A glass system was prepared from reagent grade chemicals having the formula 58 mol % B2O3 - 22 mol % CaO - (20 - χ) mol % Al2O3 - χ mol % Fe2O3, where χ has different values between 2 and 20 mol %.
The molar volume (Δ) and magnetic susceptibility (χ) of these glasses has been measured as a function of Fe2O3 content. The values of Δ and χ were found to increase as the Fe2O3 content in the glass increases in the region between 2 and 8 mol % and in the region where the content is greater than 10 to 16 mol %, while a decrease was found for samples having an Fe2O3 content of 10 mol % and more than 16 mol %. These results could be explained by the change in coordination of iron from FeO6 to FeO4, and also the change of Fe3+ to Fe2+ and change of Fe2+ from six coordination to four coordination.
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Kashif, I., Farouk, H., Salah, S.H. et al. Molar volume and magnetic susceptibility of borate glasses containing iron. J Mater Sci: Mater Electron 2, 220–222 (1991). https://doi.org/10.1007/BF00702925
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