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Ionic Current Induced Migration of a Hot Spot in GdBa2Cu3O7-δ, Ceramics

Published online by Cambridge University Press:  16 February 2011

T. Okamoto ,
B. Huybrechts  and
M. Takata
T. Okamoto
Affiliation:
Nagaoka University of Technology, Nagaoka, Niigata, 940–21, Japan
B. Huybrechts
Affiliation:
Nagaoka University of Technology, Nagaoka, Niigata, 940–21, Japan
M. Takata
Affiliation:
Nagaoka University of Technology, Nagaoka, Niigata, 940–21, Japan
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Abstract

An electric field sensitive moving hot spot appeared when a dc voltage over 5 V was applied at room temperature to GdBa2Cu3O7-δceramic thin rods under oxygen partial pressures ranging from 0.05 to 1.00 atm (5 kPa to 100 kPa). The spot moved to the negative electrode, and the direction of movement could be reversed time after time by switching the positive and negative electrode. This is believed to be caused by electric field movement of oxygen ions, thereby generating an ionic current. The total current after the appearance of the hot spot was independent of the applied voltage for every oxygen partial pressure, PO2. However the current and spot velocity increased significantly with increasing PO2. By the best of the authors's knowledge this is the first report on the influence of the PO2 on the moving hot spot. The potential use of this phenomenon as an oxygen sensor will be shown.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 369: Symposium U – Solid State Ionics IV , 1994 , 629
Copyright
Copyright © Materials Research Society 1995

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