Abstract
The anatase-rutile phase transformation of TiO2 containing various Cu2+ amounts of Cu ions was investigated in argon atmosphere by means of X ray diffraction and electron spin resonance spectroscopy. The samples were prepared by the sol-gel method from titanium(IV) isopropoxide and copper(II) nitrate. The amorphous samples were calcined in argon atmosphere for 2 h at different temperatures. In the presence of Cu2+, the anatase-rutile transition temperature is lower than the corresponding one in pure TiO2. The transformation in argon atmosphere changes the transition temperatures due to the spontaneous reduction of Cu2+ and Ti4+ ions to metallic copper and Ti3+ respectively. The broadening of the electron spin resonance spectra from this ion show that Ti3+ ions are present in different sites into the TiO2 lattice. This are confirmed by electron spin resonance and allowed us to follow the phase transformation in detail.
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Cordoba, G., Padilla, J., Lara, V.H., Arroyo, R. (2003). Anatase-Rutile Phase Transformation of Cu2+ Doped TiO2 in a Non-Reducing Atmosphere. In: López, T.M., Avnir, D., Aegerter, M. (eds) Emerging Fields in Sol-Gel Science and Technology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-0449-8_21
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DOI: https://doi.org/10.1007/978-1-4615-0449-8_21
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