Abstract
Fe2SiO4, an end member of Mg-rich (Mg,Fe)2SiO4 olivine is a major mineral in Earth’s upper mantle. The investigation of lattice dynamical properties of spinel form of magnesium-iron orthosilicate, (Mg,Fe)2SiO4, is of high interest due to its geophysical importance. Hence, in the present study, the zone center phonons in Fe2SiO4 spinel are investigated using a short-range force constant model involving interatomic interactions upto first three neighbours. The theoretically obtained Raman and infrared frequencies are compared and analyzed with experimental results and are found to be in good agreement. The phonon dispersion curve and phonon density of states have also been calculated for γ-Fe2SiO4. The absence of any imaginary phonon frequency in the phonon spectra indicates that the material is dynamically stable in the spinel structure.
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