Dimension effect in lattice absorption of silicon carbide

I. A. Sokolov; S. V. Ordin

doi:10.1117/12.666955

9 December 2005 Dimension effect in lattice absorption of silicon carbide

I. A. Sokolov, S. V. Ordin

Proceedings Volume 6024, ICO20: Optical Devices and Instruments; 602429 (2005) https://doi.org/10.1117/12.666955
Event: ICO20:Optical Devices and Instruments, 2005, Changchun, China

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 ω_T 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.

Citation Download Citation

I. A. Sokolov and S. V. Ordin "Dimension effect in lattice absorption of silicon carbide", Proc. SPIE 6024, ICO20: Optical Devices and Instruments, 602429 (9 December 2005); https://doi.org/10.1117/12.666955

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