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Several compositions of mixed manganese??magnesium ferrite, MgyMn1-yFe2O4 have been examined by neutron diffraction in order to determine the distribution of the manganese cations and the position of the oxygen anions in the spinel lattice. The compounds chosen, with y = 0.25, 0.50, 0.75 and 0.90, were quenched from both 1400?? and 1000?? C. For all the samples dealt with the results indicate that...