Dielectric performance of nanostructured magnesium oxide and effect of cobalt substitution

Abstract

Here, we examined effect of Co substitution on dielectric characteristics of MgO nanostructures at various doping concentrations with the view to finding its use as a capacitor. The grain and grain boundary have significant impact on the dielectric characteristics' temperature and frequency dependency. Pure and Co doped MgO nanostructures showed dramatic drop in their dielectric constant and dielectric loss with increasing frequency. Reverse micelle micro emulsions of water-cyclohexane-CTAB ternary oil-surfactant-water systems were used to synthesize both pure and Co doped MgO nanostructures. Energy-dispersive X-ray spectroscopy (EDX), powder X-ray diffraction (PXRD), dynamic light scattering based particle size analysis (DLS-PSA), photoluminescence (PL), and Raman spectroscopy were used to analyze the synthesized materials. Different frequency and temperature range were studied for the complex permittivity of dielectric characteristics (ε * = ε'-jε") and the loss tangent (tanδ) and based on the experimental data, ε', ε", tanδ decreases as frequency and temperature increase.