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

Journal article (2017)

Authors

K. A. Pavlov Petersburg Nuclear Physics Institute (PNPI), St. Petersburg State University
E.V. Velichko Petersburg Nuclear Physics Institute (PNPI), St. Petersburg State University
V.N. Zabenkin Petersburg Nuclear Physics Institute (PNPI)
W.H. Kraan RST/Neutron and Positron Methods in Materials - AS
C.P. Duif RST/Neutron and Positron Methods in Materials - AS
W.G. Bouwman RST/Neutron and Positron Methods in Materials - AS
Z. A. Mikhailovskaya Ural Federal University
E. S. Buyanova Ural Federal University
S. V. Grigoriev St. Petersburg State University, Petersburg Nuclear Physics Institute (PNPI)
Research Group
RST/Neutron and Positron Methods in Materials (AS) (TU Delft)
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Published Date

01-01-2017

Language

English

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Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Neutron and Positron Methods in Materials

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 Bi12.8X0.2Mo5O34 ± 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.

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