| Numéro |
J. Phys. Colloques
Volume 51, Numéro C1, Janvier 1990
Proceeding of the International CongressIntergranular and Interphase Boundaries in materials |
|
|---|---|---|
| Page(s) | C1-1035 - C1-1042 | |
| DOI | https://doi.org/10.1051/jphyscol:19901161 | |
J. Phys. Colloques 51, C1-1035-C1-1042 (1990)
DOI: 10.1051/jphyscol:19901161
1 CNRS, Laboratoire de Physique des Matériaux, 1 Place A. Briand, Bellevue, F-92195 Meudon, France
2 Laboratoire de Physique des Solides, Université P. Sabatier, Institut National des Sciences Appliquées, Avenue de Rangueil, F-31077 Toulouse Cedex, France
DOI: 10.1051/jphyscol:19901161
OXYGEN SELF-DIFFUSION IN YBa2Cu3O7-x : GRAIN-BOUNDARY EFFECTS
J. SABRAS1, C. DOLIN1, J. AYACHE1, C. MONTY1, R. MAURY2 et A. FERT21 CNRS, Laboratoire de Physique des Matériaux, 1 Place A. Briand, Bellevue, F-92195 Meudon, France
2 Laboratoire de Physique des Solides, Université P. Sabatier, Institut National des Sciences Appliquées, Avenue de Rangueil, F-31077 Toulouse Cedex, France
Abstract
Polycristal1ine YBa2Cu3O7-x samples with different grain size have been elaborated by sintering. Magnetic properties exhibit a strong dependence on grain size. Oxygen self-diffusion experiments in some of the samples show that this process is highly anisotropic. The diffusion profiles measured by SIMS are influenced by short-circuit effects, they are well-fitted by a grain-boundary diffusion solution. Nevertheless microstructure studies show that beside grain-boundaries few other extended defects (microcracks, thick and heterogeneous intergranular phases...) are present in the samples. Slowest volume diffusion coefficients and grain-boundary diffusion coefficients have been determined.