Abstract
Samples of the magnetism-zinc ferrite series Zn x Mg 1− x Fe 2O 4 ( x = 0.0 to 1.0) have been studied by the Mössbauer effect technique at 77 K. Mössbauer spectra for x = 0.0 to 0.6 suggest the existence of two hyperfine fields, one due to the Fe 3+ tetrahedral ions ( A-sites) and the other due to the Fe 3+ octachedral ions ( B-sites), while for x=0.7 it shows relaxation behaviour and for x⩾0.8 it exhibits a paramagnetic quadrupole doublet. The variation of nuclear magnetic fields at the A and B sites is explained on the basis of the AB and BB supertransferred hyperfine interactions. Analysis of the average Mössbauer line width as a function of zinc concentration suggests that the relaxation spectrum observed at x=0.7 (77 K) is possibly due to domain wall oscillations.
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