Influence of CeO₂ nanocrystals size on the vacancies formation processes determined by spectroscopic techniques
In the paper influence of the size on the processes of oxygen vacancies formation in CeO₂ nanocrystals has been investigated. Changes in concentration of oxygen vacancies were determined by two independent indicators: intensity of 5d → 4f luminescence of Ce³⁺ ions and ratio between ⁵D₀ → ⁷F₁ and ⁵D₀...
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| Datum: | 2014 |
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| Hauptverfasser: | , , , |
| Format: | Artikel |
| Sprache: | English |
| Veröffentlicht: |
НТК «Інститут монокристалів» НАН України
2014
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| Schriftenreihe: | Functional Materials |
| Schlagworte: | |
| Online Zugang: | http://dspace.nbuv.gov.ua/handle/123456789/120460 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Influence of CeO₂ nanocrystals size on the vacancies formation processes determined by spectroscopic techniques / P.O. Maksimchuk, V.V. Seminko, I.I. Bespalova, A.A. Masalov // Functional Materials. — 2014. — Т. 21, № 3. — С. 254-259. — Бібліогр.: 13 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| Zusammenfassung: | In the paper influence of the size on the processes of oxygen vacancies formation in CeO₂ nanocrystals has been investigated. Changes in concentration of oxygen vacancies were determined by two independent indicators: intensity of 5d → 4f luminescence of Ce³⁺ ions and ratio between ⁵D₀ → ⁷F₁ and ⁵D₀ → ⁷F₂ luminescence bands of Eu³⁺ ions incorporated into ceria nanocrystals as structural probes. It was shown that for CeO₂ nanocrystals decrease of the size (from 75 nm to 20 nm) manifests itself in 1.5 times increase of the band intensity associated with vacancy-stabilized Ce³⁺ ions, while for CeO₂:Eu³⁺ nanocrystals it leads to lowering of symmetry for Eu³⁺ centre and correspondent decrease of ⁵D₀ → ⁷F₁/⁵D₀ → ⁷F₂ intensity ratio. It was shown that decrease of the size stimulates formation of the oxygen vacancies in ceria nanoparticles. |
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