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Al-Co-Ni十次准晶中几种变体结构的HAADF研究 被引量：4

Structural features of several different modifications of Al-Co-Ni decagonal quasicrystals revealed by HAADF-STEM technique
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摘要 结合扫描电镜X射线能谱仪得到的成分信息和透射电镜选区电子衍射得到的结构信息,确定了经过不同热处理得到的Al-Co-Ni合金中十次准晶的六种不同的变体(b-Ni、b-Co、S1、typeⅠ、typeⅡ和5f)。利用原子分辨率的高角环形暗场像(HAADF)技术主要研究了三个变体(typeⅠ、typeⅡ和5f)的二维准周期平面的结构。发现对于typeⅠ和typeⅡ两种变体,3.2nm直径的十边形原子柱的准单胞团簇比2nm直径的准单胞更合适,准单胞中心0.76nm范围内原子分布无序。同时发现typeⅡ变体的二维准晶格主要由菱形和五边形拼砌组成,相当于typeⅠ和S1两种变体的二维晶格的混合。更高分辨率的HAADF显示5f变体的2nm直径准单胞团簇中原子排列具有五次和十次两种对称,对应地得到两种原子模型;第一性原理计算表明弛豫后的五次对称的原子模型比十次的原子模型能量上更有利。 　Six modifications of Al-Co-Ni decagonal quasicrystals were prepared and further characterized by EDS and SAED.Atomic-resolution HAADF-STEM technique was used to reveal the quasi-periodical structural features of type Ⅰ,type Ⅱ and 5f modifications.Furthermore,the atomic models for 5f modification were given by combining the HAADF imaing and the ab-initio total energy calculation.
作者 宋述鹏 王建波 王仁卉 桂嘉年 赵东山 刘惠军 汤恒江
机构地区 武汉大学物理学院声光材料与器件教育部重点实验室
出处 《电子显微学报》 CAS CSCD 2007年第5期387-394,共8页 Journal of Chinese Electron Microscopy Society
基金 国家自然科学基金资助项目(No.50171047 No.50571075) 湖北省青年杰出人才基金项目(No.2005ABB014)资助.~~
关键词 十次准晶 Al-Co-Ni HAADF decagonal quasicrystal Al-Co-Ni HAADF
分类号 O753.3 [理学—晶体学] O766.1 [理学—晶体学]
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参考文献22

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共引文献17

同被引文献55

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  • 2周邦新,刘文庆.三维原子探针及其在材料科学研究中的应用[J].材料科学与工艺,2007,15(3):405-408. 被引量：15
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引证文献4

二级引证文献16

电子显微学报
2007年 第5期

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