Abstract
The magnetic properties of the Cd x Cu 1− x Fe 2O 4 ferrite system ( x = 0 to 1) have been investigated by means of Mossbauer Spectroscopy. Mossbauer 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 Fe 3+ octahedral ions ( B-sites), while for x = 0.7 it shows relaxation behaviour and for x ⩾ 0.8 it exhibits a paramagnetic quadrupole doublet. The systematic dependence of the isomer shift, quadrupole interactions and nuclear fields of 57Fe 3+ ions in both A- and B-sites has been determined as a function of cadmium content. The variation of nuclear magnetic fields at the A- and B-sites are explained on the basis of A-B and B-B supertransferred hyperfine interactions. Analysis of the relaxation spectrum observed at x = 0.7 (300 K) suggests that the relaxation mechanism is due to domain wall oscillations. It has been found here that the QS increases from CuFe 2O 4 as the cadmium concentration is increased.
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