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Structural phase transitions in YBaCo4O7 + x cobaltate upon variations in oxygen content, according to X-ray diffraction data obtained using synchrotron radiation

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Bulletin of the Russian Academy of Sciences: Physics Aims and scope

Abstract

According to thermogravimetric data, the equilibrium oxygen content in layered YBaCo4O7 + x cobaltate varies stepwise from x ≈ 1.4 to x ≈ 0 when temperature is varied in the range of 300–400°C. Detailed ex situ and in situ structural investigations using synchrotron radiation show that variation in the oxygen content in YBaCo4O7 + x is accompanied by substantial reordering of the crystal structure and has the character of a first-order phase transition between two rigorously determined phases that differ by the parameters and symmetry of the crystal lattice as well as by the oxygen content. In addition to uniquely high oxygen liberation upon heating, dx/dT, great mechanical stresses that lead to the material cracking and complicate its practical use are a consequence of the character of stepwise transitions in YBaCo4O7 + x .

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Authors and Affiliations

  1. Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia

    A. V. Alekseev, M. Yu. Kameneva, L. P. Kozeeva, A. N. Lavrov, N. V. Podberezskaya & A. I. Smolentsev

  2. Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090, Russia

    A. N. Shmakov

Authors
  1. A. V. Alekseev
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  2. M. Yu. Kameneva
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  3. L. P. Kozeeva
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  4. A. N. Lavrov
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  5. N. V. Podberezskaya
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  6. A. I. Smolentsev
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  7. A. N. Shmakov
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Corresponding author

Correspondence to M. Yu. Kameneva.

Additional information

Original Russian Text © A.V. Alekseev, M.Yu. Kameneva, L.P. Kozeeva, A.N. Lavrov, N.V. Podberezskaya, A.I. Smolentsev, A.N. Shmakov, 2013, published in Izvestiya Rossiiskoi Akademii Nauk. Seriya Fizicheskaya, 2013, Vol. 77, No. 2, pp. 173–176.

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Alekseev, A.V., Kameneva, M.Y., Kozeeva, L.P. et al. Structural phase transitions in YBaCo4O7 + x cobaltate upon variations in oxygen content, according to X-ray diffraction data obtained using synchrotron radiation. Bull. Russ. Acad. Sci. Phys. 77, 151–154 (2013). https://doi.org/10.3103/S1062873813020044

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  • DOI: https://doi.org/10.3103/S1062873813020044

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