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High-Resolution Analysis Using Bent Perfect Crystal in Powder Diffraction: Part II

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Abstract

As a continuation of our recent studies of α-Fe(211) samples at a scattering angle of 2θS = 88° (Part I), a three-axis setup using bent perfect crystal monochromator and several analyzers was tested in the diffraction study of polycrystalline α-Fe(110) pins with a diameter of 8 and 2 mm at a scattering angle of 2θS = 47.1°. After realizing the focusing conditions in real and momentum space at a neutron wavelength of 0.162 nm, a high angular resolution was achieved up to FWHM(Δd/d) = 1.4 × 10–3 and FWHM(Δd/d) = 2.5 × 10–3 for α-Fe samples with a diameter of 2 and 8 mm, respectively. This resolution was obtained by using open beams, i.e., without Soller collimators within the used range of the curvatures of the analyzers. Such settings can be used in powder diffraction, namely, in studies of high-resolution residual stresses and/or analysis of diffraction profiles with a small difference in the lattice parameters or a small change due to the application of an external load.

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ACKNOWLEDGMENTS

We thank Ms. B. Michalcová for significant assistance in measurements and basic data processing.

Funding

Measurements were carried out in the Center of Accelerators and Nuclear Analytical Methods, Nuclear Physics Institute of the Czech Academy of Sciences (CANAM NPI CAS) at Řež infrastructure (MŠMT project no. LM2015056). The presented experiments were also supported in the frame of the MŠMT projects: LM2015048 and the infrastructural “Experimental nuclear reactors LVR-15 and LR-0”. Bragg diffraction optics investigations are carried out in the Czech Republic with the support of ESS (project no. LM2010011: “Contribution to Partnership in Large Research Infrastructure of Pan-European Importance”).

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Authors and Affiliations

  1. Nuclear Physics Institute, Czech Academy of Sciences, 250 68, Řež, Czech Republic

    P. Mikula, J. Šaroun & J. Stammers

  2. National Research Centre “Kurchatov Institute”, 123182, Моscow, Russia

    V. Em

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  1. P. Mikula
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  2. J. Šaroun
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  3. J. Stammers
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  4. V. Em
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Correspondence to P. Mikula.

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Mikula, P., Šaroun, J., Stammers, J. et al. High-Resolution Analysis Using Bent Perfect Crystal in Powder Diffraction: Part II. J. Surf. Investig. 14 (Suppl 1), S151–S155 (2020). https://doi.org/10.1134/S1027451020070332

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