Diffuse + Bragg double scattering and specular reflection observed in the small-angle X-ray scattering from highly oriented pyrolytic graphite

Yoshinori Ohmasa, Ayano Chiba

Research output: Contribution to journalArticle

Abstract

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 1 nm and the neutron-irradiated sample has a slab-like structure with a thickness of about 14 nm.

Original languageEnglish
Pages (from-to)652-664
Number of pages13
JournalJournal of Applied Crystallography
Volume52
Issue number3
DOIs
Publication statusPublished - 2019 Jun 1

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Graphite
Neutrons
X ray scattering
X-Rays
Scattering
Small Angle Scattering
Microcracks
Crystallites

Keywords

  • diffuse scattering
  • double scattering
  • highly oriented pyrolytic graphite
  • HOPG
  • small-angle X-ray scattering

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

Cite this

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title = "Diffuse + Bragg double scattering and specular reflection observed in the small-angle X-ray scattering from highly oriented pyrolytic graphite",
abstract = "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 1 nm and the neutron-irradiated sample has a slab-like structure with a thickness of about 14 nm.",
keywords = "diffuse scattering, double scattering, highly oriented pyrolytic graphite, HOPG, small-angle X-ray scattering",
author = "Yoshinori Ohmasa and Ayano Chiba",
year = "2019",
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publisher = "International Union of Crystallography",
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TY - JOUR

T1 - Diffuse + Bragg double scattering and specular reflection observed in the small-angle X-ray scattering from highly oriented pyrolytic graphite

AU - Ohmasa, Yoshinori

AU - Chiba, Ayano

PY - 2019/6/1

Y1 - 2019/6/1

N2 - 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 1 nm and the neutron-irradiated sample has a slab-like structure with a thickness of about 14 nm.

AB - 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 1 nm and the neutron-irradiated sample has a slab-like structure with a thickness of about 14 nm.

KW - diffuse scattering

KW - double scattering

KW - highly oriented pyrolytic graphite

KW - HOPG

KW - small-angle X-ray scattering

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