Electrochemical intercalation of oxygen in lanthanum copper oxide at ambient temperature

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Materials Research Bulletin; (United States)

DOI:https://doi.org/10.1016/0025-5408(94)90198-8· OSTI ID:7028867

Bhavaraju, S; DiCarlo, J F; Yazdi, I; Jacobson, A J; Feng, H H; Li, Z G; Hor, P H ^[1]

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1. Univ. of Houston, Houston, TX (United States)

The electrochemical intercalation of La[sub 2]CuO[sub 4] at ambient temperature has been investigated. Galvanostatic and potential step experiments show that the oxygen atoms intercalated on oxidation are completely removed on reduction. The voltage composition profiles observed on oxidation and reduction, however, are very different and equilibrium is not attained. In particular the results obtained on reduction show clear evidence for a nucleation controlled phase separation. Samples prepared electrochemically show superconducting transitions with onset temperatures of [approximately]30 K and [approximately]42K depending on the oxygen content, in agreement with previous results. The electrochemical and T[sub c] data are discussed in relation to the proposed ambient temperature phase diagram of La[sub 2]CuO[sub 4+x].

• OSTI ID: 7028867
• Journal Information: Materials Research Bulletin; (United States), Journal Name: Materials Research Bulletin; (United States) Vol. 29:7; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360205* -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
360207 -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
CHALCOGENIDES
CHEMICAL REACTIONS
CLATHRATES
COPPER COMPOUNDS
COPPER OXIDES
DIAGRAMS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE