The influence of crystal structure on ion-irradiation tolerance in the Sm(x)Yb(2-x)TiO5 series
| Autor: | Julie M. Cairney, Robert D. Aughterson, M. de los Reyes, Peter M. Baldo, Baptiste Gault, G.R. Lumpkin, Karl R. Whittle, E.A. Ryan, Katherine L. Smith |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Nuclear and High Energy Physics Materials science Crystal system 02 engineering and technology Crystal structure 021001 nanoscience & nanotechnology 01 natural sciences Amorphous solid Ion Crystallography Materials Science(all) Nuclear Energy and Engineering Transmission electron microscopy 0103 physical sciences General Materials Science Orthorhombic crystal system Irradiation 0210 nano-technology Stoichiometry |
| Zdroj: | Journal of Nuclear Materials. 471:17-24 |
| ISSN: | 0022-3115 |
| DOI: | 10.1016/j.jnucmat.2015.12.036 |
| Popis: | This ion-irradiation study covers the four major crystal structure types in the Ln 2 TiO 5 series (Ln = lanthanide), namely orthorhombic Pnma , hexagonal P6 3 /mmc , cubic (pyrochlore-like) Fd-3m and cubic (fluorite-like) Fm-3m . This is the first systematic examination of the complete Ln 2 TiO 5 crystal system and the first reported examination of the hexagonal structure. A series of samples, based on the stoichiometry Sm (x) Yb (2-x) TiO 5 (where x = 2, 1.4, 1, 0.6, and 0) have been irradiated using 1 MeV Kr 2+ ions and characterised in-situ using a transmission electron microscope. Two quantities are used to define ion-irradiation tolerance: critical dose of amorphisation ( D c ), which is the irradiating ion dose required for a crystalline to amorphous transition, and the critical temperature ( T c ), above which the sample cannot be rendered amorphous by ion irradiation. The structure type plus elements of bonding are correlated to ion-irradiation tolerance. The cubic phases, Yb 2 TiO 5 and Sm 0.6 Yb 1.4 TiO 5 , were found to be the most radiation tolerant, with T c values of 479 and 697 K respectively. The improved radiation tolerance with a change in symmetry to cubic is consistent with previous studies of similar compounds. |
| Databáze: | OpenAIRE |
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