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- Title
Effect of the ultrasonic frequency on the multiple X-ray scattering from a LiNbO crystal modulated by a surface acoustic wave.
- Authors
Punegov, V.; Roshchupkin, D.
- Abstract
The effect of multiple scattering on the formation of the θ-2θ scan curves for a crystal modulated by a surface acoustic wave (SAW), depending on the ultrasonic frequency, has been investigated in the frame-work of the dynamical theory of X-ray diffraction. A model of a Rayleigh surface wave has been analyzed as applied to X-ray diffraction with allowance for the transverse and longitudinal elastic lattice strains. Using the example of the 127° Y′ cut of the LiNbO crystal, it is established that the effects of multiple scattering can be neglected for ultrasonic frequencies above 650 MHz; this finding significantly simplifies the numerical calculations of X-ray diffraction from a crystal modulated by a short-wavelength SAW. A comparative quantitative analysis of the experimental data on synchrotron scattering from the 127° Y′ cut of a LiNbO crystal modulated by a 952-MHz SAW have been performed, both taking into account and neglecting the effects of multiple scattering. It is shown that the computation time can be reduced by 2 to 3 orders of magnitude.
- Subjects
ULTRASONICS; X-ray scattering; LITHIUM; CRYSTALS; WAVE functions; RAYLEIGH model; ACOUSTIC surface waves
- Publication
Crystallography Reports, 2012, Vol 57, Issue 1, p24
- ISSN
1063-7745
- Publication type
Article
- DOI
10.1134/S1063774511040213