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Intensity distribution profile of double Bragg scattering in the small‐angle region from highly oriented pyrolytic graphite
Author(s) -
Ohmasa Yoshinori,
Chiba Ayano
Publication year - 2018
Publication title -
acta crystallographica section a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.742
H-Index - 83
ISSN - 2053-2733
DOI - 10.1107/s2053273318012469
Subject(s) - highly oriented pyrolytic graphite , scattering , materials science , crystallite , bragg peak , wide angle x ray scattering , bragg's law , intensity (physics) , optics , streak , molecular physics , pyrolytic carbon , graphite , physics , small angle neutron scattering , diffraction , chemistry , neutron scattering , beam (structure) , organic chemistry , pyrolysis , metallurgy , composite material
It is observed that radial streak patterns of double Bragg scattering appear in the small‐angle X‐ray scattering from highly oriented pyrolytic graphite (HOPG). The intensity profile of double Bragg scattering from an HOPG sample is calculated theoretically. Assuming that the c axes of the graphite crystallites in the HOPG sample are distributed around an orientation vector and their distribution function has a Gaussian form, it is found that the intensity profile of double Bragg scattering is expressed by a double Gaussian function of the scattering angle and the azimuthal angle of the streak. The calculated intensity profile is compared with the experimental one. The method developed in this article can be used to estimate the orientational distribution of crystallites in uniaxial polycrystalline materials.