Abstract
Ni0.25Cu0.30Zn0.45DyxFe2−xO4 (x = 0.0, 0.025, 0.05, 0.075, 0.1 and 0.125 mol.%) ferrimagnetic samples have been prepared by sol–gel autocombustion route. The lattice parameter (a) increases with dysprosium concentration indicating the expansion of unit cell as observed from XRD studies. As the dysprosium content increases minor orthoferrite phase is seen in the samples. The porosities of samples increase indicting crystal imperfections. Using Hall-Williamson analysis, the crystallite size was found to vary between 24.36 nm to 37.1 nm. From Fourier transform infrared spectroscopy (FTIR), two absorption bands ν1 and ν2 corresponding to the intrinsic vibrations of tetrahedral and octahedral sites respectively are observed which confirm the spinel phase formation and ascertain the cation distribution in the samples. The transmission electron micrographs exhibit spherical shape and narrow size distribution of nanoparticles. The sintered ferrite samples exhibit usual dielectric dispersion involving Maxwell-Wagner type interfacial polarization. A decrease in dielectric constant, dielectric loss tangent and AC conductivity with frequency is observed.
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