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The brookite-phase TiO 2 was prepared by a hydrothermal synthesis of titanium chloride solution. The thermolysis time and the pH value of the solution were controlled during the synthesis. X-ray diffraction experiments showed that TiO 2 powders partially containing the brookite-phase were successfully obtained. A great amount of OH -in the reaction solution was found to be important to obtain the brookite phase because the intermediate complex leading to the brookite phase consumes more OH − than other phases like the rutile.brookite phase, titanium chloride solution, hydrothermal synthesis

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