Hyperfine interaction studies in the doped lithium ferrite system Li0.5+0.5xCr0.3TixFe2.2-1.5xO4

Abstract

Mossbauer spectra of Li_0.5+0.5xCr_0.3Ti_xFe_2.2-1.5xO₄ with x varying from 0.0 to 1.0 in steps of 0.2 have been obtained at 300 K and 78 K. The effect of Ti⁴⁺ substitution on the various hyperfine interactions has been discussed. For lower Ti⁴⁺ concentrations (0.0 and 0.2) the spectra showed a clear Zeeman pattern whereas, for x>or=0.4, a central quadrupole doublet was present together with the magnetic sextet at both temperatures. The intensity of the doublet was observed to increase with increase in Ti⁴⁺ content. This anomalous behaviour of the Mossbauer spectra in the present system has been discussed.