Chemical, structural, and electrical property studies on the fluorination of the 90 K superconductor YBa/sub 2/Cu/sub 3/O/sub 6. 8/

Journal Article · Wed Jan 13 04:00:00 EST 1988 · Inorg. Chem.; (United States)

DOI:https://doi.org/10.1021/ic00274a003· OSTI ID:5835845

Wang, H H; Kini, A M; Kao, H I; Appelman, E H; Thompson, A R; Botto, R E; Carlson, K D; Williams, J M; Chen, M Y; Schlueter, J A; Gates, B D

The effects of substitution of fluorine for part of the oxygen on the properties of the superconductor YBa/sub 2/Cu/sub 3/O/sub 6.8/ (YBCO) have been studies. A series of fluorine-containing materials with nominal composition YBa/sub 2/Cu/sub 3/F/sub x/O/sub 6.5-x/2/ (x = 1, 1.5, 2, 2.5, 3) was prepared by mixing YBa/sub 2/Cu/sub 3/O/sub 6.8/ and YBa/sub 5/Cu/sub 3/F/sub 4/O/sub 4.5/. The first three compositions exhibited superconducting transitions with onset temperatures from 75 to 49 K. X-ray powder patterns for all compositions showed the presence of unreacted BaF/sub 2/ which cast doubt on the actual fluorine incorporated into the complex. Several other unsuccessful attempts to incorporate fluorine are reported. The procedure using the reversible oxygen intercalation effect and reaction with F/sub 2/ to introduce fluorine into the 1:2:3 perovskite previously proved to be successful as indicated by x-ray diffraction patterns that showed a broad diffraction peak corresponding to the 1:2:3 YBCO perovskite structure with unresolved orthrhombic/tetragonal splittings and no indication of BaF/sub 2/. No evidence was found for a F-containing superconducting phase formed with T/sub c/ /approx equal/ 155 K. 21 refs., 3 figs., 1 tab.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5835845
• Journal Information: Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 27:1; ISSN INOCA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHEMICAL PREPARATION
COHERENT SCATTERING
COPPER COMPOUNDS
DATA
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
FLUORINE COMPOUNDS
HALOGEN COMPOUNDS
INFORMATION
NUMERICAL DATA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
SUPERCONDUCTIVITY
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS