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Orthorhombic YBaCo4O8.4 crystals as a result of saturation of hexagonal YBaCo4O7 crystals with oxygen

  • Structure of Inorganic Compounds
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Abstract

Hexagonal YBaCo4O7 crystals (sp. gr. P63 mc, a h = 6.3058(4) Å, c h = 10.2442(7) Å, Z = 2) are saturated with oxygen to the YBaCo4O8.4 composition and studied by X-ray diffraction (XRD) analysis. The saturation is completed by a structural first-order phase transition to orthorhombic crystals (sp. gr. Pbc21, a o = 31.8419(2) Å, b o = 10.9239(5) Å, c o = 10.0960(5) Å, Z = 20). The connection of two lattices is expressed in terms of the action of matrix (500/120/001) on the hexagonal basis. Five structural fragments of the same type but with different degrees of order alternate along the long axis of the oxygen-saturated orthorhombic structure. The XRD data on single crystals differ from the results obtained by other researchers on ceramic samples; possible causes of these differences are discussed.

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Authors and Affiliations

  1. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, pr. Akademika Lavrent’eva 3, 630090, Russia

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

  2. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333, Russia

    N. B. Bolotina

  3. Novosibirsk National Research State University, ul. Pirogova 2, Novosibirsk, 630090, Russia

    V. Yu. Komarov

Authors
  1. N. V. Podberezskaya
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  2. N. B. Bolotina
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  3. V. Yu. Komarov
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  4. M. Yu. Kameneva
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  5. L. P. Kozeeva
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  6. A. N. Lavrov
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  7. A. I. Smolentsev
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Corresponding authors

Correspondence to N. V. Podberezskaya, N. B. Bolotina or V. Yu. Komarov.

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Original Russian Text © N.V. Podberezskaya, N.B. Bolotina, V.Yu. Komarov, M.Yu. Kameneva, L.P. Kozeeva, A.N. Lavrov, A.I. Smolentsev, 2015, published in Kristallografiya, 2015, Vol. 60, No. 4, pp. 538–546.

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Podberezskaya, N.V., Bolotina, N.B., Komarov, V.Y. et al. Orthorhombic YBaCo4O8.4 crystals as a result of saturation of hexagonal YBaCo4O7 crystals with oxygen. Crystallogr. Rep. 60, 484–492 (2015). https://doi.org/10.1134/S1063774515040161

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  • DOI: https://doi.org/10.1134/S1063774515040161

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