Abstract
The heat capacity of Mg 3Al 2Si 3O 12 glass has been measured from 10 to 1000 K by adiabatic and differential scanning calorimetry. The heat capacity of crystalline pyrope has been determined from drop-calorimetry measurements between 820 and 1300 K. From these and previously published results a consistent set of thermodynamic data is presented for pyrope and Mg 3Al 2Si 3O 12 glass and liquid for the interval 0–2000 K. The enthalpy of fusion at 1570 ± 30 K, the metastable congruent 1-bar melting point, is 241 ± 12 kJ/mol .
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