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Ionic ordering in the low-temperature phase of magnetite

N. M. KovtunPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskA. A. ShemyakovPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, Donetsk

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NMR spectra of magnetite recorded at helium temperatures are used to construct a model of the ionic ordering in which a characteristic feature is the appearance of ordering along the three axes of the low-temperature cell. It is shown that ions of divalent iron have different spin densities at the nuclei.

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