Ternary and quaternary transition metal oxides, which offer a wide variety of important physical properties, are traditionally synthesized using high-temperature reactions that often require several days of heating. A new nanoparticle-directed approach for the rapid low-temperature synthesis of nanocrystalline bulk-scale ternary and quaternary transition metal oxides has been developed. Readily available metal oxide nanoparticles can serve as a robust toolkit of highly reactive reagents, which can be mixed in solution in known ratios to form nanomodulated precursors and rapidly transformed, at relatively low temperatures, into more complex oxides. This approach is initially demonstrated for pyrochlore-type Y 2Ti 2O 7 and Eu 2Ti 2O 7 using XRD, DSC, and TEM to monitor the reaction. A nanocomposite of Y 2O 3 and TiO 2 nanoparticles transforms into nanocrystalline Y 2Ti 2U 7 within 2 h of heating to 700°C, and Eu 2Ti 2O 7 forms within 2 h of heating a nanocomposite of Eu 2O 3 and TiO 2 nanoparticles to 800°C. NiTiO 3, CoTiO 3, Bi 2CuO 4, and Bi 5FeTi 3O 15 can also be synthesized.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Materials Chemistry