Mössbauer Studies of Tix(Fe2−2xM1+x)O4 and Gex(Fe2−2xM1+x)O4 (M  Co and Ni)

Abstract

M. bI. EL-OCKER et al.: Mossbauer Studies of Ti, Ge,(Fez-z,M1+2)04 (M = Co and Ni) 205 phys. stat. sol. (a) 158, 205 (1996) Four ferrite systems have been prepared by the ceramic method. The investigated systems are Ti,(Fe2-22Ml+,)04 and Ge2(Fe2-2,M1+,)04, M = Co and Ni, where x = 0.25 and 0.5 for Ge,(Fez-bMlcz)04 and x = 0.25, 0.5, and 0.75 for Ti,(Fe~-~M1+,)04. The obtained Mossbauer spectra reveal the presence of magnetic hyperfine interaction in all samples except for Ti0,~5Co1.75Feo.504. It was observed also that all Mossbauer parameters magnetic hyperfine field, quadrupole splitting, and isomer shift, depend on x. However, the estimated parameters show different dependence on x. In all cases the magnetic hyperfine field Hhf decreases with increasing z except that of Ti,Nil+,Fe2-&4,where Hhf increases for x = 0.75. The obtained results have been discussed in the frame of current theories.

The role of Dy3+ ions and sintering temperature on the magnetic characterization of LiCo-Ferrite

“…They suggested the possibility of noncollinear spin arrangement to explain the magnetization measurement. It is reported by el-Ocker [16] that for Ti 0:2 Co 1:2 Fe 1:6 O 4 ferrites Ti 4þ ions enter at octahedral (B) sites.…”