The Nanocrystalline SnO 2 -TiO 2 System-Part I: Structural Features

Autor: Ricardo H. R. Castro, Pascal Roussel, Joice Miagava, Annick Rubbens, Douglas Gouvêa, Alexandra Navrotsky
Přispěvatelé: Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, Thermochemistry laboratory (NEAT ORU), University of California [Davis] (UC Davis), University of California-University of California, Departamento de Engenharia Electrotécnica e de Computadores [Porto] (DEEC), Universidade do Porto, Department of Metallurgical and Materials Engineering, Universidade de São Paulo (USP)-Escola Politécnica, Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, Universidade do Porto = University of Porto, Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), University of California (UC)-University of California (UC), Universidade de São Paulo = University of São Paulo (USP)-Escola Politécnica
Jazyk: angličtina
Rok vydání: 2016
Předmět:
Zdroj: Journal of the American Ceramic Society
Journal of the American Ceramic Society, Wiley, 2016, 99 (2), pp.631-637. ⟨10.1111/jace.13790⟩
Journal of the American Ceramic Society, 2016, 99 (2), pp.631-637. ⟨10.1111/jace.13790⟩
ISSN: 0002-7820
1551-2916
DOI: 10.1111/jace.13790⟩
Popis: The phases present and their crystal structure and microstructure in the nanocrystalline SnO2–TiO2 system were studied in the compositional range Sn1−xTixO2 (0.0 ≤ x ≤ 0.9). There is an apparent increase in the solubility limits in the solid solution compared to bulk crystalline SnO2–TiO2. No two phase region was observed with increasing TiO2 content. Electron energy loss spectroscopy, infrared spectroscopy (FTIR), and X-ray diffraction (XRD) of the nanopowders showed that the apparent increase in solubility is related to the systematic Ti4+ segregation on the particle surface (surface excess) at the SnO2-rich side, avoiding the nucleation of a second phase even at high Ti4+ contents. Is this finding in accord with Raman spectra, which suggest localized Ti-rich sites in the absence of a second crystalline phase. Ti4+ surface excess is also lead to a modification of the surface hydroxyls and a decrease in the crystallite size of the nanoparticles (with a concomitant increase in surface area), with expected implications to catalytic and sensorial properties of these nanoparticles.
Databáze: OpenAIRE
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