Synthesis, Structural and Magnetic Properties of Substitutional Nanoscale Nickel Ferrites by Sol-Gel Method
Abstract
In this report we have prepared the single phased polycrystalline samples of inverse spinel Ni0.5(Mg0.5-xZnx)Fe2O4 (x = 0.0 - 0.5), using sol-gel technique and reported its structural and magnetic properties. Structural analysis reveals the series is crystallizes into cubic structure in ????????3̅???? space group. A rise in the lattice parameters including unit cell volume are noticed with Zn concentration. An increase in the average crystalize size has been obtained and a drop in the micro strain parameter. Further confirmation of spinel structure is done from FTIR spectra. A decrease in energy band gap with the Zn doping has been observed from the study of UV-Visible spectrum. M-H loops measured at 300 K show a typical ferrimagnetic loop with a clear saturation. At 300 K, (M-H) loops demonstrate an increase in coercivity (HC) and retentivity (Mr) value after Zn substitution. However, the observed saturation magnetization (MS) shows some abnormal change attributed to the movement of some of the Zn ion to the tetrahedral site.
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