Physics
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48..453r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 48, Issue 3, pp.453-470
Physics
29
Scientific paper
A drop calorimetric study, between 900 and 1800 K, of amorphous SiO 2 , NaAlSi 3 O 8 , NaAlSi 2 O 6 , NaAlSiO 4 and KAlSi 3 O 8 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 NaAlSi 3 O 8 and KAlSi 3 O 8 between 0 and 2000 K, and some mixing properties of liquids along the join SiO 2 -NaAlSi 3 O 8 . The latter data suggest that these liquids behave more closely as athermal solutions than as regular solutions.
Bottinga Yan
Richet Pascal
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