Damage evolution in Au-implanted Ho2Ti2O7 titanate pyrochlore

Journal Article · Fri Oct 01 00:00:00 EDT 2010 · Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms, 268(19):3009-3013

DOI:https://doi.org/10.1016/j.nimb.2010.05.029· OSTI ID:1015526

Zhang, Yanwen; Jagielski, Jacek; Bae, In-Tae; Xiang, Xia; Thome, Lionel; Balakrishnan, G; Paul, D M; Weber, William J

Damage evolution at room temperature in Ho2Ti2O7 single crystals is studied under 1 MeV Au2+ ion irradiation by Rutherford backscattering spectroscopy along the <001> direction. For a better determination of ion-induced disorder profile, an iterative procedure and a Monte Carlo code (McChasy) were used to analyze ion channeling spectra. A disorder accumulation model, with contributions from the amorphous fraction and the crystalline disorder, is fit to the Ho damage accumulation data. The damage evolution behavior indicates that the relative disorder on the Ho sublattice follows a nonlinear dependence on dose and that defect-stimulated amorphization is the primary amorphization mechanism. Similar irradiation behavior previously was observed in Sm2Ti2O7. A slower damage accumulation rate for Ho2Ti2O7, as compared with damage evolution in Sm2Ti2O7, is mainly attributed to a lower effective cross section for defect-simulated amorphization.

• 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: 1015526
• Report Number(s): PNNL-SA-68809; 19841; 34899; KC0201020; TRN: US201113%%78
• Journal Information: Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms, 268(19):3009-3013, Vol. 268, Issue 19
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
CROSS SECTIONS
ION CHANNELING
IRRADIATION
MONOCRYSTALS
PYROCHLORE
RUTHERFORD BACKSCATTERING SPECTROSCOPY
SPECTRA
TITANATES
damage accumulation
amorphization
holmium titanate pyrochlore
irradiation
Rutherford backscattering spectroscopy
Environmental Molecular Sciences Laboratory