Oxygen vacancy-induced microstructural changes of annealed CeO2-x nanocrystals
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Askrabic, S.Dohcevic-Mitrovic, Z.
Kremenović, Aleksandar S.

Lazarević, Nataša
Kahlenberg, V.
Popović, Zoran V.
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Nanocrystalline ceria (CeO2) is known for its ionic conductivity and oxygen storage properties, which depend on the presence of oxygen ion vacancies. The vacancies cause several important changes in CeO2 involving microstrain, electronic structure, magnetic properties, etc. In this article, we focus our attention to the microstructural changes of nanocrystalline CeO2-x annealed at different temperatures in the range 200500 degrees C. Structural and vibrational properties were investigated by X-ray diffraction and Raman spectroscopy. It was observed that the content of oxygen vacancies changed significantly with increasing annealing temperature, which plays an important role in the observed microstructural changes of the annealed samples. We demonstrate that the observed microstrain changes, because of variable defect content, dominate over the crystallite size effect. This finding is opposite to the conclusions made by several other authors. A new mode, classified as a probable surface... mode, was observed in the Raman spectra at similar to 480 cm(1), the appearance of which can be explained by the large defective structure and disorder in the ceria lattice. Copyright (c) 2011 John Wiley and Sons, Ltd.
Keywords:
nanocrystalline CeO2 / X-ray powder diffraction / Raman scattering / microstrain effects / surface modeSource:
Journal of Raman Spectroscopy, 2012, 43, 1, 76-81Funding / projects:
- Physics of nanostructured oxide materials and strongly correlated systems (RS-171032)
- Nanostructured multifunctional materials and nanocomposites (RS-45018)
- SASA [F-134], Swiss National Science Foundation [IZ73Z0-128169], CEEPUS [CII-AT-0038-06-1011]
DOI: 10.1002/jrs.2987
ISSN: 0377-0486
WoS: 000299631100012
Scopus: 2-s2.0-84856425913
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VinčaTY - JOUR AU - Askrabic, S. AU - Dohcevic-Mitrovic, Z. AU - Kremenović, Aleksandar S. AU - Lazarević, Nataša AU - Kahlenberg, V. AU - Popović, Zoran V. PY - 2012 UR - https://vinar.vin.bg.ac.rs/handle/123456789/4661 AB - Nanocrystalline ceria (CeO2) is known for its ionic conductivity and oxygen storage properties, which depend on the presence of oxygen ion vacancies. The vacancies cause several important changes in CeO2 involving microstrain, electronic structure, magnetic properties, etc. In this article, we focus our attention to the microstructural changes of nanocrystalline CeO2-x annealed at different temperatures in the range 200500 degrees C. Structural and vibrational properties were investigated by X-ray diffraction and Raman spectroscopy. It was observed that the content of oxygen vacancies changed significantly with increasing annealing temperature, which plays an important role in the observed microstructural changes of the annealed samples. We demonstrate that the observed microstrain changes, because of variable defect content, dominate over the crystallite size effect. This finding is opposite to the conclusions made by several other authors. A new mode, classified as a probable surface mode, was observed in the Raman spectra at similar to 480 cm(1), the appearance of which can be explained by the large defective structure and disorder in the ceria lattice. Copyright (c) 2011 John Wiley and Sons, Ltd. T2 - Journal of Raman Spectroscopy T1 - Oxygen vacancy-induced microstructural changes of annealed CeO2-x nanocrystals VL - 43 IS - 1 SP - 76 EP - 81 DO - 10.1002/jrs.2987 ER -
@article{ author = "Askrabic, S. and Dohcevic-Mitrovic, Z. and Kremenović, Aleksandar S. and Lazarević, Nataša and Kahlenberg, V. and Popović, Zoran V.", year = "2012", abstract = "Nanocrystalline ceria (CeO2) is known for its ionic conductivity and oxygen storage properties, which depend on the presence of oxygen ion vacancies. The vacancies cause several important changes in CeO2 involving microstrain, electronic structure, magnetic properties, etc. In this article, we focus our attention to the microstructural changes of nanocrystalline CeO2-x annealed at different temperatures in the range 200500 degrees C. Structural and vibrational properties were investigated by X-ray diffraction and Raman spectroscopy. It was observed that the content of oxygen vacancies changed significantly with increasing annealing temperature, which plays an important role in the observed microstructural changes of the annealed samples. We demonstrate that the observed microstrain changes, because of variable defect content, dominate over the crystallite size effect. This finding is opposite to the conclusions made by several other authors. A new mode, classified as a probable surface mode, was observed in the Raman spectra at similar to 480 cm(1), the appearance of which can be explained by the large defective structure and disorder in the ceria lattice. Copyright (c) 2011 John Wiley and Sons, Ltd.", journal = "Journal of Raman Spectroscopy", title = "Oxygen vacancy-induced microstructural changes of annealed CeO2-x nanocrystals", volume = "43", number = "1", pages = "76-81", doi = "10.1002/jrs.2987" }
Askrabic, S., Dohcevic-Mitrovic, Z., Kremenović, A. S., Lazarević, N., Kahlenberg, V.,& Popović, Z. V.. (2012). Oxygen vacancy-induced microstructural changes of annealed CeO2-x nanocrystals. in Journal of Raman Spectroscopy, 43(1), 76-81. https://doi.org/10.1002/jrs.2987
Askrabic S, Dohcevic-Mitrovic Z, Kremenović AS, Lazarević N, Kahlenberg V, Popović ZV. Oxygen vacancy-induced microstructural changes of annealed CeO2-x nanocrystals. in Journal of Raman Spectroscopy. 2012;43(1):76-81. doi:10.1002/jrs.2987 .
Askrabic, S., Dohcevic-Mitrovic, Z., Kremenović, Aleksandar S., Lazarević, Nataša, Kahlenberg, V., Popović, Zoran V., "Oxygen vacancy-induced microstructural changes of annealed CeO2-x nanocrystals" in Journal of Raman Spectroscopy, 43, no. 1 (2012):76-81, https://doi.org/10.1002/jrs.2987 . .