Low-temperature heat capacity of sodium borosilicate glasses at temperatures from 13 K to 300 K |
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| Affiliation: | 1. Deutsches GeoForschungsZentrum (GFZ), Section 3.3 Chemistry and Physics of Earth Materials, Telegrafenberg, D-14473 Potsdam, Germany;2. Mineralogisch-Petrographisches Institut, Universität Hamburg, Grindelallee 48, D-20146 Hamburg, Germany;1. Materials and Physics Research Centre, University of Salford, M5 4WT Salford, UK;2. Biomedical Research Centre, School of Environment and Life Sciences, University of Salford, Salford M5 4WT, UK;1. Nuclear Science and Engineering Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan |
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| Abstract: | Thermodynamic properties of sodium borosilicate glasses {56.7 SiO2, (43.7 − x)B2O3,xNa2O} wherex = 14.4, 22.9, and 32.5, have been studied. The heat capacity was measured using an adiabatic calorimeter at temperatures between 13 K and 300 K. The thermodynamic functions were calculated from the smoothed values ofCp, m . The results differ from an additive model with pure glassy SiO2, B2O3, and crystalline Na2O as components. A model based on the assumption that the contribution of structural units of glasses to the heat capacity is equal to those of glasses with the same molecular formula is proposed. |
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