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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Bragg-case limited projection topography study of surface damage in diamond-crystal plates
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Bragg-case limited projection topography study of surface damage in diamond-crystal plates

机译：布拉格案例有限投影形貌研究金刚石晶体板的表面损伤

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摘要

To characterize diamond monochromators for synchrotron radiation beamlines, images for a region 25 mu m below the surface were obtained. Topographical images of a Bragg-diffracted beam having a scattering angle (twice the Bragg angle) of 90 degrees were obtained from asymmetric reflections with a CCD area detector. A 25 mu m incident slit was used to section the sample topographically. Patchwork images for the full surface area, but limited in depth to the slit size, were assembled from microbeam images. The small extinction depths provided by the asymmetric reflection geometry, namely, 2.8 mu m and 3.5 mu m for ideal diamond crystals set for the (224) and (044) reflections, respectively, permitted data analyses for a region near the surface. The diamonds were synthetic type Ib (yellowish due to nitrogen impurities). They were in the shape of plates sized 6 x 5 mm and were 0.5 mm, thick. Measurements were made using monochromatic bending magnet radiation at the Advanced Photon Source at 12.04 keV and 13.90 keV. Data obtained before and after chemical etching demonstrate that damage visible as contrast from saw grooves is largely removed by etching. Dislocation etch pits were observed after etching for the (111) surface but not for the (100) surface.
机译：为了表征用于同步加速器辐射束线的金刚石单色仪，获得了表面以下25μm区域的图像。使用CCD区域检测器从非对称反射获得散射角（两倍于布拉格角）为90度的布拉格衍射光束的形貌图。使用25微米的入射狭缝对样品进行形貌剖分。从微束图像中收集了整个表面的拼布图像，但深度仅限于狭缝大小。由非对称反射几何结构提供的较小的消光深度，即分别为（224）和（044）反射设置的理想金刚石晶体的2.8μm和3.5μm，可以对靠近表面的区域进行数据分析。钻石是合成的Ib型（由于氮杂质而呈黄色）。它们为大小为6 x 5毫米的板状，厚度为0.5毫米。使用单色弯曲磁体辐射在高级光子源处以12.04 keV和13.90 keV进行测量。在化学蚀刻之前​​和之后获得的数据表明，通过锯切可以明显地消除作为锯齿槽对比度的可见损伤。在蚀刻之后，对于（111）表面而不是（100）表面观察到位错蚀刻坑。

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