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首页> 外文期刊>Crystallography reports >Effect of the ultrasonic frequency on the multiple X-ray scattering from a LiNbO _3 crystal modulated by a surface acoustic wave
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Effect of the ultrasonic frequency on the multiple X-ray scattering from a LiNbO _3 crystal modulated by a surface acoustic wave

机译：超声频率对表面声波调制的LiNbO _3晶体多次X射线散射的影响

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摘要

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 _3 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 _3 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.
机译：在X射线动力学理论的框架下，研究了多次散射对表面声波（SAW）调制的晶体的θ-2θ扫描曲线形成的影响，具体取决于超声频率。衍射。分析了瑞利表面波的模型，该模型应用于X射线衍射，并考虑了横向和纵向弹性晶格应变。以LiNbO _3晶体的127°Y'切口为例，可以确定对于650 MHz以上的超声频率，可以忽略多次散射的影响。这一发现大大简化了由短波长声表面波调制的晶体的X射线衍射的数值计算。考虑到并忽略了多次散射的影响，已经对通过952 MHz SAW调制的LiNbO _3晶体的127°Y'切口的同步加速器散射进行了实验数据的比较定量分析。结果表明，计算时间可以减少2到3个数量级。

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