TY - JOUR
T1 - The Nanocrystalline SnO2-TiO2 System - Part I
T2 - Structural Features
AU - Miagava, Joice
AU - Rubbens, Annick
AU - Roussel, Pascal
AU - Navrotsky, Alexandra
AU - Castro, Ricardo H.R.
AU - Gouvêa, Douglas
N1 - Funding Information:
RHRC thanks National Science Foundation, DMR 1055504, for financial support. DG and JM thank CNPq (202226/2011-5) and CAPES for financial support. U.S. Dept. of Energy, Office of Basic Energy Sciences (grant DE-FG02-03ER46053) is also acknowledged.
Publisher Copyright:
© 2015 The American Ceramic Society.
PY - 2016/2/1
Y1 - 2016/2/1
N2 - 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.
AB - 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.
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U2 - 10.1111/jace.13790
DO - 10.1111/jace.13790
M3 - Article
AN - SCOPUS:84950253992
SN - 0002-7820
VL - 99
SP - 631
EP - 637
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 2
ER -