Effect of Sm3+-Gd3+ co-doping on dielectric properties of Mn-Zn ferrites synthesized via combustion route

Abstract

Nanocrystalline Mn 0.4 Zn 0.6 Sm x Gd y Fe 2-(x+y) O 4 where x and y = 0.01,0.02,0.03,0.04 and 0.05 were synthesized by Solution combustion method. The as prepared samples were characterized by X-ray diffractometer (XRD), Transmission electron microscopy (TEM) and Vibrating sample Magnetometer (VSM) at room temperature. From the XRD the crystallite size were found increases with the increase of Sm 3+ -Gd 3+ ions concentration while lattice parameter found to decreases. The real and imaginary part of permittivity (ε′ and ε′′) were undertaken in the wide frequency range 1GHz to 5GHz at room temperature. It is found that the real and imaginary part of permittivity's are increasing with increasing Sm 3+ and Gd 3+ concentration. The magnetic behaviour of as synthesized nano ferrites reveals that, the saturation magnetization (M S ), remanence magnetization (M R ) is increasing with increasing Sm and Gd concentration. The g-value, peak-to-peak linewidth and spin concentration evaluated from EPR spectra correlated with cations occupancy. These electromagnetic properties clearly indicates that the synthesized materials are the good candidates for L and C band frequency.

Effect of Ce3+ substitution on the structural, morphological, dielectric, and impedance spectroscopic studies of Co–Ni ferrites for automotive applications

“…This result tells a good agreement exists between the calculated and observed diffraction pattern. Peak width of (311) peak is used to estimate the crystallite size of the as-synthesized samples using Debye-Scherrer formula [18].…”

Dielectric Relaxation and Suitability of Scaling parameters study on Mn0.7+xZn0.3SixFe2-2xO4 (x = 0.0 - 0.3) Ferrites

“…Restricted to recent (2016-2020) reports on dielectric properties of ZnxMn1-xFe2O4 (x = 0.0 to 1.0) spinel ferrites synthesized by solid-state reaction method [11][12], sol-gel route [13], combustion process [14], microwave-induced urea-nitrate process [15] are available in the literature. On the other hand, divalent Cr 2+ -substituted ferrites, Mn0.5Zn0.5-xCrxFe2O4 (x = 0.0, 0.3 and 0.5) [16] and cobaltites, Mn0.5Zn0.5-xCrxCo2O4 (x = 0.0, 0.3 and 0.5) [17], trivalent cation Gd 3+ -substituted Mn0.5Zn0.5GdxFe2-xO4 prepared by facile coprecipitation method [18] and chemical co-precipitation route [19], Nd 3+ -substituted Mn0.5Ni0.1Zn0.4GdxFe2-xO4 (x = 0.0 to 1.0) synthesized by usual double ceramic method [20] as well as Sm 3+ -Gd 3+ co-substituted Mn0.4Zn0.6SmxGdyFe2-(x+y)O4 system prepared by microwave hydrothermal route [21] and tetravalent titania (Ti 4+ ) ions substituted Mn0.5Zn0.5TixFe2-4/3xO4 (x = 0.0 to 0.5) prepared by hydrothermal method [22] have been reported. Couple of research articles describing dielectric behaviour of Mn0.4Zn0.6Fe2O4 + Co0.4Zn0.6Fe2O4 composites [23] and CaCu3Ti4O12 (0.0 to 0.5 wt %) doped Mn-Zn ferrites [24] are also available.…”