Damage Evolution and Annealing of Au-Irradiated Samarium Titanate Pyrochlore

Conference · Mon Apr 05 04:00:00 EDT 2004

OSTI ID:15007639

Zhang, Yanwen; Shutthanandan, V; Thevuthasan, Suntharampillai; McCready, David E; Young, James S; Devanathan, Ram; Andreasen, Jonathan D; Balakrishnan, G; Paul, D M; Weber, William J

Damage evolution and thermal recovery of Au irradiated samarium titanate pyrochlore (SmTiO) single crystals were studied by Rutherford backscattering spectroscopy and nuclear reaction analysis. The damage accumulation follows a nonlinear dependence on dose that is well described by a disorder accumulation model, which indicates a predominant role of defect-stimulated amorphization processes. The critical dose for amorphization at 170 and 300 K is {approx}0.14 dpa, and a higher dose of {approx}0.22 dpa is observed for irradiation at 700 K, which agrees with previous in-situ transmission electron microscopy (TEM) data for polycrystalline SmTiO. Annealing in an 18O environment reveals a damage recovery stage at {approx}850 K that coincides with a significant increase in 18O exchange due to oxygen vacancy mobility. This thermal recovery stage is also consistent with the critical temperature for amorphization measured by in-situ TEM in polycrystalline samples.

• Research Organization: Pacific Northwest National Lab., Richland, WA (US), Environmental Molecular Sciences Laboratory (US)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 15007639
• Report Number(s): PNNL-SA-40141; 3448; KC0201020
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
ENVIRONMENTAL MOLECULAR SCIENCES LABORATORY
RADIATION DAMAGE
GOLD IONS
ION BEAMS
IRRADIATION
MONOCRYSTALS
NUCLEAR REACTION ANALYSIS
PYROCHLORE
RADIATION EFFECTS
RECRYSTALLIZATION
RUTHERFORD BACKSCATTERING SPECTROSCOPY
SAMARIUM COMPOUNDS
TITANATES
TRANSMISSION ELECTRON MICROSCOPY