J. Phys. III France
Volume 4, Number 2, February 1994
Page(s) 253 - 260
DOI: 10.1051/jp3:1994126
J. Phys. III France 4 (1994) 253-260

Creep and diffusion in high $\mathit{T}_\mathrm{c}$ superconductors

A. Domìnguez-Rodríguez1, M. Jiménez-Melendo1, Nan Chen2, K. C. Goretta1, S. J. Rothman2 and J. L. Routbort2

1  Departamento Física Materia Condensada, Universidad de Sevilla, Spain
2  Argonne National Laboratory, Argonne, IL60439, U.S.A.

(Received 18 Decembre 1992, revised 15 October 1993, accepted 22 October 1993)

Data from steady-state creep and tracer diffusion tests are presented for the high- $T_{\rm c}$, superconductors YBa 2Cu 3O x, and Bi 2Sri 1.7CaCu 2O y Both compounds exhibit oxygen nonstoichiometry and possess orthorhombic, layered perovskite crystal structures in which Cu occupies the B sites and the other cations occupy the A sites. For each, the A-site cations diffuse most slowly. For every species that has been measured, diffusion is much faster in the ab-plane than in the c-direction. At low stresses, both superconductors deform by diffusional creep with the ratecontrolling species being a A-site cation in YBa 2Cu 3O x.

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