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11) twin boundaries of Y-cut synthetically grown quartz crystals are studied by means of X-ray section topographs. The images show an anomalous contrast and no extinction condition can be found. Simulated images demonstrate that the twin boundaries are not simple planar defects. They may be described as lamellae of a non-diffracting material. Their thickness is of the order of 15 μm and, within these boundaries, the Fourier components of the dielectric susceptibility are drastically reduced by one order of magnitude.
11) twin boundaries of Y-cut synthetically grown quartz crystals are studied by means of X-ray section topographs. The images show an anomalous contrast and no extinction condition can be found. Simulated images demonstrate that the twin boundaries are not simple planar defects. They may be described as lamellae of a non-diffracting material. Their thickness is of the order of 15 μm and, within these boundaries, the Fourier components of the dielectric susceptibility are drastically reduced by one order of magnitude.
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