Preparation of Nano-fcc Structure Co Powders by High Speed Ball Milling

Abstract

High-energy ball mill of a mixture of H2C2O4·2H2O, Co (NO3)2·6H2O(A.R) 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 obtain cobalt powders. The microstructure of the powders produced using ball milling and thermodynamical analysis for reaction and decomposition temperature have been studied. The powders were characterized by X-ray Diffraction, Scanning Electron Microscopy. It has been identified that a spherical, fcc structure, 100nm β-Co powders was synthesized.