Abstract
The viscosity of sodium borate melts is measured in the temperature range 918–1655 K using a vibrating viscometer operating in the forced oscillation mode. The content of sodium oxide varies from 0 to 37.7 mol %. Using the configuration–activation model, the parameters of the activation energy of the viscous flow of liquid and vitrifying melts are calculated. It is found that with an increase in the content of sodium oxide, deviations from the additivity rule are observed in the values of the melt viscosity, including three well-defined viscosity maximums at 7, 15.5, and 28 mol % Na2O. Such a change in properties indicates a strong interparticle chemical interaction between the components of the melt. An explanation is given for the observed dependences in terms of structural changes in the melt.
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This study was carried out as part of a state task of the Institute of Metallurgy, Ural Branch, Russian Academy of Sciences using the equipment of the Central Collective Use Center “Ural-M.”
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Melchakov, S.Y., Khokhryakov, A.A., Samoilova, M.A. et al. Viscosity and Free Energy of the Activation of a Viscous Flow of Sodium Borrate Melts. Glass Phys Chem 48, 174–179 (2022). https://doi.org/10.1134/S1087659622030063
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DOI: https://doi.org/10.1134/S1087659622030063