Aurivillius-Popper mixed superconductors in BiO-CuO-(Sr0.5, Ca0.5)O system

Mikio Fukuhara, Amar S. Bhalla, Laxman N. Mulay, Robert E. Newnham

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

We report the effect of inhomogeneities on the electrical resistivity and ac magnetic susceptibility in Aurivillius-like bismuth mixed phase oxides of the BiO-CuO-(Sr0.5, Ca0.5)O system and propose a crystal structure of the major phase having highest Tc. Nominal Aurivillius compositions with molar ratios of BiO/(Sr0.5, Ca0.5)O = 1/2 are superconductors with Tcranging from 83 to 107 K, and are accompanied by a large expansion during sintering due to the formation of Kirkendall voids. Tcincreases with decreasing of the c lattice parameter. An oxide BiSrCaCu2Ox(n = 2) shows a maximum Tcvalue of 107 K and an onset of superconductivity at a much higher temperature. It seems that the structure of Bi2Sr2CaCu2Oxconsists of an Aurivillius-like phase having two perovskite layers and a Popper mixed phase. The ac magnetic susceptibility showed an overall decrease in susceptibility with time up to 220 days. This appears to be related to the relief of intralattice strain.

Original languageEnglish
Pages (from-to)273-282
Number of pages10
JournalJournal of Materials Research
Volume4
Issue number2
DOIs
Publication statusPublished - 1989 Apr

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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