Damage evolution on Sm and O sublattices in Au-implanted samarium titanate pyrochlore
UNSPECIFIED. (2004) Damage evolution on Sm and O sublattices in Au-implanted samarium titanate pyrochlore. JOURNAL OF APPLIED PHYSICS, 95 (5). pp. 2866-2872. ISSN 0021-8979Full text not available from this repository.
Official URL: http://dx.doi.org/10.1063/1.1644891
Damage evolution on the Sm and O sublattices in Sm2Ti2O7 single crystals irradiated with 1 MeV Au2+ ions at 170, 300, and 700 K was studied by Rutherford backscattering spectroscopy and O-16(d,p)O-17 nuclear reaction analysis along the (001) direction. 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, determined by ion channeling, 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 processes. The critical dose for amorphization at 170 and 300 K is 0.14 displacements per atom (dpa), and a higher dose of 0.22 dpa is observed under irradiation at 700 K. During thermal annealing in an O-18 environment, a significant increase in the O-18 exchange was observed between 800 and 900 K, which is just below the previously determined critical temperature, 950 K, for amorphization in Sm2Ti2O7, suggesting that the mobility of O vacancies may be important in defining the critical temperature. (C) 2004 American Institute of Physics.
|Item Type:||Journal Article|
|Subjects:||Q Science > QC Physics|
|Journal or Publication Title:||JOURNAL OF APPLIED PHYSICS|
|Publisher:||AMER INST PHYSICS|
|Official Date:||1 March 2004|
|Number of Pages:||7|
|Page Range:||pp. 2866-2872|
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