A theoretical model for the Bragg X-ray diffraction from crystals modulated by surface acoustic waves (SAWs), is briefly described. The model includes the calculation of the lattice strain induced by a Rayleigh surface wave and the simulation of the wave fields in crystals, based on Takagi equations. The experimentally observed effect of the splitting of the peaks corresponding to different diffraction orders on rocking curves was considered using the example of X-ray diffraction from the YZ cut of a SAW-modulated LiNbO_3 crystal. The theory developed adequately describes this phenomenon and proves to be a powerful tool for solving various problems of X-ray diffractometry and topography of SAW-modulated crystals.
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