Superconducting, structural and thermochemical properties of La2CuO4+δ prepared by KMnO4 oxidation

E. Takayama-Muromachi, A. Navrotsky

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37 Scopus citations

Abstract

La2CuO4+δ having various δ values was prepared by the KMnO4 oxidation method in aqueous solutions at 333 K. Some samples oxidized in concentrated KMnO4 solutions underwent spinodal decomposition resulting in products having δ∼0.01 and δ∼0.22. The former showed a superconducting transition at ∼ 14 K, the latter at 40 K. The partial molar enthalpy of excess oxygen up to ∼ -57 kJ/mol O was obtained for La2CuO4+δ by high-temperature drop calorimetry. This value suggests that La2CuO4+δ is, disregarding the spinodal decomposition, thermodynamically stable in oxygen fugacities less than 1 atm at room temperature.

Original languageEnglish (US)
Pages (from-to)164-174
Number of pages11
JournalPhysica C: Superconductivity and its applications
Volume218
Issue number1-2
DOIs
StatePublished - Dec 1 1993
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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