中国物理B ›› 2015, Vol. 24 ›› Issue (12): 126103-126103.doi: 10.1088/1674-1056/24/12/126103

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Krypton ion irradiation-induced amorphization and nano-crystal formation in pyrochlore Lu2Ti2O7 at room temperature

谢秋荣, 张建, 尹东明, 郭奇勋, 李宁   

  1. College of Energy, Xiamen University, Xiamen 361005, China
  • 收稿日期:2015-03-01 修回日期:2015-08-27 出版日期:2015-12-05 发布日期:2015-12-05
  • 通讯作者: Zhang Jian E-mail:zhangjian@xmu.edu.cn,jianchng@gmail.com
  • 基金资助:

    Project sponsored by the National Natural Science Foundation of China (Grant No. 11205128) and the Fundamental Research Funds for the Central Universities, China (Grant No. 2012121034).

Krypton ion irradiation-induced amorphization and nano-crystal formation in pyrochlore Lu2Ti2O7 at room temperature

Xie Qiu-Rong (谢秋荣), Zhang Jian (张建), Yin Dong-Min (尹东明), Guo Qi-Xun (郭奇勋), Li Ning (李宁)   

  1. College of Energy, Xiamen University, Xiamen 361005, China
  • Received:2015-03-01 Revised:2015-08-27 Online:2015-12-05 Published:2015-12-05
  • Contact: Zhang Jian E-mail:zhangjian@xmu.edu.cn,jianchng@gmail.com
  • Supported by:

    Project sponsored by the National Natural Science Foundation of China (Grant No. 11205128) and the Fundamental Research Funds for the Central Universities, China (Grant No. 2012121034).

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摘要：

Polycrystalline pyrochlore Lu2Ti2O7 pellets are irradiated with 600-keV Kr3+ ions up to a fluence of 1.45× 1016 Kr3+/cm2. Irradiation induced structural modifications are examined by using grazing incidence x-ray diffraction (GIXRD) and cross-sectional transmission electron microscopy (TEM). The GIXRD reveals that amorphous fraction increases with the increase of fluences up to 2× 1015 Kr3+/cm2, and the results are explained with a direct-impact model. However, when the irradiation fluence is higher than 2× 1015 Kr3+/cm2, the amorphous fraction reaches a saturation of ～ 80%. Further TEM observations imply that nano-crystal is formed with a diameter of ～ 10 nm within the irradiation layer at a fluence of 4×1015 Kr3+/cm2. No full amorphization is achieved even at the highest fluence of 1.45× 1016 Kr3+/cm2 (～ 36 displacement per atom). The high irradiation resistance of pyrochlore Lu2Ti2O7 at higher fluence is explained on the basis of enhanced radiation tolerance of nano-crystal structure.

关键词: radiation damage, amorphization, nano-crystals, ceramics

Abstract:

Polycrystalline pyrochlore Lu2Ti2O7 pellets are irradiated with 600-keV Kr3+ ions up to a fluence of 1.45× 1016 Kr3+/cm2. Irradiation induced structural modifications are examined by using grazing incidence x-ray diffraction (GIXRD) and cross-sectional transmission electron microscopy (TEM). The GIXRD reveals that amorphous fraction increases with the increase of fluences up to 2× 1015 Kr3+/cm2, and the results are explained with a direct-impact model. However, when the irradiation fluence is higher than 2× 1015 Kr3+/cm2, the amorphous fraction reaches a saturation of ～ 80%. Further TEM observations imply that nano-crystal is formed with a diameter of ～ 10 nm within the irradiation layer at a fluence of 4×1015 Kr3+/cm2. No full amorphization is achieved even at the highest fluence of 1.45× 1016 Kr3+/cm2 (～ 36 displacement per atom). The high irradiation resistance of pyrochlore Lu2Ti2O7 at higher fluence is explained on the basis of enhanced radiation tolerance of nano-crystal structure.

Key words: radiation damage, amorphization, nano-crystals, ceramics

中图分类号:  (Physical radiation effects, radiation damage)

  • 61.80.-x
61.43.-j (Disordered solids) 61.46.Hk (Nanocrystals) 77.84.Cg (PZT ceramics and other titanates)