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在合成金刚石晶体中发现的小布拉格平面斜率误差。

Small Bragg-plane slope errors revealed in synthetic diamond crystals.

作者信息

Pradhan Paresh, Wojcik Michael, Huang Xianrong, Kasman Elina, Assoufid Lahsen, Anton Jayson, Shu Deming, Terentyev Sergey, Blank Vladimir, Kim Kwang Je, Shvyd'ko Yuri

机构信息

Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA.

Technological Institute for Superhard and Novel Carbon Materials, 142190 Troitsk, Russian Federation.

出版信息

J Synchrotron Radiat. 2020 Nov 1;27(Pt 6):1553-1563. doi: 10.1107/S1600577520012746. Epub 2020 Oct 26.

DOI:10.1107/S1600577520012746
PMID:33147180
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7842206/
Abstract

Wavefront-preserving X-ray diamond crystal optics are essential for numerous applications in X-ray science. Perfect crystals with flat Bragg planes are a prerequisite for wavefront preservation in Bragg diffraction. However, this condition is difficult to realize in practice because of inevitable crystal imperfections. Here, X-ray rocking curve imaging is used to study the smallest achievable Bragg-plane slope errors in the best presently available synthetic diamond crystals and how they compare with those of perfect silicon crystals. It is shown that the smallest specific slope errors in the best diamond crystals are about 0.08 (3) µrad mm. These errors are only 50% larger than the 0.05 (2) µrad mm specific slope errors measured in perfect silicon crystals. High-temperature annealing at 1450°C of almost flawless diamond crystals reduces the slope errors very close to those of silicon. Further investigations are in progress to establish the wavefront-preservation properties of these crystals.

摘要

波前保持型X射线金刚石晶体光学器件对于X射线科学中的众多应用至关重要。具有平坦布拉格平面的完美晶体是布拉格衍射中波前保持的先决条件。然而，由于不可避免的晶体缺陷，这种条件在实践中很难实现。在此，利用X射线摇摆曲线成像来研究目前可得的最佳合成金刚石晶体中可实现的最小布拉格平面斜率误差，以及它们与完美硅晶体的斜率误差相比情况如何。结果表明，最佳金刚石晶体中最小的特定斜率误差约为0.08 (3) μrad/mm。这些误差仅比在完美硅晶体中测得的0.05 (2) μrad/mm特定斜率误差大50%。对几乎无缺陷的金刚石晶体在1450°C下进行高温退火可将斜率误差降低到非常接近硅晶体的水平。正在进行进一步研究以确定这些晶体的波前保持特性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/256a/7842206/832008bc5ac3/s-27-01553-fig15.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/256a/7842206/832008bc5ac3/s-27-01553-fig15.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/256a/7842206/37e7dfd03f3e/s-27-01553-fig1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/256a/7842206/7305f27049d5/s-27-01553-fig2.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/256a/7842206/7bce14416309/s-27-01553-fig7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/256a/7842206/9cac879cb661/s-27-01553-fig8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/256a/7842206/1285c77c2525/s-27-01553-fig9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/256a/7842206/80afd3af1eee/s-27-01553-fig10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/256a/7842206/d61673c9b71f/s-27-01553-fig11.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/256a/7842206/c99cd6a2fa92/s-27-01553-fig12.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/256a/7842206/9e141df2dcab/s-27-01553-fig13.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/256a/7842206/e5aed5066355/s-27-01553-fig14.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/256a/7842206/832008bc5ac3/s-27-01553-fig15.jpg

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