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Title: Ion beam irradiation-induced amorphization of nano-sized KxLnyTa2O7-v tantalate pyrochlore
Authors: Lu, Fengyuan
Shen, Yiqiang
Dong, Zhili
Wang, Gongkai
Zhang, Fuxiang
Ewing, Rodney C.
Lian, Jie
Keywords: Nanostructured Pyrochlore
Radiation Tolerance
Issue Date: 2014
Source: Lu, F., Shen, Y., Dong, Z., Wang, G., Zhang, F., Ewing, R. C., et al. (2014). Ion beam irradiation-induced amorphization of nano-sized KxLnyTa2O7-v tantalate pyrochlore. Frontiers in Energy Research, 2, 48-.
Series/Report no.: Frontiers in Energy Research
Abstract: Nano-sized (~10–15 nm) tantalate pyrochlores KxLnyTa2O7-v (Ln = Gd, Y, and Lu) were irradiated with 1 MeV Kr2+ beams at different temperatures and their radiation response behaviors were studied by in situ transmission electron microscopy observations. All of these nano-sized KxLnyTa2O7-v pyrochlores are sensitive to radiation-induced amorphization with low-critical doses (~0.12 dpa) at room temperature and high-critical amorphization temperatures above 1160 K. The K+ plays a key role in determining the radiation response of tantalate pyrochlores, in which the K+-rich KLuTa2O7 displays greater amorphization susceptibility than K0.8GdTa2O6.9 and K0.8YTa2O6.9 with lower K+ occupancy at the A-site. The reduced amorphization tolerance of the composition with a greater K+ content is consistent with the prominently larger K+/Ta5+ cationic radius ratio, which may result in more structural deviation from the parent fluorite structure and less capability to accommodate radiation-induced defects. An empirical correlation between critical amorphization temperature and ionic size was derived, generally describing the dominant effect of the cation ionic size in controlling radiation response of a wide range of pyrochlore compounds as potential nuclear waste forms. The results of the tantalate pyrochlore in this work highlight that nanostructured pyrochlores are not intrinsically radiation tolerant and their responses are highly compositional dependent.
DOI: 10.3389/fenrg.2014.00048
Schools: School of Materials Science & Engineering 
Rights: © 2014 The Author(s) (published by Frontiers). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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