Published in
Elsevier, Chemical Physics Letters, 1-3(444), p. 145-148
DOI: 10.1016/j.cplett.2007.06.135
Links
Tools
Phonon confinement effect in calcium fluoride nanoparticles
,
A. Casau,
Alberto Casu,
Giovanni De Giudici,
Giovanni B. De Giudici,
Paolo Scardi,
Alberto Anedda
Full text: Download
Abstract
Nanocrystalline CaF2 were obtained by ball-milled synthetic fluorite powders. Raman spectra of nanocrystals with average sizes of 10–25nm are reported and the correlation between the band shape of the only allowed Raman mode at 322cm−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.