J. Phys. III France
Volume 4, Numéro 2, February 1994
|Page(s)||253 - 260|
J. Phys. III France 4 (1994) 253-260
Creep and diffusion in high superconductorsA. 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- , 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.
© Les Editions de Physique 1994