Abstract
The effect of the CeO2 content and CeO2/Al2O3 ratio on the melt viscosity of CaO-SiO2(-Al2O3)-CeO2 was determined using the rotating cylinder method. The structural characteristics of the quenched vitreous samples were investigated with a Raman spectrometer. The results showed that the melt viscosity of CaO-SiO2(-Al2O3)-CeO2 decreased significantly with increases in the CeO2 content and the CeO2/Al2O3 ratio. Q3/Q2, which represents the degree of polymerization of the melt, decreased with an increase in the CeO2 content and the CeO2/Al2O3 ratio. Ce in the CaO-SiO2(-Al2O3)-CeO2 system was present as a mixture of Ce4+ and Ce3+ in high-purity Ar atmosphere at a temperature of 1540 °C. In the CaO-SiO2(-6%Al2O3)-6%CeO2 system, the melt viscosity was higher in the presence of Ce4+ and Ce3+ than in the presence of Ce3+, indicating that the melt viscosity of CaO-SiO2(-Al2O3)-CeO2 was determined by the combination of Ce4+ and Ce3+. CeO2 acted as a network modifier in the melt.
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