Thermal evolution of TiO 2ZrO 2 composites prepared by chemical coating processing

Abstract

A xZrO 2 (100− x)TiO 2 composite gel powder ( x = 50 mol%) has been prepared by chemical processing of anatase as inner core coated with in situ precipitated amorphous zirconia as outer core, which was obtained from controlled hydrolysis of zirconyl chloride using ammonia at pH=9–10. The thermal evolution of this composite is reported, showing the crystallization of metastable cubic/tetragonal zirconia at 437°C, as detected by DTA at 10°C min −1 and XRD, with activation energy of 407 ± 10 kJ mol −1, and the feasibility of preparing zirconium titanate powders by reaction of TiO 2 and ZrO 2 by heating at higher temperatures is discussed.