Change in the positron annihilation lifetime of vacancy clusters containing hydrogen atoms in electron-irradiated F82H

Koichi Sato*, Yohei Kondo, Masakiyo Ohta, Qiu Xu, Atsushi Yabuuchi, Atsushi Kinomura, Masahira Onoue, Takashi Onitsuka, Masahiko Hatakeyama, Hirotomo Iwakiri, Daiji Kato, Yoshiyuki Watanabe, Hiroyasu Tanigawa

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

Abstract

The change in the positron annihilation lifetime (PAL) of vacancy clusters before and after electrolysis hydrogen charging was determined using PAL measurements in electron-irradiated F82H. The experimental change indicated 8 hydrogen atoms were trapped in vacancy clusters; whereas the theoretical calculation resulted in approximately 14 atoms. As the samples were left at room temperature for 5 min until the start of the PAL measurements, the de-trapping effect of hydrogen atoms was also considered; approximately 13 hydrogen atoms were captured at each vacancy cluster. The PAL decreased after annealing at 148 K, which could not be explained theoretically. Therefore, further experiments and discussions are needed to obtain a precise change in the PAL of vacancy clusters containing hydrogen atoms in F82H.

Original languageEnglish
Title of host publicationMaterials Science Forum
PublisherTrans Tech Publications Ltd
Pages71-78
Number of pages8
DOIs
StatePublished - 2021

Publication series

NameMaterials Science Forum
Volume1024 MSF
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Keywords

  • Electron irradiation
  • Hydrogen
  • Positron annihilation
  • Reduced activation ferritic/martensitic steels
  • Vacancy clusters

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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