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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >DOUBLE-CRYSTAL DIFFRACTOMETRIC AND TOPOGRAPHIC STUDIES OF (111) ORIENTED SYNTHETIC DIAMONDS
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DOUBLE-CRYSTAL DIFFRACTOMETRIC AND TOPOGRAPHIC STUDIES OF (111) ORIENTED SYNTHETIC DIAMONDS

机译：（111）定向合成钻石的双衍射和层析成像研究

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Synchrotron x-radiation in a double-crystal geometry has been used for topography and rocking-curve measurements to study imperfections in single-crystal HP/HT synthetic diamonds grown from (111) seeds by the reconstitution technique. The influence that clusters of small (1-5 mu m) opaque particles (sometimes called 'pin-point-like inclusions') have upon lattice parameter differences, as well as upon relative lattice tilts within each sample, was of particular interest in this study. Rocking curves measured with a large beam diameter (illuminating entire specimens) gave widths (FWHM) in the range 5-30 seconds of are in a non-dispersive Bragg-Bragg diffraction geometry in which good diamond crystals give 3 '' and for which the calculated theoretical minimum width is under 1 ''. Rocking curves were also recorded for small regions of each crystal, using a translatable pin-hole, and these showed that some diamonds had relatively narrow rocking curves in selected areas (of 100 mu m diameter). Epochs of crystal growth were recorded in series of x-ray topographs, taken at intervals of 2.5 seconds of are. Such series were taken for all four principal azimuths (chi = 0, 90, 180 and 270 degrees) of the incident beam by rotating the sample about the normal to the Bragg plane. This procedure yielded important information about lattice parameter distribution and lattice tilt across entire samples. For the samples heavily populated with pin-point-like inclusions it was concluded that there is a possible slight variation in lattice parameter values in some regions of the crystal but most of it falls below the adopted angular step resolution, although better accuracy can be achieved. Relative tilt measurements revealed that there are large misorientations of those parts of the crystal which are close to external outcrops of {111} boundaries. In this case of (111) oriented diamond samples, three separate regions with different tilts can be attributed to the three parts of the crystal close to optically visible {111} growth-sector boundaries. [References: 15]
机译：双晶体几何结构的同步辐射X射线已用于形貌和摇摆曲线测量，以研究通过重构技术从（111）种子中生长的单晶HP / HT合成金刚石的缺陷。小的（1-5微米）不透明颗粒簇（有时称为“针状夹杂物”）对晶格参数差异以及每个样品中相对晶格倾斜的影响特别引起关注。研究。用大光束直径（照亮整个样品）测得的摇摆曲线给出的宽度（FWHM）在非分散的布拉格-布拉格衍射几何形状的5-30秒范围内，其中良好的金刚石晶体给出3英寸，并且对于计算的理论最小宽度小于1英寸。还使用可平移的针孔记录了每种晶体的小区域的摇摆曲线，这些曲线表明，某些钻石在选定区域（直径100微米）具有相对较窄的摇摆曲线。晶体生长的纪元记录在一系列X射线形貌图中，间隔为2.5秒。通过使样品绕布拉格平面的法线旋转，对入射光束的所有四个主要方位角（chi = 0、90、180和270度）采用这样的序列。此过程产生了有关整个样本上晶格参数分布和晶格倾斜的重要信息。对于大量填充有针尖状夹杂物的样品，得出的结论是，在晶体的某些区域中，晶格参数值可能会略有变化，但大多数落在采用的角步分辨率以下，尽管可以获得更高的精度。 。相对倾斜测量表明，靠近{111}边界的外部露头的那些晶体部分存在很大的取向不良。在（111）取向的金刚石样品的情况下，具有不同倾斜度的三个独立区域可以归因于晶体的三个部分，这些部分靠近光学可见的{111}生长扇区边界。 [参考：15]

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