Journal of Structural Chemistry

, Volume 45, Supplement 1, pp S127–S132

Mechanochemical synthesis, structure, and properties of nanocrystalline metastable perovskites and fluorites for catalytic membrane reactors

  • V. V. Zyryanov
  • N. F. Uvarov
  • V. A. Sadykov
  • G. M. Alikina
  • L. S. Ivashkevich
  • M. I. Ivanovskaya
  • S. Neophytides
Article

DOI: 10.1007/s10947-006-0107-0

Cite this article as:
Zyryanov, V.V., Uvarov, N.F., Sadykov, V.A. et al. J Struct Chem (2004) 45(Suppl 1): S127. doi:10.1007/s10947-006-0107-0

Abstract

Nanosized powders of conductive complex fluorites based on δ-Bi2O3 and perovskites based on LnMnO3, SrFeO3, LnGaO3 have been obtained by mechanochemical synthesis. Complex doping was used for kinetic stabilization of the metastable phases, which provides dense ceramics prepared by the standard sintering procedure. Some perovskites and especially fluorites with a large cell parameter are rhombohedrally distorted during sintering, and their conductivity decreases. Complex fluorites with sintering temperatures optimal for composite membranes and with ion conductivity as high as that of the known conductor Ce0.8Gd0.2O2-δ have been obtained. There are chemically compatible systems that can give composites with mixed conductivity — potential materials for catalytic membrane reactors — prepared from nanopowders. Criteria for selecting oxide conductors for composites are formulated: appropriate sintering temperature, chemical compatibility, and high conductivity.

Keywords

fluorite perovskite mechanochemical synthesis metastable phase nanopowders mixed conductivity composites compatibility catalytic membrane reactor (CMR) 

Copyright information

© Springer Science+Business Media, Inc. 2004

Authors and Affiliations

  • V. V. Zyryanov
    • 1
  • N. F. Uvarov
    • 1
  • V. A. Sadykov
    • 2
  • G. M. Alikina
    • 2
  • L. S. Ivashkevich
    • 3
  • M. I. Ivanovskaya
    • 3
  • S. Neophytides
    • 4
  1. 1.Institute of Solid State Chemistry and Mechanochemistry, Siberian BranchRussian Academy of SciencesNovosibirsk
  2. 2.G. K. Boreskov Institute of Catalysis, Siberian BranchRussian Academy of SciencesNovosibirsk
  3. 3.Scientific Research Institute of Physicochemical ProblemsBelarus State UniversityMinsk
  4. 4.Institute of Chemical Equipment and High-Temperature ProcessesPatrasGreece

Personalised recommendations