In this project, the deep green power from spinel cobalt chromite (CoCr2O4) nano-crystals carried out using the coprecipitation method and then calcinated at 600 o C for 4 hours.This produced nano-crystal (spinel CoCr2O4) fabricated using the ultrasonic technique to link it with zirconium dioxide (ZrO2) in ratios 1:2 and 1:3, respectively.The X-ray diffraction (XRD), scan electron microscopy (SEM)...