Short Range Order Evolution in the Preparation of SnO2 Based Materials
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Resumo
The evolution of Eu3+ doped SnO2 xerogels to the cassiterite structure observed during sintering was studied by means of Eu3+ spectroscopy, XRD and EXAFS at the Sn K-edge. Eu3+ ions adsorbed at the surface of colloidal particles present a broad distribution of sites, typical of oxide glasses. With sintering at 300°C, this distribution is still broadened. Crystallization is clearly observed by the three techniques with increasing sintering temperature. It is found that the addition of Eu3+ limits the crystallite growth.
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Eu3+ spectroscopy, EXAFS, Sintering, SnO2 xerogel, XRD, Adsorption, Composition effects, Crystal growth, Crystallization, Doping (additives), Europium, Particles (particulate matter), Spectroscopic analysis, Thermal effects, Tin compounds, X ray diffraction analysis, Extended X ray absorption fine structures (EXAFS), Xerogels, Gels
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Inglês
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Journal of Sol-Gel Science and Technology, v. 8, n. 1-3, p. 261-268, 1997.
