Electrochemical behavior of YBa/sub 2/Cu/sub 3/O/sub 7/

Journal Article · Fri Jan 01 04:00:00 EST 1988 · Modern Physics Letters B; (USA)

DOI:https://doi.org/10.1142/S0217984988000539· OSTI ID:5732917

Bachtler, M; Lorenz, W J ^[1]; Schindler, W; Saemann-Ischenko, G ^[2]

---

1. Karlsruhe Univ. (T.H.) (Germany, F.R.). Inst. fuer Physikalische Chemie und Elektrochemie
2. Erlangen-Nuernberg Univ., Erlangen (Germany, F.R.). Inst. fuer Physikalische und Medizinische Strahlenkunde

The corrosion behavior of the high-T/sub c/ superconductor YBa/sub 2/Cu/sub 3/O/sub 7/ in aqueous solutions was studied at room temperature by electrochemical dc and ac methods and surface analysis. The oxidic ceramics is found to be more stable in alkaline than in acid media. The surface stability decreases with the time of contact to the electrolyte and depends strongly on the polarization conditions. Segregation and decomposition effects are observed. Aging effects are related to an increase of the ohmic resistance of the surface layers. A relatively positive reduction peak in cyclic voltammograms is correlated to the reduction of a formal Cu(III)-oxide species, which may be better examined in terms of a Cu(II)-peroxide species as (Cu/sup 2/ -O/sup -/)/sup +/. The high-T/sub c/-superconductor YBa/sub 2/Cu/sub 3/O/sub 7/ does not act as a special electrocatalyst for the anodic oxygen evolution reaction. The superconductivity of the samples is a bulk property and remains even after electrochemical surface treatment.

• OSTI ID: 5732917
• Journal Information: Modern Physics Letters B; (USA), Journal Name: Modern Physics Letters B; (USA) Vol. 2:6; ISSN 0217-9849; ISSN MPLBE
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
360205* -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
AQUEOUS SOLUTIONS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
COPPER OXIDES
CORROSION
CORROSIVE EFFECTS
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROCHEMICAL CORROSION
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PH VALUE
PHYSICAL PROPERTIES
POLARIZATION
SOLUTIONS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES