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Proceedings Paper

Dimension effect in lattice absorption of silicon carbide
Author(s): I. A. Sokolov; S. V. Ordin
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Paper Abstract

We report high-sensitive experimental investigations of the SiC powders transmission spectra in the lattice oscillations region. For the SiC powders with the grain size of the order of the wave length the transmission minimum is shifted to the low-frequency range with respect to the transverse oscillation frequency of a single crystal ωT orresponding to phonon absorption with greater wave vectors. The decrease of the grain size leads to the shift and narrowing of the lattice absorption band to the high-frequency region. The observed change in the form and position of an absorption band corresponds to the narrowing of an optical phonon band due to decrease of the crystalline grain size, and approaching the lattice oscillation frequency to the frequency of molecular oscillations of Si-C in carbosilane owing to the surface energy contribution increase.

Paper Details

Date Published: 9 December 2005
PDF: 5 pages
Proc. SPIE 6024, ICO20: Optical Devices and Instruments, 602429 (9 December 2005); doi: 10.1117/12.666955
Show Author Affiliations
I. A. Sokolov, A.F. Ioffe Physico-Technical Institute (Russia)
S. V. Ordin, A.F. Ioffe Physico-Technical Institute (Russia)

Published in SPIE Proceedings Vol. 6024:
ICO20: Optical Devices and Instruments
James C. Wyant; X. J. Zhang, Editor(s)

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