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Heat capacity of magnesium aluminosilicate melts

1993; Elsevier BV; Volume: 57; Issue: 6 Linguagem: Inglês

10.1016/0016-7037(93)90063-3

1872-9533

P. Courtial, Pascal Richet,

Recycling and utilization of industrial and municipal waste in materials production

The heat capacities of six melts of the system MgO-Al2O3-SiO2 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 SiO2 and MgO are temperature independent and equal to the values obtained previously for Al-free melts, whereas that of Al2O3 increases with temperature and is consistent with the heat capacity of pure alumina liquid. Although melts of the system MgO-Al2O3-SiO2 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.