CaO-Al2O3 based glasses are studied due to their presence in hydraulic binders/refractory cements. With the addition of Fe, an increased complexity in the phase diagrams and the liquid structure is observed as this element can exist in two different oxidation states which plays different roles in a liquid/glass matrix. The aim of this study is to understand the influence iron addition in a CaO-Al2O3-B2O3 glass. B2O3 was added to simulate a liquid phase present in some Belite-Ye'elimite-Ferrite clinkers in which a glassy phase is observed. Iron is mainly present in the Fe3+ form in four-fold coordination. Viscosity and glass transition temperatures decrease with the addition of Fe2O3 which has an important impact for the clinkering process. This decrease with iron correlates with the appearance of a new band at 650 cm-1 in the Raman spectrum which can be assigned to the vibration of Al—O—[4]Fe3+—O—Al links.
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Hayek et al. (2026) studied this question.
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