Abstract
The self-consistent potential-induced breathing model is applied to calculate vibrational modes in MgO using the frozen phonon method. The model gives the frequency difference between longitudinal and transverse optic modes expected for a non-polarizable ion system, which removes a deficiency in the earlier non-self-consistent potential-induced breathing model. For large amplitudes the longitudinal optic mode energy is lowered from its harmonic value by charge transfer.
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