Mössbauer effect study of the MnxZnyNizFe2O4

A⁵⁷Fe Mössbauer effect study of the triangular Mn_xZn_yNi_zFe₂O₄ system at 78 K has been undertaken. The mean values of the hyperfine magnetic field, the values of standard deviations and the asymmetry parameters have been derived from the distribution diagrams of the hyperfine magnetic field. The dilution process affects only slightly the A-site hyperfine field but it is responsible for a wide distribution of the B-site field. For the highly diluted samples, relaxation processes play an important role. The results of Mössbauer effect investigations can be understood in terms of the lack of the Zn₂₊-O-Fe₃₊ magnetic coupling and the weaker Mn₂₊-O-Fe₃₊ and Ni₂₊-O-Fe₃₊ superexchange interactions as compared to the Fe₃₊-O-Fe₃₊ interactions.