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Title: Incorporation of chromium into TiO{sub 2} nanopowders

Highlights: • Nanopowders of TiO{sub 2}:Cr with different amount of Cr dopant were obtained by flame spray synthesis, FSS. • Increase in the optical absorption and a shift of the absorption edge were observed upon Cr doping. • HERFD-XANES measurements indicated that the average valence state of titanium ions was preserved. • Increasing magnetic susceptibility of a paramagnetic character was observed upon Cr doping. - Abstract: The paper reports on the results of a study of optical, electronic and magnetic properties of TiO{sub 2} nanopowders doped with Cr ions. Diffused reflectance spectra reveal an increase in the optical absorption and a shift of the absorption edge towards lower energies upon Cr doping. Direct information on the Ti electronic state and the symmetry of its nearest environment is obtained from XANES Ti K-edge spectra. Magnetic behaviour is probed by means of the temperature dependence of DC magnetic susceptibility. Increasing magnetic susceptibility of a paramagnetic character is observed upon increasing chromium doping. The Curie constant of TiO{sub 2}:10 at.% Cr sample (0.12 emu K/mol Oe) is lower than that expected for Cr{sup 3+} (0.1875 emu K/mol Oe) possibly due to the appearance of Cr{sup 4+} or the presence of the orbital contributionmore » to the magnetic moment.« less
Authors:
 [1] ;  [2] ;  [1] ;  [2] ;  [1] ;  [3] ;  [2] ;  [4] ; ;  [5]
  1. AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Department of Solid State Physics, Al. Mickiewicza 30, 30-059 Krakow (Poland)
  2. (Poland)
  3. Paul Scherrer Institute, Swiss Light Source, CH-5232 Villigen PSI (Switzerland)
  4. AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Department of Inorganic Chemistry, Al. Mickiewicza 30, 30-059 Krakow (Poland)
  5. AGH University of Science and Technology, Faculty of Computer Science, Electronics and Telecommunications, Department of Electronics, Al. Mickiewicza 30, 30-059 Krakow (Poland)
Publication Date:
OSTI Identifier:
22475722
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 64; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION; ABSORPTION SPECTROSCOPY; CHROMIUM ADDITIONS; DOPED MATERIALS; INORGANIC COMPOUNDS; MAGNETIC SUSCEPTIBILITY; NANOSTRUCTURES; OPTICAL PROPERTIES; PARAMAGNETISM; POWDERS; SPECTRA; SYMMETRY; SYNTHESIS; TEMPERATURE DEPENDENCE; TITANIUM OXIDES; X-RAY SPECTROSCOPY