Nanocrystalline CaF2 were obtained by ball-milled synthetic fluorite powders. Raman spectra of nanocrystals with average sizes of 10-25 nm are reported and the correlation between the band shape of the only allowed Raman mode at 322 cm-1 and the crystals dimensions is discussed. While in such systems local temperature and pressure effects play a minor role, variations in the shape of the Raman band can be correctly reproduced by a model based on the phonon confinement that effectively takes into account the anisotropy of the phonon dispersion curve.
Phonon confinement effect in calcium fluoride nanoparticles / P.C. Ricci, A. Casu, G.D. Giudici, P. Scardi, A. Anedda. - In: CHEMICAL PHYSICS LETTERS. - ISSN 0009-2614. - 444:1-3(2007 Aug 17), pp. 145-148. [10.1016/j.cplett.2007.06.135]
Phonon confinement effect in calcium fluoride nanoparticles
A. CasuSecondo
;
2007
Abstract
Nanocrystalline CaF2 were obtained by ball-milled synthetic fluorite powders. Raman spectra of nanocrystals with average sizes of 10-25 nm are reported and the correlation between the band shape of the only allowed Raman mode at 322 cm-1 and the crystals dimensions is discussed. While in such systems local temperature and pressure effects play a minor role, variations in the shape of the Raman band can be correctly reproduced by a model based on the phonon confinement that effectively takes into account the anisotropy of the phonon dispersion curve.
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