Epoxy-encapsulated ceramic superconductor microelectrodes

A procedure is outlined for fabricating well-behaved microelectrodes from ceramic pellets of YBa sub 2 Cu sub 3 O sub 7 and Bi sub 2 Sr sub 2 CaCu sub 2 O sub 8 which involves systematic polishing of an epoxy-encapsulated superconductor chip, under Et sub 4 NClO sub 4 /acetonitrile solution, to a po...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 1989-12, Vol.136 (12), p.3696-3701
Main Authors: GOLLMAR, R. O, MCDEVITT, J. T, MURRAY, R. W, COLLMAN, J. P, YEE, G. T, LITTLE, W. A
Format: Article
Language:English
Subjects:
360201 - Ceramics, Cermets, & Refractories- Preparation & Fabrication
360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies
360204 - Ceramics, Cermets, & Refractories- Physical Properties
426001 - Engineering- Superconducting Devices & Circuits- (1990-)
ACETONITRILE
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMISTRY
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL TEMPERATURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROCHEMISTRY
ELECTRODES
Exact sciences and technology
FABRICATION
General and physical chemistry
GEOMETRY
HIGH TEMPERATURE
MATERIALS SCIENCE
MATHEMATICS
MICROELECTRONICS
NITRILES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
POTENTIOMETRY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTING DEVICES
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TITRATION
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VOLTAMETRY
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
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Description
Summary:A procedure is outlined for fabricating well-behaved microelectrodes from ceramic pellets of YBa sub 2 Cu sub 3 O sub 7 and Bi sub 2 Sr sub 2 CaCu sub 2 O sub 8 which involves systematic polishing of an epoxy-encapsulated superconductor chip, under Et sub 4 NClO sub 4 /acetonitrile solution, to a potentiometric end point. Voltammetry of the resulting microelectrodes in acetonitrile is illustrated and compared to that arising from alternative superconductor electrode geometries. The microelectrodes have active electrode surface areas ranging from 2 x 10 exp --6 -3 x 10 exp --4 cm exp 2 , as characterized electrochemically and microscopically. The results discussed are significant steps toward developing the methodology necessary to study the electrochemical response of high temperature superconductor phases at temperatures below their superconductor critical temperature. Graphs, Photomicrographs. 28 ref.--AA
ISSN:0013-4651
1945-7111
DOI:10.1149/1.2096532