Large-Scale Fabrication of Nanosized Cobalt Chromite Spinel by a Simple Thermal Treatment Method

Considering the advantages of thermal treatment method for preparing nanocystalline such as high flexibility, reproducibility, low cost production, environmentally friendly and easy handling, the present work reports the large scale synthesis of spinel cobalt chromite nanoparticles. Structural and paramagnetic properties of obtained nanoparticles in different calcination temperatures were investigated using various characterization techniques. The XRD and FT-IR spectra confirmed the formation of spinel phase cobalt chromite (CoCr2O4) in the calcination temperature between 650 and 950 degrees C. The average particle sizes and degree of crystallinity increased with increasing the calcinations temperature. The estimated average sizes from TEM images were similar to 13 and 51 nm for lowest and highest calcination temperatures, respectively. The calcined sample at 950 degrees C showed paramagnetic behavior with g-factor of 1.92 and resonance magnetic field of 343.31 Oe. In calcination temperatures below than 950 degrees C there was no clear resonance signal probably due to the dipole-dipole and super-exchange interactions.