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Investigation of the closed porosity of functional ceramic materials by spin-echo small-angle neutron scattering

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Abstract

The closed porous structure in ceramic materials is investigated by spin-echo small-angle neutron scattering. A series of ceramic samples of oxygen–ion conductors based on bismuth molybdate with the general formula Bi12.8 X 0.2Mo5O34 ± δ (X = Mg, Ba, Ca, Sr) is obtained by powder sintering for 6−45 h at a temperature close to the melting point. The samples are characterized by scanning electron microscopy and X-ray fluorescence analysis. It is found that they had a stoichiometric chemical composition, are singlephase, and contain clean pores between crystal grains. The pore size is determined by spin-echo small-angle neutron scattering and ranges from 2.2 to 3.5 μm. It is demonstrated that longer sintering times correspond to larger pores (the increase in their average diameter is as large as 30%). It is found that the studied materials lack a fractal pore structure.

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Authors and Affiliations

  1. Petersburg Nuclear Physics Institute, National Research Center “Kurchatov Institute,”, Gatchina, Leningrad oblast, 188300, Russia

    K. A. Pavlov, E. V. Velichko, V. N. Zabenkin & S. V. Grigoriev

  2. St. Petersburg State University, St. Petersburg, 190005, Russia

    K. A. Pavlov, E. V. Velichko & S. V. Grigoriev

  3. Delft University of Technology, 2600 AA, Delft, Netherlands

    W. H. Kraan, C. P. Duif & W. G. Bouwman

  4. Ural Federal University, Yekaterinburg, 620083, Russia

    Z. A. Mikhailovskaya & E. S. Buyanova

Authors
  1. K. A. Pavlov
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  2. E. V. Velichko
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  3. V. N. Zabenkin
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  4. W. H. Kraan
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  5. C. P. Duif
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  6. W. G. Bouwman
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  7. Z. A. Mikhailovskaya
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  8. E. S. Buyanova
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  9. S. V. Grigoriev
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Corresponding author

Correspondence to K. A. Pavlov.

Additional information

Original Russian Text © K.A. Pavlov, E.V. Velichko, V.N. Zabenkin, W.H. Kraan, C.P. Duif, W.G. Bouwman, Z.A. Mikhailovskaya, E.S. Buyanova, S.V. Grigoriev, 2017, published in Poverkhnost’, 2017, No. 1, pp. 47–54.

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Pavlov, K.A., Velichko, E.V., Zabenkin, V.N. et al. Investigation of the closed porosity of functional ceramic materials by spin-echo small-angle neutron scattering. J. Surf. Investig. 11, 92–98 (2017). https://doi.org/10.1134/S1027451017010189

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  • DOI: https://doi.org/10.1134/S1027451017010189

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