中国物理B ›› 1993, Vol. 2 ›› Issue (1): 35-41.doi: 10.1088/1004-423X/2/1/005

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DISLOCATION DISSOCIATION ON CLIMB PLANE IN TEXTURED YBa2Cu3O7-δ SUPERCONDUCTOR

郑建国, 李齐, 冯端   

  1. National Laborotory of Solid State Microstructures, Nanjing University, Nanjing 210008, China
  • 收稿日期:1992-03-05 出版日期:1993-01-20 发布日期:1993-01-20
  • 基金资助:
    Project supported by the National Center for Research & Development on Superconductivity of China and the National Natural Science Foundation of China.

DISLOCATION DISSOCIATION ON CLIMB PLANE IN TEXTURED YBa2Cu3O7-$\delta$ SUPERCONDUCTOR

ZHENG JIAN-GUO (郑建国), LI QI (李齐), FENG DUAN (冯端)   

  1. National Laborotory of Solid State Microstructures, Nanjing University, Nanjing 210008, China
  • Received:1992-03-05 Online:1993-01-20 Published:1993-01-20
  • Supported by:
    Project supported by the National Center for Research & Development on Superconductivity of China and the National Natural Science Foundation of China.

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摘要： Using high resolution electron microscopy, the structure of [100] tilt boundary with misorientation of 1.2° in YBa2Cu3O7-δ has been determined. The boundary is shown to consist of an array of partial dis-locations, These partials result from the dissociation of a perfect dislocation with a Burgers vector [0, 0, c] on its climb plane according to the reaction, b→b1+b2+b1+b2+b1+b2. Here b=[00c], b1=[O,b/2, c/6} (or [a/2, 0, c/6] ). b2=[0, -b/2. c/6] (or[ -a/2, 0, c/6] ). The spacing between the perfect dislocations satisfies the Read-Shockley formula. There exist no amorphous phases in the boundary region.

Abstract: Using high resolution electron microscopy, the structure of [100] tilt boundary with misorientation of 1.2° in YBa2Cu3O7-$\delta$has been determined. The boundary is shown to consist of an array of partial dis-locations, These partials result from the dissociation of a perfect dislocation with a Burgers vector [0, 0, c] on its climb plane according to the reaction, b→b1+b2+b1+b2+b1+b2. Here b=[00c], b1=[O,b/2, c/6} (or [a/2, 0, c/6] ). b2=[0, -b/2. c/6] (or[ -a/2, 0, c/6] ). The spacing between the perfect dislocations satisfies the Read-Shockley formula. There exist no amorphous phases in the boundary region.

中图分类号:  (Granular, melt-textured, amorphous, and composite superconductors)

  • 74.81.Bd
61.72.Ff (Direct observation of dislocations and other defects (etch pits, decoration, electron microscopy, x-ray topography, etc.)) 61.72.Mm (Grain and twin boundaries)