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- W2062499863 abstract "Neglecting the relative core-shell displacements at equilibrium the usual shell model formalism is applied to the rutile structure. A number of models of increasing complexity ranging from the simplest rigid-ion model to the full shell model (with both ions polarizable) are presented. When applying these various models to magnesium fluoride (MgF2) it is found that a simplified shell model is already able to account for the experimental phonon spectrum. Such a comparison is based on optical data for the zone-centre frequencies, and on extensive inelastic neutron scattering measurements of dispersion curves in three symmetry directions and over a frequency range from 0 to 10 THz. Using best-fit values for the model parameters a number of dielectric properties for MgF2 are calculated and compared with existing data." @default.
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- W2062499863 date "1974-08-07" @default.
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- W2062499863 title "Lattice dynamics of magnesium fluoride" @default.
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- W2062499863 doi "https://doi.org/10.1088/0022-3719/7/15/011" @default.
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