ELECTROCHEMICAL AG DOPING INTO YBA2CU3OY CERAMICS USING AG-BETA''-AL2O3 IONIC CONDUCTOR

Authors
MATSUMOTO Y KOINUMA M YAMAMOTO H NISHIMORI T
Citation
Y. Matsumoto et al., ELECTROCHEMICAL AG DOPING INTO YBA2CU3OY CERAMICS USING AG-BETA''-AL2O3 IONIC CONDUCTOR, Solid state ionics, 95(3-4), 1997, pp. 309-314
Citations number
8
Categorie Soggetti
Physics, Condensed Matter","Chemistry Physical
Journal title
Solid state ionics → ACNP
ISSN journal
01672738
Volume
95
Issue
3-4
Year of publication
1997
Pages
309 - 314
Database
ISI
SICI code
0167-2738(1997)95:3-4<309:EADIYC>2.0.ZU;2-E
Abstract
The electrochemical Ag doping into YBa2Cu3Oy ceramics was carried out at 400-600 degrees C using a Ag-beta ''-Al2O3 (ionic conductor)/YBa2Cu 3Oy/Ag-beta ''-Al2O3 sandwich electrolysis system. Ag was doped into t he grain boundaries of the superconducting oxide ceramics, and Ba2+ wa s released. The electrochemical doping resulted in some destruction in the grain boundaries of the YBa2Cu3Oy and the production of Ag metal, when the doping was carried out at high current density and/or high a pplied voltage. Ag was not doped by a simple chemical diffusion of Ag metal. From the results of the other electrolysis systems consisting o f Ag/Ag-beta ''-Al2O3/YBCO/Ag, a mechanism was proposed that Ag migrat ed as an ion in the grain boundaries together with the substitution fo r Ba2+.