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- W1561016545 abstract "Phonon{phonon interactions were investigated in various nanocrystalline powders like anatase TiO2i‐, pure CeO2i‐ and ceria doped with Nd(Gd) analyzing temperature dependent Raman spectra of these systems. Phonon conflnement model based on size, inhomogeneous strain and anharmonic efiects 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 efiects have minor impact on Raman modes, four phonon anharmonic processes prevail under the three-phonon ones. When nanopowdered particles are grown enough size efiects provoke changes of the anharmonic interactions when three-phonon coupling prevails over the four-phonon anharmonic processes. In nanocrystalline anatase TiO2 evident blueshift of the most prominent Eg Raman mode probably originates from dominant four-phonon anharmonic interactions." @default.
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- W1561016545 date "2009-07-01" @default.
- W1561016545 modified "2023-10-18" @default.
- W1561016545 title "Anharmonicity Effects in Nanocrystals Studied by Raman Scattering Spectroscopy" @default.
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- W1561016545 doi "https://doi.org/10.12693/aphyspola.116.36" @default.
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