Ab Initio calculation of the vibrational spectrum and thermodynamic properties of rhombohedral P4O10

Details Ab Initio calculation of the vibrational spectrum and thermodynamic properties of rhombohedral P4O10 Ab Initio calculation of the vibrational spectrum and thermodynamic properties of rhombohedral P4O10

2011-06-28

arxiv.org/abs/1106.5824v1

Physics

Condensed Matter

Materials Science

5 pages, 3 tables, 2 figures

Scientific paper

Plane-wave pseudopotential methods and density functional perturbation theory are used to calculate the phonon density of states and thermodynamic functions of h-P4O10. The calculated vibrational spectrum is in good agreement with the measured spectrum, but the calculations indicate some modifications in the interpretation of the spectrum, mainly suggesting changes in the number of components used to fit a few of the observed peaks. The calculated low-temperature heat capacity is in good agreement with the measured heat capacity, with a systematic offset of approximately -5 J mol-1 K-1, independent of temperature. . Comparison with molecular calculations indicate that molecular contributions make up about 80% of the heat capacity of h-P4O10

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