Dispersive double bent crystal monochromators Si(111) + Si(311) and Si(111) + Si(400) with a strongly asymmetric diffraction geometry of the analyzer for powder diffractometry. (September 2019)

• Record Type: Journal Article
• Authors: Mikula, P.; Vrana, M.; Saroun, J.; Stammers, J.; Em, V.
• Is Part Of: Powder diffraction. Volume 34(2019)Supplement 1
• Page Start: S18
• Page End: S22
• Publication Date: 2019-09
• Subjects: Neutron diffraction, -- dispersive monochromator setting, -- bent perfect crystal, -- neutron optics; Powder metallurgy -- Periodicals; Materials -- Analysis -- Periodicals; 620.1127
• DOI: 10.1017/S0885715619000137
• Languages: English
• ISSNs: 0885-7156

Abstract

Abstract : In this paper, some results of neutron diffraction properties of the dispersive double-crystal Si(111) + Si(311) and Si(111) + Si(400) monochromator settings containing two bent perfect crystals but with the second one – analyzer in the strongly asymmetric diffraction geometry, are presented. For the sake of possible applications, both double crystal settings were tested in the orientation of the second crystal for the output beam compression geometry. Powder diffraction test was carried out on a α -Fe(211) pin of the diameter of 2 mm. Contrary to the Si(111) + Si(400) setting, an excellent resolution represented by full width at half maximum in the ( Δd/d )-scale was obtained for the Si(111) + Si(311) double crystal monochromator in the parallel as well as in the antiparallel diffraction geometry.