Effect Of Zn doping On Structural And Dielectric Properties Of Tetragonal Ni_(1-x)Zn_xFe_2O_4 (0.0 ≤ x ≤ 0.5)

摘要

A series of Ni-Zn ferrite with compositional formula Ni_(1-x)Zn_xFe_2O_4 (0.0 ≤ x ≤ 0.5) were prepared by solid-state reaction route. The influence of the Zn content on the structural and dielectric properties of NiFe_2O_4 was investigated using X-ray powder diffraction (XRD), Raman spectroscopy and dielectric measurements. XRD analysis reveals that the samples are polycrystalline single-phase cubic spinel in structure excluding the presence of any secondary phase corresponding to any structure. Slight variation in the lattice parameter of Zn doped NiFe_2O_4 has been observed due to difference in ionic radii of cations. Raman analysis reveals the doublet like nature of A_(1g) mode for all synthesized samples. Small shift in Raman modes and increment in the line width has been observed with the doping ions. Furthermore, room temperature dielectric properties of all the prepared samples have been reported. It is observed that for each sample the dielectric constant decreases with an increase of frequency and becomes constant at higher frequencies.