Preparation and characterization of Fully stoichiometric SrCoO<sub>3</sub> by electrochemical oxidation

P. Bezdicka, A. Wattiaux, J. C. Grenier, M. Pouchard, P. Hagenmuller

doi:10.1002/zaac.19936190104

Preparation and characterization of Fully stoichiometric SrCoO<sub>3</sub> by electrochemical oxidation

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<jats:title>Abstract</jats:title><jats:p>A nearly stoichiometric SrCoO<jats:sub>3</jats:sub> phase had been prepared up to now only using high oxygen pressure. A new method for preparing fully stoichiometric SrCoO<jats:sub>3</jats:sub> has been proposed using electrochemical oxidation. Brownmillerite‐type SrCoO<jats:sub>2.50</jats:sub> 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<jats:sub>B</jats:sub>. The physical properties of SrCoO<jats:sub>3.00</jats:sub> have been explained in terms of partial occupancy of a σ*e<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/tex2gif-stack-1.gif" xlink:title="urn:x-wiley:00442313:media:ZAAC19936190104:tex2gif-stack-1" /> band.</jats:p>