Effect of WO sub 3 doping on the properties of YBa sub 2 Cu sub 3 O sub 7 minus x superconductor

Journal Article · Mon Jan 01 04:00:00 EST 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.345264· OSTI ID:7171489

Padam, G K; Tripathi, R B; Singh, S; Rao, S U.M.; Jain, K; Kotnala, R K; Goel, R C; Khurana, B S; Khullar, S M; Das, B K ^[1]

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1. National Physical Laboratory, New Delhi 110 012, India (IN)

Tungsten-doped YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} superconducting samples are characterized with the help of resistivity, crystal structural, microstructural, density {ital d}, and critical current density {ital J}{sub {ital c}} studies for doping concentrations varying from 0.00 to 0.14 mol % of WO{sub 3}. It has been found that doping of WO{sub 3} has hardly any influence of {ital T}{sub {ital c}}, whereas it seems that {ital d} and {ital J}{sub {ital c}} are affected. {ital d} and {ital J}{sub {ital c}} of the samples increase in the range 0{lt}WO{sub 3}{le}0.04, but above this range, both start decreasing. The maximum {ital J}{sub {ital c}} obtained at 77 K and zero magnetic field in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} doped with 0.04 mol % of WO{sub 3} is 450 A/cm{sup 2}. The lower concentrations ({lt}0.04 mol %) seem to improve the density, whereas higher concentrations lead to porous structure and also induce the formation of BaCuO{sub 2} and Y{sub 2}Ba{sub 1}Cu{sub 1}O{sub 5} nonsuperconducting phase as revealed by scanning electron microscopy, energy dispersive spectral, and x-ray diffraction analyses. The x-ray diffraction analysis also showed no appreciable change in the lattice parameters with WO{sub 3} doping. It appears that the WO{sub 3} doping changes the microstructure of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} to influence its {ital J}{sub {ital c}}.

• OSTI ID: 7171489
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 67:1; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
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
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CRYSTAL STRUCTURE
CURRENTS
DIFFRACTION
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
MATERIALS
MICROSCOPY
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
SCANNING ELECTRON MICROSCOPY
SCATTERING
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TUNGSTEN COMPOUNDS
TUNGSTEN OXIDES
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES