Anharmonicity Effects in Nanocrystals Studied by Raman Scattering Spectroscopy

• Authors: Z. Dohčević-Mitrović , Z. Popović , M. Šćepanović
• Languages of publication: 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

EN

63.22.-m; 78.67.Bf; 78.30.-j; 61.72.uj

Discipline

• 61.72.uj: III-V and II-VI semiconductors
• 78.67.Bf: Nanocrystals, nanoparticles, and nanoclusters
• 63.22.-m: Phonons or vibrational states in low-dimensional structures and nanoscale materials
• 78.30.-j: Infrared and Raman spectra(for vibrational states in crystals and disordered systems, see 63.20.-e and 63.50.-x, respectively; for Raman spectra of superconductors, see 74.25.nd)

• Journal: Acta Physica Polonica A
• Year: 2009
• Volume: 116
• Issue: 1
• Pages: 36-41

Dates

published

2009-07

Contributors

author

Z. Dohčević-Mitrović

• Center for Solid State Physics and New Materials, Institute of Physics, Belgrade, Serbia

author

Z. Popović

• Center for Solid State Physics and New Materials, Institute of Physics, Belgrade, Serbia

author

M. Šćepanović

• Center for Solid State Physics and New Materials, Institute of Physics, Belgrade, Serbia

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Identifiers

DOI

10.12693/APhysPolA.116.36