Abstract
The thermodynamic equilibrium between sillimanite and andalusite has been determined from the measured phonon spectra. The corresponding aluminium silicate triple point is found to be in the range T=420° C-440° C and P=3.0–3.2 kbars. From the comparison of calorimetrically determined specific heat functions with those calculated from lattice vibrations additional effects of lattice faults of sillimanite are found to increase the temperature and pressure of the triple point considerably. The thermodynamic functions G(T), S(T) and H(T) are given for both structures.
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Salje, E., Werneke, C. The phase equilibrium between sillimanite and andalusite as determined from lattice vibrations. Contr. Mineral. and Petrol. 79, 56–67 (1982). https://doi.org/10.1007/BF00376961
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DOI: https://doi.org/10.1007/BF00376961