Article (Scientific journals)
Rocking curve imaging of high quality sapphire crystals in backscattering geometry
Jafari, A.; Sergueev, I.; Bessas, D. et al.
2017In Journal of Applied Physics, 121 (4), p. 044901
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Keywords :
Backscattering; Lattice constants; Sapphire; X ray optics; Back reflection; Backscattering geometry; High resolution; Lattice spacing; Rocking curve width; Sapphire crystal; Sapphire single crystal; Stress-strain analysis; Single crystals
Abstract :
[en] We report on the characterization of high quality sapphire single crystals suitable for high-resolution X-ray optics at high energy. Investigations using rocking curve imaging reveal the crystals to be of uniformly good quality at the level of ∼10-4 in lattice parameter variations, δd/d. However, investigations using backscattering rocking curve imaging with a lattice spacing resolution of δd/d∼5×10-8 show very diverse quality maps for all crystals. Our results highlight nearly ideal areas with an edge length of 0.2-0.5 mm in most crystals, but a comparison of the back reflection peak positions shows that even neighboring ideal areas exhibit a relative difference in the lattice parameters on the order of δd/d=10- 20×10-8; this is several times larger than the rocking curve width. Stress-strain analysis suggests that an extremely stringent limit on the strain at a level of ∼100 kPa in the growth process is required in order to produce crystals with large areas of the quality required for X-ray optics at high energy. © 2017 Author(s).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Jafari, A.;  Jülich Centre for Neutron Science, JCNS and Peter Grünberg Institute PGI, JARA-FIT, Forschungszentrum Jülich GmbH, Jülich, D-52425, Germany, ESRF- the European Synchrotron, Grenoble Cedex 9, F-38043, France, Faculté des Sciences, Université de Liège, Liège, B-4000, Belgium
Sergueev, I.;  Deutsches Elektronen-Synchrotron, Hamburg, D-22607, Germany
Bessas, D.;  ESRF- the European Synchrotron, Grenoble Cedex 9, F-38043, France
Klobes, B.;  Jülich Centre for Neutron Science, JCNS and Peter Grünberg Institute PGI, JARA-FIT, Forschungszentrum Jülich GmbH, Jülich, D-52425, Germany
Roschin, B. S.;  Shubnikov Institute of Crystallography RAS, Leninskii pr-t 59, Moscow, 119333, Russian Federation
Asadchikov, V. E.;  Shubnikov Institute of Crystallography RAS, Leninskii pr-t 59, Moscow, 119333, Russian Federation, Lomonosov Moscow State University, Faculty of Physics, 1-2 Leninskiye Gory, Moscow, 119991, Russian Federation
Alexeev, P.;  Jülich Centre for Neutron Science, JCNS and Peter Grünberg Institute PGI, JARA-FIT, Forschungszentrum Jülich GmbH, Jülich, D-52425, Germany, Deutsches Elektronen-Synchrotron, Hamburg, D-22607, Germany
Härtwig, J.;  ESRF- the European Synchrotron, Grenoble Cedex 9, F-38043, France, Department of Physics, Faculty of Science, University of Johannesburg, Johannesburg, South Africa
Chumakov, A. I.;  ESRF- the European Synchrotron, Grenoble Cedex 9, F-38043, France
Wille, H.-C.;  Deutsches Elektronen-Synchrotron, Hamburg, D-22607, Germany
Hermann, Raphael ;  Université de Liège - ULiège
Language :
English
Title :
Rocking curve imaging of high quality sapphire crystals in backscattering geometry
Publication date :
2017
Journal title :
Journal of Applied Physics
ISSN :
0021-8979
eISSN :
1089-7550
Publisher :
American Institute of Physics, United States - New York
Volume :
121
Issue :
4
Pages :
044901
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 08 November 2020

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