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Damage accumulation and amorphization in samarium titanate pyrochlore
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UNSPECIFIED (2004) Damage accumulation and amorphization in samarium titanate pyrochlore. In: 12th International Conference on Radiation Effects in Insulators, Gramado, BRAZIL, AUG 31-SEP 05, 2003. Published in: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 218 pp. 89-94.
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Official URL: http://dx.doi.org/10.1016/j.nimb.2003.12.003
Abstract
Damage accumulation in Sm2Ti2O7 single crystals irradiated with Au2+ ions at 170, 300 and 700 K was studied by Rutherford backscattering spectrometry using a 2.0 MeV He+ beam along the <001> channeling direction. The relative disorder on the Sm sublattice follows a nonlinear dependence on ion fluence. The nonlinear behavior is described well by a disorder accumulation model that indicates a predominant role of a defect-stimulated amorphization process. The critical dose for amorphization at 300 K is similar to0.14 dpa, which is in good agreement with in situ transmission electron microscopy results for polycrystalline Sm2Ti2O7 irradiated with 600 keV Bi+ ions and with Gd2Ti2O7 doped with Cm-244. Despite the six orders of magnitude difference in damage rates, the good agreement between the amorphization doses in Sm2Ti2O7 at 300 K and Cm-244-doped Gd2Ti2O7 at 340 K indicates that damage accumulation at these temperatures is relatively independent of dose rate. (C) 2003 Elsevier B.V. All rights reserved.
| Item Type: | Conference Item (UNSPECIFIED) |
|---|---|
| Subjects: | Q Science > QC Physics |
| Journal or Publication Title: | NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS |
| Publisher: | ELSEVIER SCIENCE BV |
| ISSN: | 0168-583X |
| Date: | June 2004 |
| Volume: | 218 |
| Number of Pages: | 6 |
| Page Range: | pp. 89-94 |
| Identification Number: | 10.1016/j.nimb.2003.12.003 |
| Publication Status: | Published |
| Title of Event: | 12th International Conference on Radiation Effects in Insulators |
| Location of Event: | Gramado, BRAZIL |
| Date(s) of Event: | AUG 31-SEP 05, 2003 |
| URI: | http://wrap.warwick.ac.uk/id/eprint/8389 |
Data sourced from Thomson Reuters' Web of Knowledge
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