Damage Processes In MgO Irradiated With Medium-energy Heavy Ions

Journal Article · Wed Apr 01 00:00:00 EDT 2015 · Acta Materialia, 88:314-322

DOI:https://doi.org/10.1016/j.actamat.2015.01.011· OSTI ID:1178494

Moll, Sandra J.; Zhang, Y.; Debelle, A.; Thome, Lionel; Crocombette, J. -P.; Zhu, Zihua; Jagielski, Jacek; Weber, William J.

The micro-structural modifications produced in MgO single crystals exposed to medium-energy heavy ions (1.2-MeV Au) were investigated using Rutherford backscattering spectrometry in channeling geometry coupled to Monte-Carlo analyses, secondary ion mass spectrometry, X-ray diffraction and transmission electron microscopy. The damage accumulation and the elastic strain variation were interpreted in the framework of the multi-step damage accumulation (MSDA) model. Both build-ups follow a multi-step process similar to that recently observed for ion-irradiated yttria-stabilized zirconia (YSZ) single crystals. However, in MgO, an unexpectedly high disorder level occurs far beyond the theoretical damage distribution. These results strongly suggest that the migration of defects created in the near-surface layer is most likely at the origin of the broadening of the damage depth distribution in MgO.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1178494
• Report Number(s): PNNL-SA-108417; 47459; KP1704020
• Journal Information: Acta Materialia, 88:314-322, Journal Name: Acta Materialia, 88:314-322
• Country of Publication: United States
• Language: English

Related Subjects

Environmental Molecular Sciences Laboratory