The Nanocrystalline SnO2-TiO2 System - Part I: Structural Features

Joice Miagava, Annick Rubbens, Pascal Roussel, Alexandra Navrotsky, Ricardo H.R. Castro, Douglas Gouvêa

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)631-637
Number of pages7
JournalJournal of the American Ceramic Society
Volume99
Issue number2
DOIs
StatePublished - Feb 1 2016
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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