TY - JOUR
T1 - Intensity distribution profile of double Bragg scattering in the small-angle region from highly oriented pyrolytic graphite
AU - Ohmasa, Yoshinori
AU - Chiba, Ayano
PY - 2018/1/1
Y1 - 2018/1/1
N2 - 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.
AB - 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.
KW - double Bragg scattering
KW - highly oriented pyrolytic graphite
KW - HOPG
KW - intensity profiles
KW - small-angle X-ray scattering
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U2 - 10.1107/S2053273318012469
DO - 10.1107/S2053273318012469
M3 - Article
C2 - 30378579
AN - SCOPUS:85055285387
JO - Acta Crystallographica Section A: Foundations and Advances
JF - Acta Crystallographica Section A: Foundations and Advances
SN - 0108-7673
ER -