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Phase Equilibria and Structure of Solid Solutions in the La–Co–Fe–O System at 1100°C

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Phase equilibria in the La–Co–Fe–O system are studied at 1100°C in air using samples prepared by the citrate, nitrate, and conventional ceramic routes. The stability regions and structures of solid solutions in the La–Co–Fe–O system are determined by x-ray powder diffraction: LaCo1 – y Fe y O3 – δ (0 < y ≤ 0.25, sp. gr. R \({\bar 3}\) c; 0.775 ≤ y< 1, sp. gr. Pbnm), Co1 – y Fe y O (0 < y ≤ 0.13, NaCl-type structure, sp. gr. Fm3m), and Fe3 – x Co x O4 (0.84 ≤ x ≤ 1.38, sp. gr. Fd3m). The structural parameters of phase-pure solid solutions are determined by the Rietveld method. The composition dependences of lattice parameters are presented for LaCo1 – y Fe y O3 – δ (0 < y≤ 0.25) and Fe3 – x Co x O4 (0.84 ≤ x ≤ 1.38). The 1100°C isotherm of the pseudoternary system La2O3–CoO–Fe2O3 in air is constructed.

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Authors and Affiliations

  1. Ural State University, pr. Lenina 51, Yekaterinburg, 620083, Russia

    N. V. Proskurina, V. A. Cherepanov & O. S. Golynets

  2. Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 14, Yekaterinburg, 620219, Russia

    V. I. Voronin

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  1. N. V. Proskurina
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  2. V. A. Cherepanov
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  3. O. S. Golynets
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  4. V. I. Voronin
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Proskurina, N.V., Cherepanov, V.A., Golynets, O.S. et al. Phase Equilibria and Structure of Solid Solutions in the La–Co–Fe–O System at 1100°C. Inorganic Materials 40, 955–959 (2004). https://doi.org/10.1023/B:INMA.0000041328.85504.3d

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  • DOI: https://doi.org/10.1023/B:INMA.0000041328.85504.3d

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