Poly(dicarbon monofluoride) (C2F)n bridges the neutron reflectivity gap
Nesvizhevsky V. Henry K. Dauga L. Clavier B. Le Floch S. Lychagin E. Muzychka A. Nezvanov A. Pischedda V. Teander C. Turlybekuly K. Radescu S. Vigolo B. Cahen S. Hérold C. Ghanbaja J. Zhernenkov K. Dubois M.
30 June 2024Elsevier Ltd
Carbon
2024#227
Graphites covalently intercalated with fluorine to form (C2F)n structural type compounds shows a dramatic increase of the interlayer distance up to by a factor of almost 3 to reach ∼9 Å. Such graphite fluoride compounds containing only carbon and fluorine offer the rare opportunity to bridge the so-called gap in the reflectivity of neutron reflectors. Slow neutron reflectors are of great interest in designing neutron sources as well as in fundamental and applied science; they require synthesizing high thermal and chemical compound stability graphite fluorides. In this work, a new strategy is proposed for synthesizing (C2F)n compounds in a well-controlled method. Our results show that the outcome (C2F)n has a covalent character with only sp3 hybridized carbon atoms. Moreover, C–F bonds in the fluorocarbon sheets and CF2 groups on the sheet edges lead to the desired stability and hydrophobic character. A dedicated home-made neutron diffractometer was built for measurements of double-differential neutron cross sections of crystals with specific large interlayer distances found in (C2F)n compounds. We demonstrate that the synthesized fluorine intercalated graphites developed effectively cover the gap in the reflectivity for the new generation of neutron reflectors.
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Institut Max von Laue – Paul Langevin, 71 Avenue des Martyrs, Grenoble, F-38042, France
Université Clermont Auvergne, CNRS, Clermont Auvergne INP, ICCF, 24, Avenue des Blaise Pascal, Aubière, 63178, France
Université de Lorraine, CNRS, Institut Jean Lamour, UMR 7198, Allée André Guinier, Nancy, 54000, France
Institut Lumière Matière, UMR5306 – UCBL – CNRS, 10 rue Ada Byron, Villeurbanne CEDEX, 69622, France
Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 6 Joliot Curie, Ru-141980 Dubna, Russian Federation
Department of Nuclear Engineering, North Carolina State University, Raleigh, 27695, NC, United States
The Institute of Nuclear Physics, Ministry of Energy of the Republic of Kazakhstan, Ibragimova Str. 1, Almaty, 0500032, Kazakhstan
Departamento de Física and Instituto de Materiales y Nanotecnología, MALTA Consolider Team, Universidad de La Laguna, E38200 San Cristóbal de La Laguna, Tenerife, Spain
Institut Max von Laue – Paul Langevin
Université Clermont Auvergne
Université de Lorraine
Institut Lumière Matière
Frank Laboratory of Neutron Physics
Department of Nuclear Engineering
The Institute of Nuclear Physics
Departamento de Física and Instituto de Materiales y Nanotecnología
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