Light ion irradiation effects on stuffed Lu2(Ti2−xLux)O7−x/2 (x = 0, 0.4 and 0.67) structures |
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Authors: | YH Li YQ WangM Zhou CP XuJA Valdez KE Sickafus |
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Affiliation: | a School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China b Materials Science & Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA |
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Abstract: | We have recently synthesized “stuffed” (i.e., excess Lu) Lu2(Ti2−xLux)O7−x/2 (x = 0, 0.4 and 0.67) compounds using conventional ceramic processing. X-ray diffraction measurements indicate that stuffing more Lu3+ cations into the oxide structure leads eventually to an order-to-disorder (O-D) transition, from an ordered pyrochlore to a disordered fluorite crystal structure. At the maximum deviation in stoichiometry (x = 0.67), the Lu3+ and Ti4+ ions become completely randomized on the cation sublattices, and the oxygen “vacancies” are randomized on the anion sublattice. Samples were irradiated with 400 keV Ne2+ ions to fluences ranging from 1 × 1015 to 1 × 1016 ions/cm2 at cryogenic temperatures (∼77 K). Ion irradiation effects in these samples were examined by using grazing incident X-ray diffraction. The results show that the ion irradiation tolerance increases with disordering extent in the non-stoichiometric Lu2(Ti2−xLux)O7−x/2. |
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Keywords: | Stuffed pyrochlore Ion irradiation Ordered pyrochlore Disordered fluorite GIXRD |
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