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Graphite intercalation compound (GIC) crystal monochromators for cold neutron instruments: Characterization of KC24 by time-of-flight neutron diffraction.
Dennison, Andrew J C; Devishvili, Anton; Gutfreund, Philipp; Cubitt, Robert; Vorobiev, Alexei; Zabel, Hartmut; Wolff, Max.
Afiliación
  • Dennison AJC; Department of Physics and Astronomy, Uppsala University, P.O. Box 516, 751 20 Uppsala, Sweden.
  • Devishvili A; Department of Physics and Astronomy, Uppsala University, P.O. Box 516, 751 20 Uppsala, Sweden.
  • Gutfreund P; Institut Laue-Langevin, 71 Rue des Martyrs, Grenoble 38000, France.
  • Cubitt R; Institut Laue-Langevin, 71 Rue des Martyrs, Grenoble 38000, France.
  • Vorobiev A; Department of Physics and Astronomy, Uppsala University, P.O. Box 516, 751 20 Uppsala, Sweden.
  • Zabel H; Department of Physics and Astronomy, Ruhr-Universität Bochum, 44780 Bochum, Germany.
  • Wolff M; Department of Physics and Astronomy, Uppsala University, P.O. Box 516, 751 20 Uppsala, Sweden.
Rev Sci Instrum ; 92(2): 023306, 2021 Feb 01.
Article en En | MEDLINE | ID: mdl-33648099
Graphite intercalation compounds (GICs) are a group of layered materials that are suitable as monochromators for cold neutrons. KC24 is a particularly interesting compound in this regard as it features a large c-axis lattice spacing of 8.74 Å, high reflectivity, and the possibility to produce large crystals with mosaicity that matches the beam divergence of cold neutron guides. GICs can be synthesized with different levels of intercalation, known as the stage of the compounds. Each stage displays a specific d-spacing. Impure GIC-monochromators containing multiple stages produce mixing of neutron wavelengths, which complicates data analysis on neutron reflectometers. We discuss the implications of GIC crystal purity and stage contamination for neutron reflectometry and show how GIC crystals can be characterized by time-of-flight neutron diffraction providing an efficient and quantifiable measure of the reflected wavelength spectrum. This allows taking into account multiple wavelength contaminations and ascertains the robustness of reflectometry measurements.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Rev Sci Instrum Año: 2021 Tipo del documento: Article País de afiliación: Suecia Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Rev Sci Instrum Año: 2021 Tipo del documento: Article País de afiliación: Suecia Pais de publicación: Estados Unidos