1990 MRS Spring Meeting
San Francisco, California
Mechanial deformation of the YBa2Cu3O7−δ high temperature superconductor under a number of different processing conditions resulted in the formation of and 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 requires some separation of the Burgers vectors into the c-axis direction. A model in which  separates into 1/6 + 1/ is consistent with the observed stacking faults.
Materials Research Society
Kramer, Matthew J.; Kvam, E. P.; and Chumbley, L. Scott, "Determination of the Formation of the 1/6 Extrinsic Stacking Faults in Deformed YBa2Cu3O7−δ" (1990). Ames Laboratory Conference Papers, Posters, and Presentations. 80.