Abstract
The low temperature heat capacities of three A IIInitrides, A III=Al, Ga and In, were measured by relaxation method in the temperature range 2–300 K and the corresponding entropies at the reference temperature 298.15 K were evaluated from the experimental data. The lattice heat capacity at constant volume was also assessed theoretically within harmonic crystal approximation by direct method using a combination of VASP software package to obtain the Hellmann-Feynman forces and the Phonon program to calculate the phonon spectra. The experimental data were analyzed by means of a Debye-Einstein model taking use of the calculated heat capacity and involving additionally an anharmonic contribution.
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Sedmidubský, D., Leitner, J., Svoboda, P. et al. Heat capacity and phonon spectra of A IIIN. J Therm Anal Calorim 95, 403–407 (2009). https://doi.org/10.1007/s10973-008-9246-1
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DOI: https://doi.org/10.1007/s10973-008-9246-1