High temperature superconducting films by sol-gel preparation

M. Nagano, M. Greenblatt

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Abstract

Superconducting oxide YBa2Cu3O7-δ was prepared by a sol-gel method, using nitrates or organometallic compounds as the starting reagents and ethylene glycol as the solvent. The processing parameters for gelation and pyrolysis were investigated. Single phase YBa2Cu3O7-δ was obtained when the as-prepared gel was heated above 900°C in air. Films were prepared by painting the gels on various substrates. The best superconducting films were obtained when the as-prepared gels were heated up to 950°C and annealed at 800°C on single crystals of SrTiO3 and at 550°C on Yttrium stabilized ZrO2 (YSZ) in O2, respectively. Films with Tc(zero) = 85K were obtained on the (100) surface of single crystal SrTiO3; oriented films with Tc(zero) = 82K on the (100) surface of YSZ formed. The films obtained from organic precursors showed Tc(onset) ∼90K, however, Tc(zero) was lower (∼50K) than those of the films formed from nitrates.

Original languageEnglish (US)
Pages (from-to)595-602
Number of pages8
JournalSolid State Communications
Volume67
Issue number6
DOIs
Publication statusPublished - Aug 1988

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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