Intensity distribution profile of double Bragg scattering in the small‐angle region from highly oriented pyrolytic graphite

• Published in: Acta crystallographica. Section A, Foundations and advances Vol. 74; no. 6; pp. 681 - 698
• Main Authors: Ohmasa, Yoshinori, Chiba, Ayano
• Format: Journal Article
• Language: English
• Published: 5 Abbey Square, Chester, Cheshire CH1 2HU, England International Union of Crystallography 01.11.2018
• Subjects: double Bragg scattering; highly oriented pyrolytic graphite; HOPG; intensity profiles; small‐angle X‐ray scattering; highly oriented pyrolytic graphite; small-angle X-ray scattering; intensity profiles; double Bragg scattering; HOPG
• ISSN: 2053-2733; 2053-2733
• DOI: 10.1107/S2053273318012469

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. The intensity profile of double Bragg scattering from uniaxial polycrystalline materials, such as highly oriented pyrolytic graphite (HOPG), is calculated theoretically and compared with that observed experimentally. The intensity profile is related to the orientational distribution of crystallites.