Glass transitions and thermodynamic properties of amorphous SiO2, NaAlSinO2n+2 and KAlSi3O8 |
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| Authors: | Pascal Richet Yan Bottinga |
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| Institution: | Laboratoire de Géochimie et Cosmochimie, Institut de Physique du Globe, et Départment des Sciences de la Terre, Universités Paris VI et VII, 75251 Paris Cedex 05, France;Université de Nice, Parc Valrose, 06034 Nice, France |
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| Abstract: | A drop calorimetric study, between 900 and 1800 K, of amorphous SiO2, NaAlSi3O8, NaAlSi2O6, NaAlSiO4 and KAlSi3O8 shows the increase in heat capacity which results from glass transitions. For these glasses, the fictive temperature has a negligible effect on the heat capacity above room temperature, but it has an important influence on the enthalpy of formation as obtained from solution calorimetry. From these results and published Cp and enthalpy of solution data, several properties have been calculated: the enthalpies of fusion of high albite, nepheline, Jadeite and high sanidine, the thermodynamic functions of amorphous NaAlSi3O8 and KAlSi3O8 between 0 and 2000 K, and some mixing properties of liquids along the join SiO2-NaAlSi3O8. The latter data suggest that these liquids behave more closely as athermal solutions than as regular solutions. |
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