nano powders high energy ball mill
· Preparation of Nano fcc Structure Co Powders by High Speed . High energy ball mill of a mixture of H2C2O4 2H2O Co NO3 2 6H2O has been used to produce nanocrystalline cobalt oxalate powders of nearly spherical shape After the CoH2C2O4 2H2O powders have been dispersed by spray drying it has been decomposed at 400 550°C to .