Ion beam irradiation of U-, Th- and Ce-doped pyrochlores

被引：32
作者：
Lian, J.
Yudintsev, S. V.
Stefanovsky, S. V.
Wang, L. M.
Ewing, R. C.
机构：
[1] Univ Michigan, Dept Geol Sci, Ann Arbor, MI 48109 USA
[2] RAS, Inst Geol Ore Deposit, Moscow 109017, Russia
[3] SIA Radon, Moscow 119121, Russia
[4] Univ Michigan, Dept Nucl Engn & Radiol Sci, Ann Arbor, MI 48109 USA
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2007年 / 444卷 / SPEC. ISS.期
关键词：
radiation effects; nuclear waste forms; pyrochlores; ion irradiation;
D O I：
10.1016/j.jallcom.2006.10.133
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
U-, Th- and Ce-doped pyrochlores were synthesized by solid state reaction: (Ca0.62Gd0.97U0.23)(Zr0.84Ti1.34)O-6.9, (Ca0.47Gd0.95Th0.40)(Zr-1.29 Ti-0.89)O-7.05, (Ca0.44GdTh0.42)Zr2.13O7.05, Ca0.91Th0.84Zr2.25O7.(09) and Ca1.04Ce0.97Ti1.99O6.96. Their response to the radiation damage from the recoils of the alpha-decay events has been simulated by 1 MeV Kr2+ ion irradiation and studied by in situ transmission electron microscopy (TEM). An ion beam-induced pyrochlore-to-fluorite structural transition occurred for all compositions, and independent kinetics were observed for cation and anion disordering processes. Similar to the stoichiometric titanate and zirconate pyrochlores, the Ti-rich compositions are susceptible to ion beam-induced amorphization; while, the Zr-rich compositions are more radiation "resistant". A close relation between the critical amorphization temperature of the U-, Th- and Ce-doped pyrochlores and the average cation ionic radius ratio of the A- and B-sites was observed. (c) 2006 Elsevier B.V. All rights reserved.
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页码：429 / 433
页数：5
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