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

doi:10.1088/1674-1056/24/12/126103

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.

Keywords: radiation damage amorphization nano-crystals ceramics

Received: 01 March 2015
Revised: 27 August 2015
Accepted manuscript online:

PACS:	61.80.-x	(Physical radiation effects, radiation damage)
	61.43.-j	(Disordered solids)
	61.46.Hk	(Nanocrystals)
	77.84.Cg	(PZT ceramics and other titanates)

Fund:

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).

Corresponding Authors: Zhang Jian
E-mail: zhangjian@xmu.edu.cn,jianchng@gmail.com

Cite this article:

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) Krypton ion irradiation-induced amorphization and nano-crystal formation in pyrochlore Lu₂Ti₂O₇ at room temperature 2015 Chin. Phys. B 24 126103

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

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