Title
A new way of synthesis and characterization of superconducting oxyfluoride <tex>$Sr_{2}Cu(O,F)_{4+\delta}$</tex> A new way of synthesis and characterization of superconducting oxyfluoride <tex>$Sr_{2}Cu(O,F)_{4+\delta}$</tex>
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Amsterdam ,
Subject
Physics
Source (journal)
Physica: C: superconductivity. - Amsterdam
Volume/pages
253(1995) :3/4 , p. 259-265
ISSN
0921-4534
ISI
A1995TE08400007
Carrier
E
Target language
English (eng)
Affiliation
University of Antwerp
Abstract
Superconducting Cu mixed oxyfluoride, Sr,Cu(O, F)(4+delta), was Obtained via fluorination of Sr2CuO3 by XeF2 in the 100-250 degrees C temperature range in a closed Ni container. The prepared samples exhibited a lower T-c in comparison with earlier reported values. Different samples in the Sr-Cu-O-F system were prepared by a solid-state reaction at 220-400 degrees C, but no formation of the oxyfluoride was detected even with an addition of xenon difluoride. These data allow one to draw conclusions on the metastability of the oxyfluoride under the conditions used, Electron microscopy and X-ray powder diffraction studies revealed large amounts of badly crystallized SrF2; this could be a reason for the small superconducting volume fraction as well as for the inhomogeneous distribution of the anions.
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