Electron microscopic and x-ray diffraction investigation of the process of formation of nickel hydroxide during precipitation

Abstract

1. Morphological changes in nickel hydroxide particles, which are formed during the entire process of precipitation from nickel nitrate in a solution of ammonia at constant pH, were described. 2. A transition of the amorphous phase to a crystalline phase was detected by x-ray diffraction study. 3. An analysis of the causes (change in the degree of supersaturation of the solutions with time depending; upon the pH and tendency to approach the equilibrium forms of the crystals according to the Gibbs-Wulf principle), responsible for the change in the form of the particles during the precipitation and aging of nickel hydroxide, was given.