Nano-or submicron In(OH) 3 and In 2 O 3 particles of different morphologies were synthesized from a nitrate solution by a homogeneous precipitation process. By using X-ray diffractometer, thermogravimetric analysis, transmission and scanning electron microscopes, and inductively coupled plasma-optical emission spectrometry, the properties of particle growth were analyzed. The results indicated that the kinetics of the hydrolysis reaction of In 31 was a zero-order reaction with an activation energy of 128 kJ/mol, which implied that the reaction was controlled by the decomposition kinetic of urea additive. The growth anisotropic of particles, pH value of reaction solutions, residual In 31 concentration relative to aging time with different temperatures and starting concentrations were reported in this study. Calcination of the hydrate to form In 2 O 3 particles between 3001 and 9001C did not greatly change the morphologies of the particles. 527J ournal

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