Abstract
In our contribution we present some important results of an exhaustive neutron diffraction studies of multiple Bragg reflections (MBR) accompanying an allowed as well as forbidden reflections. The MBR-observations were carried out, namely, in the frame of Bragg diffraction optics experiments on cylindrically bent perfect single crystals. It has been found that depending on the thickness and curvature of the crystal slabs and the diffraction geometry (reflection, transmission) many strong multiple reflections can be excited which also could be used as a source of highly monochromatic and highly collimated beams for further high-resolution neutron scattering or radiography experiments.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
REFERENCES
M. Renninger, “Die verbotenen reflexe von diamant, silicium und germanium,” Z. Phys. 106, 141–176 (1937).
P. P. Ewald, “Zur Begründung der kristalloptik,“ Z. Kristallogr. A 97, 1–27 (1937).
C. Shih-Lin, “X-ray multiple-wave diffraction: theory and application,” in Solid-State Science (Springer, Berlin–Heidelberg–New York–Tokyo, 2004), vol. 143.
Z.G. Pinsker, Dynamical Scattering of X-rays in Crystals (Springer, Berlin, 1978).
R. Moon and C.G. Shull, “The effects of simulta-neous reflections on single-crystal neutron diffraction intensities,” Acta Crystallogr. 17, 805–812 (1964).
G. Kuich and H. Rauch, “Kohärente extinktion und streuung zweiter ordnung von neutronen an einkristallen,” Acta Phys. Austriaca 20, 7–16 (1965).
P. Mikula, R.T. Michalec, M. Vrána, and J. Vávra, “Simultaneous diffraction: Umweganregung peaks in the case of a vibrating single crystal,“ Acta Crystallogr. A 35, 962–965 (1979).
M. Vrána, P. Mikula, R.T. Michalec, J. Kulda, and J. Vávra, ”Multiple Bragg reflections of neutrons 6 in an elastically deformed single crystal,” Acta Crystallogr. A 37, 459–465 (1981).
J. Kulda, ”A novel approach to dynamical neutron diffraction by a deformed crystal,” Acta Crystallogr. A 40, 120–126 (1984).
K. Blinowski and J. Sosnowski, ”Parasitic ref-lections of neutrons in crystal monochromators,” Nucl. Instrum. Methods 10, 289–294 (1961).
P. Mikula, M. Vrána, J. Šaroun, B. S. Seong, C. Woo, and C. H. Lee, ”Multiple Bragg reflections (MBR) of neutrons accompanying a strong allowed reflection of bent perfect crystal (BPC) at a constant neutron wavelength,” Phys. B 551, 327–330 (2018).
P. Mikula, M. Furusaka, K. Ohkubo, and J. Šaroun, “TOF studies of multiple Bragg reflections in cylindrically bent prefect crystals,” J. Appl. Crystallogr. 45, 1248–1253 (2012).
ACKNOWLEDGMENTS
Measurements were carried out at the CANAM infrastructure of the NPI CAS Řež. The authors thank B. Michalcová from NPI CAS for significant help with measurements and data elaborations.
Funding
P. Mikula and J. Šaroun acknowledge support from ESS participation of the Czech Republic—OP (CZ.02.1.01/0.0/ 0.0/16_013/0001794) and from the project ESS Scandinavia-CZ II (LM2018111), respectively. Furthermore P. Strunz and V. Ryukhtin acknowledge support from the Czech Academy of Sciences in the frame of the program “Strategie AV21, no. 23”.
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
The authors declare that they have no conflicts of interest.
Rights and permissions
About this article
Cite this article
Mikula, P., Ryukhtin, V. & Em, V.T. Multiple Bragg Reflections Are Not Always Negligible and Spurious. Phys. Metals Metallogr. 123, 1354–1360 (2022). https://doi.org/10.1134/S0031918X2110080X
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0031918X2110080X