Abstract
AbstractThe effect of CaF2 on the viscosities of the MO‐SiO2‐xMnO‐yCaF2 melts (M[=Ca or Ba]O/SiO2 = 0.4‐0.5, x = 10[±1] or 40[±2] mol%, y = 0‐15 mol%) have been studied at high temperatures. At MnO = 40[±2] mol%, the viscosity of Ba‐Mn‐silicate melts is lower than that of Ca‐Mn‐silicate melts because Mn2+ is a strong network modifier in the former system. However, the viscosities of both alkaline earth silicate melts with MnO = 10[±1] mol% are not affected by cation type because MnO activity is too low to affect the viscosity of the melts. The CaF2 addition decreases the viscosities of the Ba‐Mn‐silicate melts with low‐MnO contents, while it has less impact on the viscosities of the melts with high‐MnO contents. The effect of CaF2 on the relationship between viscosity and the structure of the silicate melts is quantitatively analyzed using the micro‐Raman spectra of quenched glass samples. The NBO/Si ratio of alkaline earth silicate melts, which indicates the degree of polymerization of the silicate networks, has a linear relationship with the activation energy for the viscous flow of the melts.
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