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


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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 Bi12.8X0.2Mo5O34 ± 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.

Sobre autores

K. Pavlov

Petersburg Nuclear Physics Institute; St. Petersburg State University

Autor responsável pela correspondência
Email: orbita.pk@lns.pnpi.spb.ru
Rússia, Gatchina, Leningrad oblast, 188300; St. Petersburg, 190005

E. Velichko

Petersburg Nuclear Physics Institute; St. Petersburg State University

Email: orbita.pk@lns.pnpi.spb.ru
Rússia, Gatchina, Leningrad oblast, 188300; St. Petersburg, 190005

V. Zabenkin

Petersburg Nuclear Physics Institute

Email: orbita.pk@lns.pnpi.spb.ru
Rússia, Gatchina, Leningrad oblast, 188300

W. Kraan

Delft University of Technology

Email: orbita.pk@lns.pnpi.spb.ru
Países Baixos, Delft, 2600 AA

C. Duif

Delft University of Technology

Email: orbita.pk@lns.pnpi.spb.ru
Países Baixos, Delft, 2600 AA

W. Bouwman

Delft University of Technology

Email: orbita.pk@lns.pnpi.spb.ru
Países Baixos, Delft, 2600 AA

Z. Mikhailovskaya

Ural Federal University

Email: orbita.pk@lns.pnpi.spb.ru
Rússia, Yekaterinburg, 620083

E. Buyanova

Ural Federal University

Email: orbita.pk@lns.pnpi.spb.ru
Rússia, Yekaterinburg, 620083

S. Grigoriev

Petersburg Nuclear Physics Institute; St. Petersburg State University

Email: orbita.pk@lns.pnpi.spb.ru
Rússia, Gatchina, Leningrad oblast, 188300; St. Petersburg, 190005

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