Effect of fluoride doping on the transition temperature of YBa/sub 2/Cu/sub 3/O/sub 6. 5+//sub delta/

Journal Article · Mon Mar 07 04:00:00 EST 1988 · Appl. Phys. Lett.; (United States)

DOI:https://doi.org/10.1063/1.99301· OSTI ID:5418190

Bansal, N P; Sandkuhl, A L; Farrell, D E

The effect of fluoride doping on the superconducting transition temperature, T/sub c/, of YBa/sub 2/Cu/sub 3/O/sub 6.5+//sub delta/ has been investigated. Samples of nominal composition YBa/sub 2/Cu/sub 3/F/sub x/O/sub 6.5+//sub delta//sub -0.5//sub x/ were synthesized where x was varied by two orders of magnitude from 0.0165 to 1.65. T/sub c/ systematically increased with x, reached a maximum of 93.4 K (midpoint) for x = 0.066 and then dropped for higher concentrations. The sharpest transition, ..delta..T/sub c/(10--90%) = 0.7 +- 0.1 K, coincided with a maximum in T/sub c/. From powder x-ray diffraction measurements, samples with xless than or equal to0.066 were found to be single phase perovskite whereas those with xgreater than or equal to0.165 also contained BaF/sub 2/, CuO, and an unknown phase. Although we find no evidence for the very high T/sub c/'s reported by S. R. Ovshinsky, R. T. Young, D. D. Allred, G. DeMaggio, and G. A. Van der Leeden (Phys. Rev. Lett. 58, 2579 (1987)), our results do indicate that the effect of fluorine is qualitatively different from that produced by other dopants.

• Research Organization: Materials Division, National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135
• OSTI ID: 5418190
• Journal Information: Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 52:10; ISSN APPLA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL DOPING
CURRENT DENSITY
DATA
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
EXPERIMENTAL DATA
FABRICATION
FLUORINE
HALOGENS
INFORMATION
MATERIALS
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PHYSICAL PROPERTIES
SINTERING
SUPERCONDUCTORS
SYNTHESIS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VERY HIGH TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES