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Preparation and characterization of Fully stoichiometric SrCoO 3 by electrochemical oxidation
Author(s) -
Bezdicka P.,
Wattiaux A.,
Grenier J. C.,
Pouchard M.,
Hagenmuller P.
Publication year - 1993
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19936190104
Subject(s) - brownmillerite , stoichiometry , electrochemistry , materials science , phase (matter) , partial pressure , perovskite (structure) , formula unit , magnetic moment , oxygen , analytical chemistry (journal) , inorganic chemistry , chemistry , crystallography , crystal structure , condensed matter physics , electrode , organic chemistry , physics , chromatography
A nearly stoichiometric SrCoO 3 phase had been prepared up to now only using high oxygen pressure. A new method for preparing fully stoichiometric SrCoO 3 has been proposed using electrochemical oxidation. Brownmillerite‐type SrCoO 2.50 is oxidized into a completely stoichiometric perovskite at a potential of 500 mV for 180 hours at room temperature in alkaline media (1 M KOH). The oxidized phase has a cubic unit cell (a=383.5 pm). It is metallic and, at temperatures below T=280 K, it shows ferromagnetic behavior. The magnetic moment at 0 K is 2.1 μ B . The physical properties of SrCoO 3.00 have been explained in terms of partial occupancy of a σ*e g αband.
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