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DOI	10.1016/j.actamat.2016.07.017
	Structural response of titanate pyrochlores to swift heavy ion irradiation
	Shamblin, Jacob; Tracy, Cameron L.; Ewing, Rodney C.; Zhang, Fuxiang; Li, Weixing; Trautmann, Christina; Lang, Maik
通讯作者	Lang, M (通讯作者)
发表日期	2016
ISSN	1359-6454
EISSN	1873-2453
起始页码	207
结束页码	215
卷号	117
英文摘要	The structure, size, and morphology of ion tracks resulting from irradiation of five different pyrochlore compositions (A(2)Ti(2)O(7), A = Yb, Er, Y, Gd, Sm) with 2.2 GeV Au-197 ions were investigated by means of synchrotron X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). Radiation-induced amorphization occurred in all five materials analyzed following an exponential rate as a function of ion fluence. XRD patterns showed a general trend of increasing susceptibility of amorphization with increasing ratio of A- to B-site cation ionic radii (r(A)/r(B)) with the exception of Y2Ti2O7 and Sm2Ti2O7. This indicates that the track size does not necessarily increase with r(A)/r(B), in contrast with results from previous swift heavy ion studies on Gd2Zr2-xTixO7 pyrochlore materials. For Y2Ti2O7, this effect is attributed to the significantly lower electron density of this material relative to the lanthanide bearing pyrochlores, thus lowering the electronic energy loss (dE/dx) of the high-energy ions in this composition. An energy loss normalization procedure was performed which reveals an initial increase of amorphous track size with rA/rB that saturates above a cation radius ratio larger than Gd2Ti2O7. This is in agreement with previous low-energy ion irradiation experiments and first principles calculations of the disordering energy of titanate pyrochlores indicating that the same trends in disordering energy apply to radiation damage induced in both the nuclear and electronic energy loss regimes. HRTEM images indicate that single ion tracks in Yb2Ti2O7 and Er2Ti2O7, which have small A-site cations and low r(A)/r(B), exhibit a core-shell structure with a small amorphous core surrounded by a larger disordered shell. In contrast, single tracks in Gd2Ti2O7 and Sm2Ti2O7, have a larger amorphous core with minimal disordered shells. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
关键词	INDUCED AMORPHIZATION WASTE FORM RADIATION A(2)B(2)O(7)STABILITY PLUTONIUM TRACKS
英文关键词	Pyrochlore; Amorphization; Nuclear waste; Swift heavy ions; Track formation
语种	英语
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000383005300020
来源期刊	ACTA MATERIALIA
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258856
推荐引用方式 GB/T 7714	Shamblin, Jacob,Tracy, Cameron L.,Ewing, Rodney C.,et al. Structural response of titanate pyrochlores to swift heavy ion irradiation[J]. 中国科学院青藏高原研究所,2016,117.
APA	Shamblin, Jacob.,Tracy, Cameron L..,Ewing, Rodney C..,Zhang, Fuxiang.,Li, Weixing.,...&Lang, Maik.(2016).Structural response of titanate pyrochlores to swift heavy ion irradiation.ACTA MATERIALIA,117.
MLA	Shamblin, Jacob,et al."Structural response of titanate pyrochlores to swift heavy ion irradiation".ACTA MATERIALIA 117(2016).