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

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

Research output: Contribution to journalArticleScientificpeer-review

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.

Original languageEnglish
Pages (from-to)92-98
Number of pages7
JournalJournal of Surface Investigation: X-Ray, Synchrotron and Neutron Techniques
Volume11
Issue number1
DOIs
Publication statusPublished - 1 Jan 2017

Keywords

  • bismuth molybdate
  • oxygen conductors
  • scanning electron microscopy
  • spin-echo small-angle neutron scattering
  • X-ray fluorescence analysis

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