Biomedical Engineering Reference
In-Depth Information
19
F
LG35HT
LG35
LG34
LG33
0
-50
-100
-150
-200
ppm
Figure 12.6.
19
F MAS-NMR spectra of alumino-silicate glasses of the composition 2SiO
2
-Al
2
O
3
-
(2-x)CaO-xCaF
2
; LG33 (
X
= 0.25), LG34 (
X
= 0.5), LG35 (
X
= 1.0) and heat treated LG35 (LG35HT)
(spinning side bands are marked as •) [29].
1
0.5
0.8
0.4
Al (IV)
0.6
0.3
0.4
0.2
Al (V)
0.2
0.1
Al (VI)
0
0
0
0.5
1
1.5
2
2.5
3
3.5
Fluoride content (X)
Figure 12.7.
Relative proportion of Al(IV), Al(V) and Al(VI) as a function of fl uoride content
in the ionomer glasses [35].
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