Journal
JOURNAL OF APPLIED CRYSTALLOGRAPHY
Volume 52, Issue -, Pages 652-664Publisher
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S1600576719005648
Keywords
double scattering; diffuse scattering; small-angle X-ray scattering; highly oriented pyrolytic graphite; HOPG
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Funding
- MEXT KAKENHI [16K05521]
- Asahi Glass Foundation
- Grants-in-Aid for Scientific Research [16K05521] Funding Source: KAKEN
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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 00l 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 1nm and the neutron-irradiated sample has a slab-like structure with a thickness of about 14nm.
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