Effects of fluorination on the 90 K superconductor Ba2RCu3O7-δ(R=Y, Eu; 0≤δ≤1)

S. M. Zahurak, D. W. Murphy, S. Nakahara, W. W. Warren, D. M. Krol, A. M. Thayer, D. C. Douglass, G. F. Brennert, S. H. Glarum, E. M. Gyorgy, S. M. Fine, M. Greenblatt

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Abstract

Substitution of fluorine for oxygen in samples of the type Ba2YCu3O7-δ(0≤δ≤1) is of interest because oxygen and fluorine have similar ionic radii and a variety of oxyfluorides are known to exist. This work describes fluorination of sintered pellets of Ba2RCu3O7-δ (R=Y, Eu; (0≤δ≤1). Fluorination of Ba2YCu3O6.92 affords a nominal composition of Ba 2YCu3O6.4F1.3 and Tc(onset)=92 K. Fluorination of Ba2YCu3O6.15 gives a nominal composition of Ba2YCu3O4.7F3.0, which is not supercon ducting to 4.2 K. Fluorinated pellets appear to be single-phase as determined by X-ray powder diffraction. However, Raman, NQR, ESR, X-ray diffraction, and TEM data suggest that fluorine is not incorporated into the superconducting phase, but rather is incorporated into a secondary amorphous phase.

Original languageEnglish (US)
Pages (from-to)1104-1108
Number of pages5
JournalSolid State Ionics
Volume32-33
Issue numberPART 2
DOIs
StatePublished - 1989

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics

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