准晶中位错Burgers矢的会聚束电子衍射测定

准晶中位错Burgers矢的会聚束电子衍射测定 CONVERGENT-BEAM ELECTRON DIFFRACTION DETERMINATION OF THE BURGERS VECTORS OF DISLOCATIONS IN QUASICRYSTALS 王仁卉 Wang Renhui Feng Jianglin Yah Yanfa Dai Mingxlng 1 2 3 first-author 冯江林 1 2 3 鄢炎发 1 2 3 戴明星 1 2 3 武汉大学物理学系 武汉大学物理学系 Department of Physics, Wuhan University Department of Physics, Wuhan University 中国科学院北京电子显微镜实验室 中国科学院北京电子显微镜实验室 武汉大学物理学系中国科学院北京电子显微镜实验室 武汉大学物理学系中国科学院北京电子显微镜实验室 首先介绍准晶中位错 Burgers 矢 b 的会聚束电子衍射测定方法,然后报导用这方法测得的 Burgers 矢.在面心二十面体准晶中鉴定出具有下列 Burgers 矢的位错:b 21 =1/2 < 1100 > ,b 22 =1/2 < 2200 > ,b 5 = < 11111 > 和b 8 = < 01010 > ,它们在平行空间的分量分别平行于二次轴（b 2 1和b 2 2）、五次轴（b 5 ）和三次轴（b 3 ）.在十次准晶中发现了两类位错,一类的 Burgers 矢平行于十次轴,b=n/4 < 100000 > （n=1,2,3,4）.另一类的Burgers 矢的平行分量沿二次轴A2P方向,它们是b 2 1= < 01000 > 和b 2 2= < 0110 > . In the present paper we illustrate the defocus convergent-beam electron diffraction （defocus-CBED） method for the Burgers vector determination of dislocations in quasicrystais（QCs）. Then we report the Burgers vectors of dislocations in QCs determined by the defocus-CBED method, including some earlier results. In the icosahedral QCs dislocations of the following Burgers vectors were identified: b 2 1=1/2 < 1,-1,1,-1,0,0 > , b 22 :-1/2 < -1,2,--1,2,0,0 > , b 5 = < -2,1,1,1,1,1 > and b 3 < -1,0,1,0,1,0 > of which the components bI in the physical subspace are parallel to the two (b 21 and b 22 ),five-（b 5 ）and three-（b 3 ）fold axes respectively. In the decagonal QCs dislocations of b=n/47 < 1, 0,0,0,0,0 > （n=1,2,3,4） ,b 21 < 0,1,0,0, -1,0 > and b 22 = < 0,1,1,- 1,-1,0 > were identified,of which the components blare Parallel to the ten- (bll0 > and two- (b 21 and b 22 )fold axes respectively. 准晶 位错 Burgers 矢 会聚束电子衍射 quasicrystal dislocation Burgers vector convergent-beam electron diffraction O77;O483 国家自然科学基金资助的课题 1993-06-01 2021-04-01 6