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学科主题: 地球科学::地质学
题名: Structural response of titanate pyrochlores to swift heavy ion irradiation
作者: Shamblin, J (Shamblin, Jacob)1, 2; Tracy, CL (Tracy, Cameron L.)9; Ewing, RC (Ewing, Rodney C.)3; Zhang, FX (Zhang, Fuxiang)3, 4; Li, WX (Li, Weixing)5, 6; Trautmann, C (Trautmann, Christina)7, 8
通讯作者: Lang, M
关键词: ELECTRONIC-ENERGY LOSS ; INDUCED AMORPHIZATION ; TRACK FORMATION ; WASTE FORM ; RADIATION ; CERAMICS ; A(2)B(2)O(7) ; DISPOSITION ; INSULATORS ; NANOSCALE
刊名: ACTA MATERIALIA
发表日期: 2016
DOI: 10.1016/j.actamat.2016.07.017
卷: 117, 期:0, 页:207-215
收录类别: SCI
合作性质: 国际
文章类型: Article
部门归属: 碰撞与隆升
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.
语种: 英语
WOS记录号: WOS:000383005300020
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7603
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Univ Tennessee, Dept Nucl Engn, Knoxville, TN 37996 USA
2.Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA
3.Stanford Univ, Dept Geol Sci, Stanford, CA 94305 USA
4.Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
5.Chinese Acad Sci, Inst Tibetan Plateau Res, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
6.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China
7.GSI Helmholtzzentrum Schwerionenforsch, D-64291 Darmstadt, Germany
8.Tech Univ Darmstadt, D-64287 Darmstadt, Germany
9.Department of Geological Sciences, Stanford University, Stanford, CA 94305-2115, USA

Recommended Citation:
Shamblin, J ,Tracy, CL ,Ewing, RC ,et al. Structural response of titanate pyrochlores to swift heavy ion irradiation[J]. ACTA MATERIALIA,2016,117(0):207-215.
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