D-D中子与Cu离子辐照对单晶金红石TiO_2(001)结构及光学性能的影响

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• 英文论文题名：D-D neutron and Cu-ion irradiation effects on structural and optical properties of single-crystal rutile TiO_2(001)
• 论文作者：许楠楠 ; 李公平 ; 潘小东 ; 刘欢 ; 郭熊
• 英文论文作者：XU Nan-nan ; LI Gong-ping ; PAN Xiao-dong ; LIU Huan ; GUO Xiong ; School of Nuclear Science and Technology of Lanzhou University
• 年：2015
• 作者机构：兰州大学核科学与技术学院;
• 论文关键词：D-D中子 ; Cu离子 ; 金红石TiO_2 ; 辐照损伤
• 英文论文关键词：D-D neutron ; Cu ion ; single-crystal rutile TiO_2 ; irradiation damage
• 会议召开时间：2015-09-21
• 会议录名称：中国核科学技术进展报告（第四卷）——中国核学会2015年学术年会论文集第8册（同位素分卷、辐射研究与应用分卷、核技术工业应用分卷、核农学分卷、核医学分卷、核情报分卷）
• 语种：中文
• 分类号：O614.411
• 学会代码：EGVD
• 会议名称：中国核学会2015年学术年会
• 会议地点：中国四川绵阳
• 主办单位：中国核学会
• 学会名称：中国核学会
• 页数：7
• 文件大小：420k
• 原文格式：O
• 会议级别：全国

摘要

利用D-D中子(2.5 MeV)和80 keV的Cu离子对单晶金红石TiO_2(001)材料进行辐照改性,系统地分析了样品在辐照后结构和光学性能的变化。正电子以及EXAFS分析结果表明,中子辐照会在样品内部产生大量的空位缺陷,缺陷分布贯穿整个样品。Cu离子辐照除产生空位缺陷外,还有部分Cu离子替位,空位缺陷分布最深为425 nm。中子辐照的单晶金红石表现为晶格收缩,同时样品吸收边发生蓝移。而Cu离子辐照的单晶金红石样品则表现出相反的变化趋势,即晶格膨胀,吸收边红移。分析认为,产生以上差别的主要原因和两种粒子与单晶金红石TiO_2不同的作用机理有关。
Single crystals rutile TiO_2 with(001) orientation were irradiated with 2.5 MeV D-D neutrons and 80 keV Cu ions respectively.The structural and optical properties of the irradiated single crystals were investigated using positron annihilation technique and EXAFS.The results indicated that D-D neutron as well as Cu-ion irradiation has induced a great number of defects.The induced defects of D-D neutron irradiated rutile distribute coherently throughout the wafers while the maximum damage range is approximately at 425 nm for Cu-ion irradiated rutile.Contraction in cell volume and blue shift of absorption edge toward a higher energy in the ultraviolet-light region were also observed in neutron irradiated rutile,however,due to the Cu substitution for Ti in lattice,the results of cell volume and change in band gap are quite different from that of neutron irradiated ones.

引文

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