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Crystal Structure and Oxygen Nonstoichiometry of Ba0.9Ln0.1Fe1 – yCoyO3 – δ (Ln = Nd, Sm, Eu) Solid Solutions

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Abstract

Samples of general formula Ba0.9Ln0.1Fe1 – yCoyO3 – δ (Ln = Nd, Sm, Eu; y = 0.1–0.9) were studied at 1100°С under air. X-ray powder diffraction data for samples prepared by glycerol–nitrate technology were used to determine the homogeneity range of Ba0.9Ln0.1Fe1 – yCoyO3 – δ solid solutions (ss): 0.1 ≤ y ≤ 0.7 for Ln = Nd, 0.1 ≤ y ≤ 0.5 for Ln = Sm, and 0.1 ≤ y ≤ 0.4 for Ln = Eu. The crystal structure of single-phase oxides was described in terms of a cubic unit cell (space group \(Pm\bar {3}m\)). The increasing cobalt content or rare-earth atomic radius brings about an increase in Ba0.9Ln0.1Fe1 – yCoyO3 – δ unit cell parameter. The oxygen content (3 – δ) in the temperature range 25–1100°C under air was determined by thermogravimetry and iodometric titration. Oxygen exchange between the solid oxide and gas phase starts at ~350°С. The oxygen content and mean oxidation state of the 3d metal in Ba0.9Ln0.1Fe1 – yCoyO3 – δ both decrease as the cobalt concentration increases or the lanthanide atomic number increases.

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Funding

The work was fulfilled as part of the assignment of the Ministry of Science and Higher Education of the Russian Federation (No. AAAA-A20-120061990010-7).

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Authors and Affiliations

  1. Institute of Natural Sciences and Mathematics, Ural Federal University, 620002, Yekaterinburg, Russia

    I. B. Golovachev, A. A. Trushnikov, N. E. Volkova, T. V. Aksenova & V. A. Cherepanov

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  1. I. B. Golovachev
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  2. A. A. Trushnikov
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  3. N. E. Volkova
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  4. T. V. Aksenova
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  5. V. A. Cherepanov
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Correspondence to N. E. Volkova.

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Translated by O. Fedorova

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Golovachev, I.B., Trushnikov, A.A., Volkova, N.E. et al. Crystal Structure and Oxygen Nonstoichiometry of Ba0.9Ln0.1Fe1 – yCoyO3 – δ (Ln = Nd, Sm, Eu) Solid Solutions. Russ. J. Inorg. Chem. 67, 761–766 (2022). https://doi.org/10.1134/S0036023622060092

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