Other
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.1267c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 57, Issue 6, pp.1267-1275
Other
4
Scientific paper
The heat capacities of six melts of the system MgO-Al 2 O 3 -SiO 2 have been determined from drop calorimetry measurements made between 900 and 1800 K. These and previously published data show that within the glass-forming region of this system the heat capacity is a linear function of composition. The partial molar heat capacities of SiO 2 and MgO are temperature independent and equal to the values obtained previously for Al-free melts, whereas that of Al 2 O 3 increases with temperature and is consistent with the heat capacity of pure alumina liquid. Although melts of the system MgO-Al 2 O 3 -SiO 2 behave as ideal solutions with respect to the heat capacity, available measurements for other liquids show that this conclusion is not generally valid for aluminosilicates. Some thermochemical and structural implications of this behavior are also discussed.
Courtial Philippe
Richet Pascal
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