Abstract
In present research communication, the synthesis of Zn 1−x Mg x O (x = 0.00, 0.05, 0.10, 0.15, and 0.20) nanoparticles has been carried out by sol–gel route. X-ray diffraction (XRD) patterns reveal the hexagonal structure of ZnO without the formation of any extra phase. Transmission electron microscopy (TEM) study indicates the spherical shape of nanoparticles, having an average particle size of 17 nm for undoped nanoparticles. The particle size has been found to be decreasing with the increase in Mg-doping concentration. High-resolution transmission electron microscopy (HRTEM) predicts the well crystalline nature of nanoparticles without any segregated extra phase or impurity, in agreement with energy dispersive spectroscopy (EDS). Electron spin resonance (ESR) analysis indicates the defects mediated long-range ferromagnetic interaction. Magnetization versus applied magnetic field (M– H) curves registers a decrease in saturation magnetization value with increase of Mg-doping concentration which can be related to decrease of oxygen vacancies in host nanoparticles. The dielectric versus frequency response has been explained by Maxwell–Wagner interfacial model. Improved ferroelectric behavior has been observed with Mg-doping concentration.
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