Damage Evolution on Sm and O Sublattices in Au-Implanted Samarium Titanate Pyrochlore
Journal Article
·
· Journal of Applied Physics
Damage evolution on the Sm and O sublattices in SmTiO single crystals irradiated with 1 MeV Au ions at 170, 300 and 700 K was studied by Rutherford backscattering spectroscopy and 16O(d,p)17O nuclear reaction analysis. The damage accumulation behavior at each irradiation temperature indicates that the relative disorder on the O sublattice is higher than that on the Sm sublattice, and the relative disorder on each sublattice follows a nonlinear dependence on dose that is well described by a disorder accumulation model. While there is little difference in damage accumulation behavior on the Sm sublattice at 170 and 300 K irradiation, the rate of damage accumulation decreases dramatically at 700 K due to dynamic recovery. 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 under irradiation at 700 K. During thermal annealing in an 18O environment, a significant increase in the 18O exchange was observed between 800 and 900 K, which i s just below the previously determined critical temperature, 950 K, for amorphization in SmTiO, suggesting that the mobility of O vacancies may be important in defining the critical temperature.
- 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:
- 15007113
- Report Number(s):
- PNNL-SA-39190; 1237; 3448; KC0201020
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 5 Vol. 95; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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