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.
Received: 05 March 1992
Accepted manuscript online:
PACS:
74.81.Bd
(Granular, melt-textured, amorphous, and composite superconductors)
Fund: Project supported by the National Center for Research & Development on Superconductivity of China and the National Natural Science Foundation of China.
Cite this article:
ZHENG JIAN-GUO (郑建国), LI QI (李齐), FENG DUAN (冯端) DISLOCATION DISSOCIATION ON CLIMB PLANE IN TEXTURED YBa2Cu3O7-$\delta$ SUPERCONDUCTOR 1993 Acta Physica Sinica (Overseas Edition) 2 35
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