University of Tehran Journal of Ultrafine Grained and Nanostructured Materials 2423-6845 45 1 2012 10 01 Ultrasonic–Assisted Co–Precipitation Method of Preparation of Nanocomposites in The Al2O3–TiO2–ZrO2 System: Characterization and Microsturcture 7 12 29314 10.7508/jufgnsm.2012.01.002 EN M Saeidi School of Metallurgy & Materials Engineering, Iran University of Science & Technology Hossein Sarpoolaky School of Metallurgy & Materials Engineering, Iran University of Science & Technology S. M. Mirkazemi School of Metallurgy & Materials Engineering, Iran University of Science & Technology Journal Article 2015 10 27 Recently, the Al2O3–TiO2–ZrO2 system has found valuable applications, particularly, as a support for NOx <br />storage–reduction (NSR) catalysts. Nanocomposite powders were prepared from the co-precipitation method <br />in inorganic precursors. The behaviors of mixed oxide nanoparticles under ultrasonic irradiation, such as <br />dispersion, and crushing were studied. Phase transformations, crystallite size, and microstructure of the <br />mixed oxides were investigated by STA (DTA/TG), FTIR, XRD, and SEM. XRD studies showed that <br />zirconium titanate (ZT) is main phase, and the crystallite size varies with the final calcination temperature, <br />and ultrasonic irradiations. SEM observations revealed that the calcination temperature strongly influences <br />the morphology of prepared mixed oxides. The results showed that the inorganic nanoparticles in the <br />aqueous solution can be redispersed more effectively by ultrasonic irradiation than by conventional stirring. <br />The average crystallite sizes of the ZT particles heat treated at 1200 °C for 2 h were in the range of 47-85 <br />nm. https://jufgnsm.ut.ac.ir/article_29314_59f78c43727b33e818af23c9c46aa53c.pdf