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Acoustic and some optic phonon branches have been observed by means of inelastic neutron scattering in magnetite at room temperature and near the Verwey transition at Tv = 119 K. No appreciable effect on the phonon spectrum was found in passing Tv. Sound velocities determined at room temperature were found to agree only moderately with ultrasonic data, and they show marked deviation from cubic symmetry, which possibly could be interpreted in terms of anharmonic effects.
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Sämuelsen et al. (1974) studied this question.
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