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Ion Beam Irradiation-induced Amorphization in Nano-sized KxLnyTa2O7-v Tantalate Pyrochlore

Published online by Cambridge University Press:  08 March 2011

Fengyuan Lu ,
May Nyman ,
Yiqiang Shen ,
Zhili Dong ,
Gongkai Wang ,
Fuxiang Zhang ,
Rodney Ewing  and
Jie Lian
Fengyuan Lu
Affiliation:
Department of Mechanical, Aerospace & Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, U.S.A.
May Nyman
Affiliation:
Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185, U.S.A.
Yiqiang Shen
Affiliation:
Department of Mechanical, Aerospace & Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, U.S.A. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798
Zhili Dong
Affiliation:
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798
Gongkai Wang
Affiliation:
Department of Mechanical, Aerospace & Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, U.S.A. Key Laboratory for Anisotropy and Texture of Materials of Ministry of Education, Northeastern University, Shenyang, Liaoning 110004, China
Fuxiang Zhang
Affiliation:
Departments of Geological Sciences and Materials Science & Engineering, University of Michigan, Ann Arbor, MI 48109-1005, U.S.A.
Rodney Ewing
Affiliation:
Departments of Geological Sciences and Materials Science & Engineering, University of Michigan, Ann Arbor, MI 48109-1005, U.S.A.
Jie Lian
Affiliation:
Department of Mechanical, Aerospace & Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, U.S.A.
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Abstract

The radiation response of nano-sized tantalate pyrochlores, KxLnyTa2O7-v (Ln = Gd, Y, and Lu) with average grain sizes of ~ 10 nm was investigated using 1 MeV Kr2+ ion beam irradiations. EDS measurements and XRD refinement reveal that the Y3+ and Lu3+-doped samples consist of two pyrochlore phases as K0.8YTa2O6.9/K0.4Y0.8Ta2O6.4 and KLuTa2O7/K0.4Lu0.8Ta2O6.4 respectively; whereas a single phase of K0.8GdTa2O7 only exists in the Gd3+-doped tantalate pyrochlore. In situ TEM observation confirms ion beam-induced amorphization occurring in all of the nano-sized KxLnyTa2O7-v. At elevated temperatures, both K0.8GdTa2O7 and K0.8YTa2O6.9/K0.4Y0.8Ta2O6.4 exhibit higher radiation tolerance than KLuTa2O7/K0.4Lu0.8Ta2O6.4, and the critical temperatures of K0.8GdTa2O7 and K0.8YTa2O6.9/K0.4Y0.8Ta2O6.4 are estimated to be 1167 ± 41 K and 1165 ± 34 K, respectively, lower than that of KLuTa2O7/K0.4Lu0.8Ta2O6.4 (~ 1291 K). The K0.8GdTa2O7, K0.8YTa2O6.9 and KLuTa2O7 phases have less structural deviation from the parent fluorite structure and thus may be responsible for the overall radiation tolerance. The high K+ occupancy at pyrochlore A sites in KLuTa2O7 is believed to contribute to the decrease of radiation tolerance, consistent with the large ionic radius ratio of K+/Ta5+. These results highlight that the radiation tolerance of nanostructured materials is highly compositional dependent, and nano-sized tantalate pyrochlores are sensitive to radiation damage.

Keywords

nuclear materialsradiation effectsdefects
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1298: Symposium Q/R/T – Advanced Materials for Applications in Extreme Environments , 2011 , mrsf10-1298-r06-02
Copyright
Copyright © Materials Research Society 2011

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References

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