S. AQDIM, M. OUCHETTO
338
the Fe2O3 content. The improved chemical resistance of
iron phosphate glasses was attributed to the replacement
of the easily hydrated P-O-P and Li-O-P bonds by corro-
sion-resistant Fe-O-P bonds. As the Fe2O3 content in the
glass increased, the number of Fe-O-P bands also in-
creased. The IR spectra indicates that iron phosphate
glasses are dominated by , 3
3 dimer units
and contain a large number of Fe-O-P bonds. The struc-
tural change caused an important tendency for crystalli-
zation which is the origin of the high chemical durability.
4
27
PO
3
PO
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