Papers

Peer-reviewed
May, 1998

New synthetic routes for preparing perovskites - Electrochemical oxidation and oxidation by NO2

SOLID STATE IONICS
  • JC Grenier
  • ,
  • JP Doumerc
  • ,
  • Y Muraoka
  • ,
  • S Petit
  • ,
  • M Pouchard
  • ,
  • A Wattiaux

Volume
108
Number
1-4
First page
9
Last page
15
Language
English
Publishing type
Research paper (scientific journal)
DOI
10.1016/S0167-2738(98)00012-5
Publisher
ELSEVIER SCIENCE BV

Two new synthetic low temperature routes for preparing perovskite-related materials, especially metastable phases are depicted. The first one, the electrochemical oxidation, uses the electric field as the driving force for intercalating oxygen atoms within parent oxide networks. The reaction is achieved under anodic potential, in alkaline solution (1 M KOH or NaOH), at room temperature, in air. This process has been used for preparing various perovskite compounds such as AMO(3) (A = Sr, La; M = Fe1-x Co-x) or A(2)MO(4+delta) (A = La, Nd, Sr). The most relevant results are reported. Potentiostatic and galvanostatic experiments have shown that the amount of intercalated oxygen can be controlled and that the process is reversible. Structural as well as electronic aspects of the oxygen intercalation are discussed and a reaction mechanism is proposed. The second route is based on the exothermic reaction of nitrogen dioxide NO2 with NH4+ ions at moderate temperatures (typically T < 300 degrees C), which allowed the destruction of NH4+ cations in situ. Topotactic reactions are described for preparing new hexagonal forms of WO3 or MoO3. The reaction process is discussed. (C) 1998 Elsevier Science B.V. All rights reserved.

Link information
DOI
https://doi.org/10.1016/S0167-2738(98)00012-5
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000073790600003&DestApp=WOS_CPL
ID information
  • DOI : 10.1016/S0167-2738(98)00012-5
  • ISSN : 0167-2738
  • Web of Science ID : WOS:000073790600003

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