An interesting sol-gel route to prepare oxyfluoride Sr2CuO2F2+δ superconductors

Shinobu Fujihara, Y. Masuda, J. S. Jin, T. Kimura, K. Tanabe

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The oxyfluoride superconductor, Sr2CuO2F2+δ, was prepared by a sol-gel method. Two different routes were examined; one was an attempt to prepare the Sr2CuO2F2+δ phase directly from fluorine-containing sols, and the other was the fluorination of sol-gel-derived Sr2CuO3 fine powders by F2 gas. The former route did not lead to the formation of oxyfluorides because of the precipitation of SrF2 by the heat treatments of the gel. The latter route led to the formation of the Sr2CuO2F2+δ phase. The amount of the Sr2CuO2F2+δ phase and superconducting properties of the powders depended on the fluorinating condition such as F2 gas concentration and fluorinating time. The Tc values reached 45-47 K by annealing the fluorinated samples in vacuo. The magnetization hysteresis loop was measured for the first time in the oxyfluoride superconductors.

Original languageEnglish
Pages (from-to)63-69
Number of pages7
JournalPhysica C: Superconductivity and its Applications
Volume290
Issue number1-2
Publication statusPublished - 1997 Oct 15

Fingerprint

oxyfluorides
Superconducting materials
Sol-gels
routes
gels
Powders
Fluorination
Hysteresis loops
Sols
Gases
Fluorine
Sol-gel process
Magnetization
fluorination
Gels
Heat treatment
Polymethyl Methacrylate
Annealing
gases
fluorine

Keywords

  • Magnetization
  • Oxyfluoride superconductor
  • Sol-gel
  • SrCuOF
  • SrCuO

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

An interesting sol-gel route to prepare oxyfluoride Sr2CuO2F2+δ superconductors. / Fujihara, Shinobu; Masuda, Y.; Jin, J. S.; Kimura, T.; Tanabe, K.

In: Physica C: Superconductivity and its Applications, Vol. 290, No. 1-2, 15.10.1997, p. 63-69.

Research output: Contribution to journalArticle

Fujihara, Shinobu ; Masuda, Y. ; Jin, J. S. ; Kimura, T. ; Tanabe, K. / An interesting sol-gel route to prepare oxyfluoride Sr2CuO2F2+δ superconductors. In: Physica C: Superconductivity and its Applications. 1997 ; Vol. 290, No. 1-2. pp. 63-69.
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