Investigation of the closed porosity of functional ceramic materials by spin-echo small-angle neutron scattering
| Autor: | E. V. Velichko, S. V. Grigoriev, Z. A. Mikhailovskaya, V. N. Zabenkin, E. S. Buyanova, Wim G. Bouwman, Wicher H. Kraan, K. A. Pavlov, C. P. Duif |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Scanning electron microscope Analytical chemistry Sintering 02 engineering and technology Neutron scattering 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Small-angle neutron scattering 0104 chemical sciences Surfaces Coatings and Films Crystal Crystallography visual_art visual_art.visual_art_medium Melting point Ceramic 0210 nano-technology Porosity |
| Zdroj: | Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques. 11:92-98 |
| ISSN: | 1819-7094 1027-4510 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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