Abstract
The room temperature structural, optical and dielectric properties of Mg0.95Mn0.05O and Mg0.95Mn0.01TM0.04O (TM = Co, Ni, and Cu) nanoparticles are reported. All transition metal nanocrystalline samples were successfully prepared by sol–gel auto combustion method. X-ray powder diffraction patterns at room temperature confirmed the formation of single-phase cubic structure with an Fm3̄m space group for all prepared samples. Slight variation in the lattice parameter of TM doped Mg0.95Mn0.05O has been observed. Using Rietveld refinement of XRD data, the space group and lattice parameters are determined. Scanning electron microscopy (SEM) measurements were performed to understand the morphology and grain size of the Mg0.95Mn0.01TM0.04O (TM = Co, Ni, and Cu) nanocrystals. The estimated band gaps as calculated by using UV-Vis spectroscopy are found to be 3.59, 3.61, 5.63 and 3.55 eV for Mg0.95Mn0.05O and Mg0.95Mn0.01TM0.04O (TM = Co, Ni, and Cu) nanocrystals, respectively. Both dielectric constant and dielectric loss is found to decrease due to TM (transition metal) doping. The ac conductivity is found to increase with increase in frequency. Electric modulus spectra reflect the contributions from grain effects: the large resolved semicircle arc caused by the grain effect. The results obtained in this study were discussed comparatively with those cited in the literature.
Highlights
IntroductionNanomaterials based on metal oxides with high surface to volume ratio have allured considerable interest from the research and scienti c community due to their conceivable applications in the eld of optoelectronics, nanoelectronics and sensing devices
Nanostructures have potential applications in modern science and technology due to their intriguing structural and optical properties.[1,2] Recently, nanostructures based on oxides have received considerable attention from researchers of the elds of material science, physics and chemistry[3,4] due to the presence of oxygen, a highly electronegative element, which exhibits the tendency of pulling the bonding electrons towards itself and away from the other elements thereby inducing substantial electric eld at the interatomic scale.[5]Nanomaterials based on metal oxides with high surface to volume ratio have allured considerable interest from the research and scienti c community due to their conceivable applications in the eld of optoelectronics, nanoelectronics and sensing devices
Mg0.95Mn0.05O based transition metal doped powders at the temperature of 600 C have been structurally characterized by room temperature X-ray powder diffraction (XRD)
Summary
Nanomaterials based on metal oxides with high surface to volume ratio have allured considerable interest from the research and scienti c community due to their conceivable applications in the eld of optoelectronics, nanoelectronics and sensing devices. Magnesium oxide (MgO) is a fascinating basic oxide that has potential applications in catalysis, adsorption, synthesis of refractory ceramics,[6,7] nano electronics, optoelectronics and sensing devices[8] and superconductor products.[9]. Adsorption, catalyst supports, and optical sensors are the areas where metal oxides are especially used. Besides these, they are used in biocompatibility, bioimaging[10] and many other
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