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Issue 6, 2002
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Oxygen content analysis of functional perovskite-derived cobalt oxides

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We have evaluated the possible redox chemical methods for precisely determining the oxygen content in complex cobalt oxides that are being studied increasingly for their interesting electric and magnetic properties. For the evaluation, BaNdCo2O5 + δ and Sr2(Ca,Y)Co2O6 + δ phases are selected as reference materials to elucidate the capabilities of the different analysis methods. Two redox methods so far commonly applied, i.e. thermogravimetric H2 reduction and iodometric titration, are tested and two other, as yet unapplied, methods, i.e. cerimetric titration and Cu+/Cu2+ coulometric titration, are introduced for the analysis of functional cobalt oxides. The three different titration methods are found to reveal consistent values for the oxygen content with good reproducibility. The results of thermogravimetric H2 reduction analysis agree with the titration results but show a wider scattering. Of the four analytical methods, the Cu+/Cu2+ coulometric titration method is considered most recommendable, since it is precise and may, furthermore, be applied to e.g. Cu and Fe substituted cobalt oxide samples.

Graphical abstract: Oxygen content analysis of functional perovskite-derived cobalt oxides

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Publication details

The article was received on 21 Jan 2002, accepted on 08 Mar 2002 and first published on 04 Apr 2002

Article type: Paper
DOI: 10.1039/B200770N
J. Mater. Chem., 2002,12, 1761-1764

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    Oxygen content analysis of functional perovskite-derived cobalt oxides

    M. Karppinen, M. Matvejeff, K. Salomäki and H. Yamauchi, J. Mater. Chem., 2002, 12, 1761
    DOI: 10.1039/B200770N

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