Phonon Density of States and Specific Heat of Forsterite, Mg2SiO4

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Science  03 Apr 1987:
Vol. 236, Issue 4797, pp. 64-65
DOI: 10.1126/science.236.4797.64


The phonon density of states of the geophysically important mineral forsterite has been calculated with a rigid-ion model, which gives good agreement with an experimental measurement by inelastic neutron scattering. The density of states has been used to calculate the specific heat as a function of temperature, the results of which are in excellent agreement with calorimetrically measured values. The rigid-ion model takes account of the interatomic interactions and normal modes of vibration on a detailed microscopic basis, and is therefore more realistic than the Debye and other empirical models used previously.