Sintering and mass transport features of (Sn,Ti)O2 polycrystalline ceramics |
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| Affiliation: | 1. Universidade Federal de São Carlos, C.P. 676, CEP 13565-905, São Carlos, SP, Brazil;2. Universidade Estadual de São Paulo, C.P. 335, CEP 14800-900, Araraquara, SP, Brazil;1. Leibniz Institute of Photonic Technology (IPHT), P.O.B. 100239, D-07702, Jena, Germany;2. Institute of Organic Chemistry and Macromolecular Chemistry, Friedrich Schiller University of Jena, Humboldtstraße 10, D-07743, Jena, Germany;3. Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Lotharstr. 1, D-47057, Duisburg, Germany;4. Institute of Fluid Mechanics, Technische Universität Dresden, Dresden, 01062, Germany;1. Academic Section of Ophthalmology, Larry A Donoso Laboratory for Eye Research, Division of Clinical Neuroscience, University of Nottingham, Nottingham, United Kingdom;2. Department of Ophthalmology and Visual Sciences, University of British Columbia, Vancouver, Canada;3. LaserVision, Nuffield Health Hospital, Guildford, United Kingdom;4. Department of Ophthalmology, National Eye Technology Centre, University of Chieti-Pescara, Chieti, Italy;1. Leibniz Institute of Photonic Technology (IPHT), P.O.B. 100239, Jena, D-07702 Germany;2. Institute of Organic Chemistry and Macromolecular Chemistry, Friedrich Schiller University of Jena, Humboldtstrasse 10, Jena, D-07743 Germany |
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| Abstract: | Different (Sn,Ti)O2 compositions were sintered at 1450 °C for 2 h with the purpose of investigating their sintering and mass transport properties. Highly dense ceramics were obtained and their structural properties studied by X-ray diffraction and scanning electron microscopy. The changes in lattice parameters were analyzed by the Rietveld method and two mass transport mechanisms were observed during sintering in different temperature ranges, evidenced by the linear shrinkage rate as a function of temperature. The effect of the concentration of TiO2 on mass transport and densification during sintering was analyzed by considering the intrinsic defects. System densification was attributed to a mass transport mechanism in the SnO2 matrix, caused by the presence of TiO2, which formed a solid solution phase. The change in the mass transport mechanism was attributed to chemical bonding between SnO2 and TiO2, which improves ionic diffusion as the concentration of TiO2 increased in (Sn,Ti)O2 compositions. |
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