(CaO)
0.2+x
(Na
2
O)
0.35-x
(x = 0.0–0.12) were prepared and one- and
two-dimensional
31
P magic-angle spinning NMR spectroscopy
confirmed the predominant speciation of Q
1
phosphorus as
Na
4
-, Na
2
Ca-, and α- and
β-Ca
2
-P
2
O
7
, but did not show any
Q
1
–Q
2
connectivity characteristic of short
metaphosphate chains.
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