Structural Modification of Doped and Undoped Nanocrystalline TiO2 by Temperature-Resolved XRPD
Advances in Science and Technology Vol. 51 (2006) pp. 99-104
F. Matteucci 1, G. Cruciani 2, M. Dondi 1, G. Baldi 3, M.C. Dalconi 2, A. Barzanti 3, G. Lorenzi 3, C. Meneghini 4,
1 ISTEC-CNR, Institute of Science and Technology for Ceramics, Via Granarolo 64, 48018 Faenza, Italy
2 Department of Earth Sciences, University of Ferrara, Via Saragat 1, 44100 Ferrara, Italy
3 CE.RI.COL., Colorobbia Research Centre, Via Pietramarina 53, 50053 Sovigliana-Vinci (Fi), Italy
4 Amaldi Physics Department, Roma Tre University, Via della Vasca Navale 84, Roma, Italy
Nanocrystalline titania pigments were produced by a novel synthesis route consisting of a high temperature forced hydrolysis in a coordinating high-boiling solvent. The effect of synthesis conditions as well as doping with Cr, Sb and V on the particle size and on the anatase-to-rutile transformation was studied by temperature-resolved synchrotron powder diffraction. The experiments were performed directly on as-synthesized low concentration suspensions of titania Nanoparticles (up to 230°C) and on dried titania nanoparticles (up to 950°C). Crystallite size of as-synthesized nanoparticles is in the 5 to 50 nm range, being affected by the synthesis conditions as well as by doping and exhibits a slow-rate coarsening trend with temperature. The anatase-to-rutile transformation is drastically influenced by both synthesis conditions and doping. In particular, doping affected the anatase-to-rutile transformation rate, while the synthesis conditions influenced the phase composition, causing the appearance of brookite.
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