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Evaluation of manganese and oxygen content in La0.7Sr0.3MnO3−δ and correlation with the thermodynamic data

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Abstract

In order to understand how the thermodynamic properties are related to the oxygen and manganese content in the Sr-doped lanthanum manganites, nonstoichiometric perovskite phases La0.7Sr0.3MnO3−δ have been investigated by using solid state electrochemical techniques, as well as wet chemical methods. The influence of the oxygen stoichiometry change on the thermodynamic properties was examined using the data obtained by a coulometric titration technique coupled with solid state electromotive force measurements (EMF). The results were correlated with the average Mn valence values as determined by a chemical method based on two independent iodometric titrations, with amperometric dead-stop end point detection. New features related to the relationship between the average Mn valence, the oxygen nonstoichiometry variation, and the thermodynamic behavior were evidenced.

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Acknowledgment

We wish to thank Risø National Laboratory-Denmark for supplying the solid electrolyte used in EMF measurements for thermodynamic investigations.

This paper has been prepared in the frame of the PN–II–ID–PCE Project no. 50/2007 under financial support from the Romanian Ministry of Research and Education (ANCS).

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Authors and Affiliations

  1. Institute of Physical Chemistry “Ilie Murgulescu”, Splaiul Independentei 202, 060021, Bucharest, Romania

    Speranta Tanasescu, Cornelia Marinescu, Florentina Maxim, Ancuta Sofronia & Nicolae Totir

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  1. Speranta Tanasescu
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  2. Cornelia Marinescu
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  3. Florentina Maxim
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  4. Ancuta Sofronia
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  5. Nicolae Totir
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Correspondence to Speranta Tanasescu.

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Tanasescu, S., Marinescu, C., Maxim, F. et al. Evaluation of manganese and oxygen content in La0.7Sr0.3MnO3−δ and correlation with the thermodynamic data. J Solid State Electrochem 15, 189–196 (2011). https://doi.org/10.1007/s10008-010-1093-x

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  • DOI: https://doi.org/10.1007/s10008-010-1093-x

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