| Numéro |
J. Phys. III France
Volume 4, Numéro 2, February 1994
|
|
|---|---|---|
| Page(s) | 253 - 260 | |
| DOI | https://doi.org/10.1051/jp3:1994126 | |
J. Phys. III France 4 (1994) 253-260
Creep and diffusion in high
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)
Abstract
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