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The spinel-type ferrites NiFe 2 O 4  and Zn 0.5 Ni 0.5 Fe 2 O 4  modified by lanthanide ions Eu 3+  and Tb 3+  were prepared by a sol-gel process with propylene oxide as a gelating agent. The phase homogeneity of the samples was tested by XRD and Mössbauer spectroscopy. Transmission electronic microscopy used for characterisation of the morphology of the samples revealed nanosized powdered samples with a narrow distribution of particle sizes. It was noted that the presence of Ln 3+  ions influenced the magnetic properties of nanosized NiFe 2 O 4  and Ni 0.5 Zn 0.5 Fe 2 O 4  ferrites. The dependence of the magnetic properties of the samples on the rare-earth doping may be explained by the different grain sizes. The saturation magnetisation tends to decrease with increasing rare-earth doping and decreasing crystallite size. A similar trend was observed for the coercive field, with the exception of the Tb 3+  -doped Zn 0.5 Ni 0.5 Fe 2 O 4  where it remained the same as in the pure ferrite.

Magnetic properties of binary and ternary mixed metal oxides NiFe 2 O 4 and Zn 0.5 Ni 0.5 Fe 2 O 4 doped with rare earths by sol—gel synthesis