Polyhedral α-Fe(Ga)OOH particles were prepared by a catalytic phase transformation method using co-precipitate of Fe(III) and Ga(III) as a precursor. The effect of various factors such as the concentration of Ga(III) ions, the level of Fe(II) on the formation of these α-Fe(Ga)OOH particles was investigated. The product was characterized by XRD, IR, SEM, TEM and ED. The result shows that these α-Fe(Ga)OOH particles can be prepared at initial pH 9, molar ratio nFe(II)/nFe(III)＝0.02 and nGa(III)/nFe(III)＝0.18 under the condition of boiling and refluxing. Gallium incorporated into α-FeOOH particles takes an action to modulate the morphology of α-FeOOH. These α-Fe(Ga)OOH particles have been confirmed to be single crystal particles by ED pattern.

Key words: Ga-doping, α-Fe(Ga)OOH, single crystal particle, catalytic phase transformation