Mechanochemical Synthesis, Structure, and Properties of Nanocrystalline Metastable Perovskites and Fluorites for Catalytic Membrane Reactors
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Translated
|
| Conference |
10th Seminar on Nanoscience and Technology Materials
02-06 Jun 2003
,
Novosibirsk
|
| Journal |
Journal of Structural Chemistry
ISSN: 0022-4766
, E-ISSN: 1573-8779
|
| Output data |
Year: 2004,
Volume: 45,
Pages: S127-S132
Pages count
: 1
DOI:
10.1007/s10947-006-0107-0
|
| Authors |
Zyryanov V.V.
1
,
Uvarov N.F.
1
,
Sadykov V.A.
2
,
Alikina G.M.
2
,
Ivashkevich L.S.
3
,
Ivanovskaya M.I.
3
,
Neophytides S.
4
|
| Affiliations |
| 1 |
Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk
|
| 2 |
G. K. Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk
|
| 3 |
Scientific Research Institute of Physicochemical Problems, Belarus State University, Minsk
|
| 4 |
Institute of Chemical Equipment and High-Temperature Processes, Patras, Greece
|
|
Funding (1)
|
1
|
International Association for the Promotion of Co-operation with Scientists from the New Independent States of the Former Soviet Union
|
02-2162
|
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.