Crystalline phases of titanium(IV) phosphate have been obtained from titanium(III) chloride in phosphoric acid solutions. The alpha-titanium phosphate synthesis is possible at low temperature (60-80 degrees C). gamma-Titanium phosphate is obtained by reflux with very concentrated phosphoric acid in 3-5 hours by oxidation with O-2. The influence in these reactions of several factors (concentration of reagents, molar ratio P:Ti in the reaction mixture, temperature and reaction time) was studied. The alpha-titanium phosphate formation takes place in several steps through the sequential formation of amorphous titanium(IV) phosphate, gamma-titanium phosphate and/or a semicrystalline titanium(IV) hydroxophosphate, Ti(OH)(2)(HPO4). H2O.