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2009 | 116 | 1 | 36-41
Article title

Anharmonicity Effects in Nanocrystals Studied by Raman Scattering Spectroscopy

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EN
Abstracts
EN
Phonon-phonon interactions were investigated in various nanocrystalline powders like anatase TiO_{2-δ}, pure CeO_{2-δ} and ceria doped with Nd(Gd) analyzing temperature dependent Raman spectra of these systems. Phonon confinement model based on size, inhomogeneous strain and anharmonic effects was used to properly describe the evident changes present in the Raman spectra of pure and doped ceria nanocrystalline samples. In small particles of pure and doped ceria nanocrystals, when size effects have minor impact on Raman modes, four phonon anharmonic processes prevail under the three-phonon ones. When nanopowdered particles are grown enough size effects provoke changes of the anharmonic interactions when three-phonon coupling prevails over the four-phonon anharmonic processes. In nanocrystalline anatase TiO_2 evident blueshift of the most prominent E_g Raman mode probably originates from dominant four-phonon anharmonic interactions.
Keywords
Year
Volume
116
Issue
1
Pages
36-41
Physical description
Dates
published
2009-07
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Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv116n106kz
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