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Electrochemical Studies of the Mixed-Conductor System YBa2Cu307-δ

Published online by Cambridge University Press:  21 February 2011

G.F. Holland ,
S.L. Russek ,
A.M. Stacy  and
J.N. Michaels
G.F. Holland
Affiliation:
Department of Chemistry, University of California, Berkeley, CA 94720
S.L. Russek
Affiliation:
Department of Chemical Engineering, University of California, Berkeley, CA 94720
A.M. Stacy
Affiliation:
Department of Chemistry, University of California, Berkeley, CA 94720
J.N. Michaels
Affiliation:
Department of Chemical Engineering, University of California, Berkeley, CA 94720
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Oxygen mobility in the system YBa2Cu307-δ (0 ≤ 8 ≤ 1) has been studied by electrochemical methods over the temperature range 500 ≤ T ≤ 800 °C. The experimental cell consisted of a pellet of YBa2Cu307-δ sandwiched between an ionically-blocking Au film electrode and an electronically-blocking yttrium-stabilized zirconia electrolyte/Pt paste electrode. The concentration of mobile oxygen ions, c(02-), and the diffusion coefficient, D, were evaluated from potential step experiments. Coulometric titration studies were used to modify the oxygen content of the oxygen deficient (δ ≥ 0) material. These electrochemically-modified samples were further characterized by magnetic susceptibility measurements to monitor the effect of changes of oxygen content on the width and position of the superconducting transītion.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 135: Symposium M – Solid State Ionics I , 1988 , 612
Copyright
Copyright © Materials Research Society 1989

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