Dielectric and optical band gap studies of nanostructured manganese nickel oxide and cobalt nickel oxide

Abstract

Nano oxides of Manganese Nickel and Cobalt Nickel were synthesized by chemical co-precipitation method from the reaction of respective metal sulfides of manganese, nickel, cobalt and sodium carbonate using ethylene diamene tetra acetic acid as an effective capping agent. The carbonate precursors were heated at different temperatures so as to form their oxides. Through the X-ray line broadening technique, the mean particle sizes were calculated at different temperatures. The elastic micro strains versus particle size variations were thoroughly studied. The metal oxide formations of Manganese Nickel and Cobalt Nickel were confirmed with the help of FTIR spectra. EDX spectra of Manganese Nickel oxide and Cobalt Nickel oxide provide chemical composition of the samples. The crystallite shapes were studied using the scanning electron microscopy images. The optical direct band gap values of both Manganese Nickel and Cobalt Nickel oxides were calculated using Tauc’s relation.