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Determination of the Formation of the 1/6[031] Extrinsic Stacking Faults in Deformed YBa2Cu3O7−δ

Published online by Cambridge University Press:  21 February 2011

M. J. Kramer ,
E. P. Kvam  and
L. S. Chumbley
M. J. Kramer
Affiliation:
Ames Laboratory, Iowa State University, Ames, IA 50011
E. P. Kvam
Affiliation:
National Center for Electron Microscopy, Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720
L. S. Chumbley
Affiliation:
Ames Laboratory, Iowa State University, Ames, IA 50011
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Abstract

Mechanial deformation of the YBa2Cu3O7−δ high temperature superconductor under a number of different processing conditions resulted in the formation of <100> and <110> edge dislocations, both having a (001) slip plane. Subsequent high temperature annealing at 900°C resulted in the formation of extrinsic stacking faults with a large separation of the partial dislocations, up to 0.35 μm, suggesting a very low minimum stacking fault energy of 1.2 × 10−2 J/m2. High resolution transmission electron microscopy (HRTEM) in conjunction with image simulations revealed that the stacking faults were comprised of an extra CuO plane between the Ba layers with an offset of b/2. The stacking fault vector of 1/6[031] requires some separation of the <010> Burgers vectors into the c-axis direction. A model in which [010] separates into 1/6[031] + 1/[031] is consistent with the observed stacking faults.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 183: Symposium E – High Resolution Electron Microscopy of Defects in Materials , 1990 , 375
Copyright
Copyright © Materials Research Society 1990

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