Small Bragg-plane slope errors revealed in synthetic diamond crystals

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

doi:10.1107/s1600577520012746

Small Bragg-plane slope errors revealed in synthetic diamond crystals

Journal Article · Mon Oct 26 00:00:00 EDT 2020 · Journal of Synchrotron Radiation (Online)

DOI:https://doi.org/10.1107/s1600577520012746· OSTI ID:1776775

Pradhan, Paresh ^[1]; Wojcik, Michael ^[1]; Huang, Xianrong ^[1]; Kasman, Elina ^[1]; Assoufid, Lahsen ^[1]; Anton, Jayson ^[1]; Shu, Deming ^[1]; Terentyev, Sergey ^[2]; Blank, Vladimir ^[2]; Kim, Kwang-Je ^[1]; ^[1]

Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Technological Inst. for Superhard and Novel Carbon Materials, Troitsk (Russia)

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^-2. These errors are only 50% larger than the 0.05 (2) µrad mm^-2 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.

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1776775

Journal Information:: Journal of Synchrotron Radiation (Online), Journal Name: Journal of Synchrotron Radiation (Online) Journal Issue: 6 Vol. 27; ISSN 1600-5775

Publisher:: International Union of CrystallographyCopyright Statement

Country of Publication:: United States

Language:: English

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Small Bragg-plane slope errors revealed in synthetic diamond crystals

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