Abstract
An x-ray-diffraction technique developed for the direct observation of defects in crystalline material has been used to study standing acoustic waves in rectangular and circular AT quartz plates [W. J. Spencer, Appl. Phys. Letters 2, 133 (1963)]. The lattice curvature associated with the elastic standing wave in the crystalline lattice produces an enhancement in the intensity of the diffracted x-rays. The transverse waves near the fundamental thickness shear mode of rectangular AT quartz plates have been observed as one dimension of the plate is reduced. The results generally correspond with the empirical results obtained earlier, with the exception of the anharmonic thickness shear modes. The phase reversals of these modes occur along the z′ axis rather than along the x axis, as had been previously assumed.
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