Investigations on physical properties of Mg ferrite nanoparticles for microwave applications

Nanocrystalline Mg-ferrites have been synthesized by sol-gel auto combustion method using citric acid as fuel agent at different Calcination temperatures (200 °C, 400 °C, 600 °C, and 800 °C). The physical properties of nano Mg-ferrite were investigated using X-ray diffraction (XRD) analysis, scanning electron microscopy, Fourier-transform infrared spectroscopy, and LCR-Hitester for structural, surface morphology, functional groups and dielectric properties respectively. The single-phase cubic spinel structure of all the samples has been confirmed by XRD. Surface morphology studies reveal that the grains are clear with well-defined grain boundaries and also found that the average grain size is maximum at 600 °C calcination temperature. The dielectric studies reveal that the maximum dielectric constant is attained a value of 46 with the minimum dielectric loss at 600 °C calcination temperature.