Abstract
Samples of the copper-cadmium ferrite series Cd x Cu1−x Fe2O4 (x=0 to 1) have been investigated by means of Mossbauer spectroscopy at 77 K. Mossbauer spectra forx=0.0 to 0.7 suggest the existence of two hyperfine fields, one due to the Fe3+ tetrahedral ions (A-sites) and the other due to the Fe3+ octahedral ions (B-sites), while forx=0.8 it shows relaxation behaviour and forx⩾0.9 it exhibits a paramagnetic quadrupole doublet. The systematic dependence of the isomer shifts, line widths, quadrupole interactions and nuclear magnetic fields of57Fe3+ 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 is explained on the basis of the A-B and B-B supertransferred hyperfine interactions. Analysis of the average Mossbauer line widths as a function of cadmium concentration suggests that the relaxation spectrum observed atx=0.8 (77 K) is possibly due to domain wall oscillations. It has been found here that QS (B) increases from CuFe2O4to CdFe2O4 as the cadmium concentration is increased.
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