2.7 MeV Ar11+ ion irradiation induced structural evolution in Lu2(Ti2-xLux)O7-x/2 pyrochlores
2.7 MeV Ar11+ ion irradiation induced structural evolution in Lu2(Ti2-xLux)O7-x/2 pyrochlores
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DOI：
10.1016/j.jnucmat.2015.08.034
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发表时间：
2015-11
影响因子：
3.1
通讯作者：
Dongyan Yang;C. G. Liu;K. Q. Zhang;Y. Xia;Lichuan Chen;H. Liu;Yuren Li
中科院分区：
文献类型：
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作者：
Dongyan Yang;C. G. Liu;K. Q. Zhang;Y. Xia;Lichuan Chen;H. Liu;Yuren Li
研究了非化学计量比烧绿石系列Lu 2（Ti 2-xLux）O 7-x/2（x= 0-0.667）的辐射效应。用2.7MeV的Ar ~（11+）离子对多晶Lu_2（Ti_（2-x）Lux）O_（7-x）/_2样品进行辐照，辐照剂量为8 × 10 ~（14）ions/cm ~ 2。采用掠入射X射线衍射技术对辐照样品进行了表征。结果表明，Lu 2（Ti 2-xLux）O 7-x/2样品在辐照下发生了明显的非晶化和晶格膨胀。具体而言，非晶化过程主要是由Ar 11+离子的弹道核能沉积驱动的，这可以很好地描述了直接影响/缺陷刺激模型。非晶化率和晶格常数的相对变化都随x的增加而减小，表现出强烈的化学成分依赖性。然后讨论的结构紊乱和恢复能力的框架内，应用原子层模型的结果。
This paper aims to study the radiation effects of nonstoichiometric pyrochlore series Lu2(Ti2-xLux)O7-x/2(x= 0–0.667). Polycrystalline Lu2(Ti2-xLux)O7-x/2samples were irradiated with 2.7 MeV Ar11+ions up to a fluence of 8 × 1014ions/cm2. The irradiated samples were characterized using grazing incidence X-ray diffraction technique. The results reveal that Lu2(Ti2-xLux)O7-x/2samples undergo significant amorphization and lattice swelling upon irradiation. Specifically, the amorphization process is predominantly driven by ballistic nuclear energy deposition of Ar11+ions at this energy regime, which can be well described by a direct-impact/defect-stimulated model. Both the amorphization fraction and the relative variation of lattice parameter decrease with increasingx, showing a strong dependence on the chemical composition. The results are then discussed in the framework of the structural disorder and recovery ability from damage, applying an atomic layer model.