Premium
Diffuse + Bragg double scattering and specular reflection observed in the small‐angle X‐ray scattering from highly oriented pyrolytic graphite
Author(s) -
Ohmasa Yoshinori,
Chiba Ayano
Publication year - 2019
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s1600576719005648
Subject(s) - scattering , wide angle x ray scattering , specular reflection , highly oriented pyrolytic graphite , biological small angle scattering , small angle neutron scattering , optics , materials science , bragg's law , neutron scattering , bragg peak , irradiation , neutron , physics , graphite , diffraction , nuclear physics , beam (structure) , composite material
In the small‐angle scattering from as‐prepared and neutron‐irradiated highly oriented pyrolytic graphite samples, a new type of streak pattern is observed near the ‐type double Bragg scattering. This newly observed scattering is assigned as the double scattering whose first scattering is diffuse scattering near the 00 l Bragg scattering and whose second scattering is the Bragg scattering. Specular reflection from the surfaces of the crystallites or microcracks is also observed as a streak. These two types of scattering from the neutron‐irradiated sample show oscillatory behavior, unlike that from the non‐irradiated samples. The scattering is analyzed using the sharp‐boundary model, and is explained by the assumptions that the non‐irradiated sample has interfaces with a width of about 1 nm and the neutron‐irradiated sample has a slab‐like structure with a thickness of about 14 nm.