Room-temperature electrochemical reduction of YBa2Cu3O7 – x: Solid-state and solution chemical results

Michael Schwartz, Yosef Scolnik, Michael Rappaport, Gary Hodes, David Cahen

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13 Scopus citations


The oxygen content of polycrystalline samples of YBa2Cu3O7 – x can be reduced quantitatively, in a controlled fashion, by electrochemical techniques at room temperature in propylene carbonate. Upon reduction, the propylene carbonate undergoes an unusual reaction at the YBa2Cu3O7 – x cathode to produce propanal, apparently because of the production of an active oxygen species on the surface. The reduced materials have been characterized by X-ray powder diffraction, electrical resistivity and magnetic susceptibility. The large-grained, reduced pellets are found to be inhomogeneous with respect to x. The reduced materials exhibit a broadened transition to the superconducting state. This effect is ascribed to the formation of metastable phases formed during reduction. After a low-temperature anneal, 80, 60 and 20 K transition temperatures are observed. These results indicate that Tc is a continuous function of oxygen content, but a discontinuous function of oxygen ordering.

Original languageEnglish
Pages (from-to)339-346
Number of pages8
JournalJournal of Materials Chemistry
Issue number3
StatePublished - 1991
Externally publishedYes


  • Electrochemical reduction
  • Superconductivity
  • Y-Ba-Cu-O system


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