Physics
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...58..141g&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 58, Issue 2-3, p. 141-154.
Physics
23
Scientific paper
High pressure (up to 2.7 GPa) and high temperature (up to 1000 K) Raman spectra of Ca2GeO4 (olivine form) have been recorded. Measurements of the pressure- and temperature-induced frequency shifts of 14 modes have been performed. The classical mode Gruneisen parameter and a corresponding parameter related to temperature variation are calculated. For the high frequency modes (Ge-O stretching) we calculate these parameters with local tetrahedral elastic parameters. From these parameters anharmonic parameters are calculated for each Raman active mode. The effect of anharmonicity on the specific heat is calculated and compared with calorimetric data. Taking anharmonicity into account leads to a departure from the Dulong and Petit limit of the order of 2% at 1000 K and more than 6% at 2000 K, in good accord with experimental data. We propose that, eventually, such effects might be significant in the calculations of thermodynamic properties of mantle silicates like forsterite and its polymorphs.
Gillet Philippe
Guyot Francois
Malézieux Jean-Marie
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