Accumulation of radiation damage and disordering in MgAl2O 4 under swift heavy ion irradiation

Kazuhiro Yasudaa, Tomokazu Yamamotoa, Motoki Etoh, Shinji Kawasoea, Syo Matsumura, Norito Ishikawa

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Accumulation and recovery of radiation-induced damage with swift heavy ions in stoichiometric magnesium aluminate spinel, MgAl2O4, has been investigated. Microstructural change and atomic disordering was examined through transmission electron microscopy (TEM) techniques, with bright-field (BF) and high-resolution (HR) TEM images, and high angular resolution electron channelling X-ray spectroscopy (HARECXS), for single crystal MgAl2O4 irradiated with 200 MeV Xe, and 340 or 350 MeV Au ions. The density of core damage region, detected by BFTEM with Fresnel-contrast, increased proportionally with ion fluence at the early stage of accumulation and saturated at a fluence higher than 1016 ions m-2. This result is discussed with a balance between the formation and recovery of the core damage region under irradiation, and the influence region to induce the recovery was evaluated to be 7-9 nm in radius. HARECXS and electron diffraction analysis revealed that cations at tetrahedral sites preferentially occupy octahedral sites to transform to defective rock-salt structure. The structure of the core damage region is found from HR and BFTEM images to be a columnar vacancy-rich region with a low atomic density.

Original languageEnglish
Pages (from-to)1082-1088
Number of pages7
JournalInternational Journal of Materials Research
Volume102
Issue number9
DOIs
Publication statusPublished - 2011

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Accumulation of radiation damage and disordering in MgAl<sub>2</sub>O <sub>4</sub> under swift heavy ion irradiation'. Together they form a unique fingerprint.

Cite this