The
structure of borosilicate glasses of composition 30Na2O-2Al2O3-25SiO2-xFe2O3？(43-x) B2O3 has been investigated in the composition range of 0.5 20 mol% Fe2O3. 27Al, 11B, 29 Si MAS NMR and FTIR spectroscopies have been used
to measure the fraction of different structural species in the glasses. It is
evidenced from NMR data that both sodium and
Fe2O3 (in low region up to 7 mol%) are the main glass
modifier. Structural determination for borosilicate glasses with a high
content of (Fe2O3) was carried out by FTIR spectroscopy,
where both 11B and 29Si MAS NMR are impossible because of
the high quantities of paramagnetic iron (III) species present. NMR analysis
was performed on borosilicate glasses containing up to 7 mol% Fe2O3 and the N4 values obtained by FTIR spectroscopy agree within error
with the 11B NMR results of the same glass samples. Fe2O3 is a main glass modifier in the low-Fe2O3-content region
(≤6 mol%). On other hand, it plays the role of glass former at higher content
of Fe2O3. Increasing both N4 of boron
tetrahedral units and chemical shift of silicon nuclei to reach maxima at 5
mol% Fe2O3 confirms the role of Fe2O3 as a glass modifier in the low composition region. On the other hand, fast
decrease in N4 with further increasing Fe2O3 contents ≥6 mol%) is an evidence for iron oxide to inter the glass network as a
network former.
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