ChemInform Abstract: Stability of YBa2Cu3O7‐δ in Alkaline Solution.

Park, J. C.; Wattiaux, A.; Grenier, J.‐C.; Hagenmuller, Paul

doi:10.1002/chin.199229004

ChemInform

1992

DOI: 10.1002/chin.199229004

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ChemInform Abstract: Stability of YBa2Cu3O7‐δ in Alkaline Solution.

J. C. Park

A. Wattiaux

J.‐C. Grenier

et al.

Abstract: 1992 electric properties, superconductors, semiconductors electric properties, superconductors, semiconductors D 8000 -004Stability of YBa2Cu3O7-δ in Alkaline Solution.-Degradation of high Tc superconductors is one of the most important problems in practical applications and, therefore, the behavior of the title superconductor in alkaline solution is investigated. It is shown that in a decarbonated solution (pH ≥ 7), YBa2Cu3O7-δ is relatively stable for several days but a slight degradation occurs through form… Show more

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“…In addition, the electrochemical oxidation may even be impossible in such aggressive media, as for instance for compounds containing Ba or Bi cations. 10 A significant corrosion appears, resulting from the combined action of water ͑hydrolysis͒ and carbonate anions ͑carbonata-tion͒ present in strong alkaline solutions.…”

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Room-Temperature Electrochemical Intercalation of Oxygen or Fluorine into La[sub 2]CuO[sub 4] Using Organic Electrolytic Media: Mechanistic Approach

Delville

Barbut

Wattiaux

et al. 2004

J. Electrochem. Soc.

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The electrochemical intercalation of oxygen into La 2 CuO 4 has been studied in various anhydrous organic media. Several combinations between an organic solvent and a supporting electrolyte have been examined. The addition of an oxygen source such as KO 2 or H 2 O has been found to be unnecessary. Experiments have shown that the electrochemical oxygen insertion mainly implies the decomposition of the solvent leading to the formation of oxygen species able to oxidize the starting material. La 2 CuO 4.10 has been prepared in the DMSO associated with nBu 4 NClO 4 . A superconducting behavior is observed below 44 K and the physical characterizations of the material before and after controlled anodic polarization are reported. It has also been shown that this intercalation reaction is reversible. The mechanism of the oxygen intercalation is tentatively proposed with respect to the organic media. Fluorine has also been intercalated for the first time in such media.Oxides showing high oxidation states of metal cations are usually prepared at high temperatures under high oxygen pressures, which gives the thermodynamically stable form of the compound. Preparing such oxides at lower temperatures ͑20-300°C͒ requires reactions of ''Chimie Douce''-type, 1 often leading to metastable compounds. Besides the use of highly oxidizing reagents, 2,3 electrochemical processes have been used and many studies have shown that the use of the electric field as the driving force for redox reactions can be very beneficial in solid-state chemistry for preparing new materials at about room temperature, as for instance in the field of batteries. Initiated for the first time in 1989, the electrochemical oxidation appeared as an efficient ''Chimie Douce'' technique for intercalating oxygen into oxide host networks. 4 It is carried out in air, at room temperature, in alkaline media, and allows preparing noteworthy materials, some having never been obtained with classic synthesis routes used in solid-state chemistry.In alkaline solution, in the vicinity of the oxygen evolution, under anodic potentials, a very high oxygen activity can be obtained at the electrode surface according toOn metallic electrodes, such a reaction competes with the formation of oxide thin films ͑i.e., Al 2 O 3 , ZnO, CuO, TiO 2 ,...) 5 whereas on appropriate oxide electrodes such as A x M m O y 1 not only the surface is affected but also the bulk. When analyzed in electrochemistry, these materials present (i, E) curves which exhibit a typical plateau at potentials lower than that corresponding to oxygen evolution, which is the signature of an oxidation process according towhere A is an alkaline-earth or a lanthanide ion and M a 3d transition metal and 2␦ ϭ the number of exchanged electrons corresponding to the amount of oxidized metal cations (Cu 3ϩ for La 2 CuO 4 ). 6 Various oxides have thus been prepared and characterized, 1 some of them exhibiting quite original properties such as superconductivity for La 2 CuO 4.09 , 7 charge density ordering in La 2 NiO 4.25 , 8 ferro...

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mentioning

confidence: 99%

Room-Temperature Electrochemical Intercalation of Oxygen or Fluorine into La[sub 2]CuO[sub 4] Using Organic Electrolytic Media: Mechanistic Approach

Delville

Barbut

Wattiaux

et al. 2004

J. Electrochem. Soc.

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ChemInform Abstract: Stability of YBa2Cu3O7‐δ in Alkaline Solution.

Cited by 1 publication

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Room-Temperature Electrochemical Intercalation of Oxygen or Fluorine into La[sub 2]CuO[sub 4] Using Organic Electrolytic Media: Mechanistic Approach

Room-Temperature Electrochemical Intercalation of Oxygen or Fluorine into La[sub 2]CuO[sub 4] Using Organic Electrolytic Media: Mechanistic Approach

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