Cation disorder in Sr0.67Ba0.33Nb2O6 assessed by aberration corrected stem
| Autor: | José M. González-Calbet, Alicia Ruiz-Caridad, Almudena Torres-Pardo, Guilhem Dezanneau, M. L. Ruiz-González, Sònia Estradé, Francesca Peiró, J. M. Rebled, L. López-Conesa |
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| Rok vydání: | 2019 |
| Předmět: |
EELS
Electron energy loss spectroscopy General Engineering Relaxors Energy Engineering and Power Technology Microstructure Molecular physics Electric charge SAED Crystal Annular dark-field imaging Electron diffraction TEM lcsh:TA401-492 lcsh:Materials of engineering and construction. Mechanics of materials Single crystal Superstructure (condensed matter) |
| Zdroj: | Results in Materials, Vol 3, Iss, Pp 100038-(2019) |
| ISSN: | 2590-048X |
| DOI: | 10.1016/j.rinma.2019.100038 |
| Popis: | The microstructure and composition of a single crystal of the relaxor Sr0.67Ba0.33Nb2O6 have been assessed by aberration corrected TEM. Electron diffraction showed the presence of diffuse intensity and superstructure incommensurate reflections, compatible with Sr vacancies and Sr/Ba mixing at specific crystal sites respectively. Atomic resolution high angle annular dark field imaging confirmed the presence of these cation vacancies and electron energy loss spectroscopy demonstrated the random mixing of Ba and Sr. Unveiling structure and chemistry with this unprecedent spatial resolution gives the necessary understanding of the electric charge disorder at the origin of polar nanodomains, ultimately leading to relaxor behaviour. |
| Databáze: | OpenAIRE |
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