Structural, dielectric and impedance spectroscopic studies of Ni0.5Zn0.5−xLixFe₂O₄ nanocrystalline ferrites

Abstract

Nanocrystalline lithium substituted Ni–Zn ferrites with composition Ni[Formula: see text]Zn[Formula: see text]Li[Formula: see text]Fe2O4 ([Formula: see text] = 0.00–0.25 in steps of 0.05) were synthesized by the citrate gel auto-combustion method and were sintered at 1000[Formula: see text]C for 4 h in air atmosphere. The structural, dielectric, impedance spectroscopic and magnetic properties were studied by using X-ray diffraction, impedance analyzer and vibrating sample magnetometer respectively. The X-ray diffraction patterns confirm that all samples exhibit a single phase cubic spinel structure. Suitable cation distribution for all compositions has been proposed by using the X-ray diffraction line intensity calculations and the theoretical lattice parameter for each composition was observed in close agreement with the experimental ones and thereby supporting the proposed distribution. An increase in the saturation magnetization was observed up to [Formula: see text] = 0.10 level of Li[Formula: see text] substitution and thereafter magnetization reduced for higher concentrations to the highest level of Li[Formula: see text] substitution. The dielectric constant and the DC resistivity of Ni–Zn–Li ferrites were noticed to decrease with increase in the Li[Formula: see text] ion concentration. The impedance spectroscopic studies by using the Cole–Cole plots were studied in order to obtain the relaxation time, grain resistance and grain capacitance. AC conductivity initially remained almost independent of frequency for lower frequencies and thereafter for higher frequencies the AC conductivity increased with increase of Lithium concentration.

Investigation of the structural, optical, elastic and electrical properties of spinel LiZn2Fe3O8 nanoparticles annealed at two distinct temperatures

“…Among these origins, the main ones are electron hopping in ferromagnetic intra-grains 69 and the simultaneous presence of multiple mechanisms. 4 It is evident that one fails to predict the dominant conducting carriers within Zn500 and Zn1100 from the current activation energy of 1366 meV and 573 meV, respectively. One of the alternative approaches is to consider the present matters in the physical sense.…”

“…For further widening this range, one of the practical hints is to fill the A-site with lithium 13 because ferrite with lithium has been found to serve as an excellent solid-state electrolyte. 4 In this paper, we elaborate and report the spinel oxide of Li 0.5 ZnFe 1.5 O 4 . Since it contains zinc with a relatively low volatilization temperature, it involves a low sintering temperature, which makes the preparation process less expensive as compared with that of other spinels.…”

“…These features elucidate why more scientic curiosity is targeted towards ferrite as compared to other spinels, as evidenced by the tremendous number of characterizations conducted on it. [3][4][5][6] It has been found that ferrite possesses many applicable distinguishable properties, 7,8 which are sensitive to composition. 6 In this context, ferrite has been treated with a wide range of chemical elements, such as Zr, Zn, 9 Ni, 10 and Co, 11 for better satisfying the requirements of today.…”