Garnets, heat capacities

Table 5.24 Entropy and heat capacity function values for the various garnet end-members compared with calorimetric values.

Robie R. A., Zhao-Bin, Hemingway B. S. and Barton M. D. (1987). Heat capacity and thermodynamic properties of andradite garnets, Ca3Fc2Si30i2, between 10 and 1000 K and revised values for AG) (298.15 K) of hedembergite and wollastonite. Geochim. Cos-mochim. Acta, 51 2219-2236. 

Among the most interesting studies of thermal properties of rare-earth iron garnets are the heat capacity measurements at low temperature of Meyer and Harris (65, 139), Their data cover only the range 1.4°-20 °K. Below 5°K. the heat capacity of 4 trium iron garnet can be represented by the sum of the lattice term proportional to and by the spin-wave contribution of 2.15 X //(mole °K.). This last term is in... 

Thermodynamic data from solution calorimetry using molten lead borate [95, 101] for the perovskite and garnet phases have been combined with data for the YAM phase, and heat capacity data from adiabatic calorimetry and differential scanning calorimetry have been used to calculate the phase diagram for the binary system. This recent study shows unequivocally congruent melting of the perovskite phase and that it does not decompose to the YAM phase + liquid [95],... 

H. Yusa, M. Akaogi, and I. Eiji, Calorimetric study of MgSi03 garnet and pyroxene heat capacities, transition enthalpies, and equilibrium phase relations in MgSi03 at high pressures and temperatures, J. Geophys. Res. 1993, 98, 6453-6460. 

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