High entropy spinels are growing due to the possibility of tuning the properties. They are applicable in many fields such as medical, pollutant degradation, microwave absorbers, and many others. Research focus on In this work, nanostructured high entropy spinel was fast synthesized under microwave radiation by a polymeric precursor method. The composition chosen for this work was an equimolar (Mn,Co,Cr,Ni,Fe)3O4 spinel. After dried, the polymeric-precursor was thermally decomposed by conventional and microwave heatings (800°C and 900°C), for 20 and 60min respectively. The same precursor was conventional thermally treated with a holding time of 60min. The samples were characterized by their crystallinity (XRD), morphology and chemical composition (STEM and HRTEM), bandgap, and magnetic properties. After saving 85% of the time, the microwave-assisted decomposition allowed monophasic material with lower crystallite size (45 and 60nm for microwave and conventional synthesis.
Acknowledgments: CAPES (Finance code 001), FAPESP (grants 2017/13769-1 and 2019/25921-8), and CNPq.