Substitution of Cu by Fe in the superconducting ceramic oxide EuBa sub 2 Cu sub 3 O sub y : Structure, electrical conductivity, and microwave response

Journal Article · Thu Jun 01 04:00:00 EDT 1989 · Journal of Superconductivity; (USA)

DOI:https://doi.org/10.1007/BF00617881· OSTI ID:5525209

Phillips, T E; Bohandy, J; Moorjani, K ^[1]

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1. Johns Hopkins Univ., Laurel, MD (USA)

A series of EuBa{sub 2}(Cu{sub 1{minus}x}Fe{sub x}){sub 3}O{sub y} (0.0 {<=} x {<=} 0.15) ceramics were prepared and examined by thermogravimetric analysis, X-ray powder diffraction, electrical resistance measurements, and a magnetically modulated microwave absorption technique. The oxygen content (y = 6.98 {plus minus} 0.03), determined by thermogravimetric analysis in a reducing atmosphere, was independent of the iron concentration for x {<=} 0.12. The introduction of iron into the EuBa{sub 2}Cu{sub 3}O{sub y} lattice, via substitution into copper sites, effects a progressive decrease in the superconducting transition temperature with increasing iron concentration. Normal-state conductivity similarly progresses from a low resistivity and negative temperature coefficient behavior, to a semiconducting-like response at the high iron concentrations. X-ray powder diffraction measurements indicate that material containing 6% iron and above is tetragonal, yet it remains superconducting with up to at least 12% iron.

• OSTI ID: 5525209
• Journal Information: Journal of Superconductivity; (USA), Journal Name: Journal of Superconductivity; (USA) Vol. 2:2; ISSN 0896-1107; ISSN JOUSE
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
&amp; Refractories-- Structure &amp; Phase Studies
360204 -- Ceramics
Cermets
&amp; Refractories-- Physical Properties
ABSORPTION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL DOPING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
CRYSTALLOGRAPHY
DIFFRACTION
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ELEMENTS
EUROPIUM COMPOUNDS
EUROPIUM OXIDES
GRAVIMETRIC ANALYSIS
IRON
LATTICE PARAMETERS
MATERIALS
METALLURGICAL EFFECTS
METALS
MICROSTRUCTURE
MICROWAVE RADIATION
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
QUANTITATIVE CHEMICAL ANALYSIS
QUANTITY RATIO
RADIATIONS
RARE EARTH COMPOUNDS
SCATTERING
STOICHIOMETRY
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TETRAGONAL LATTICES
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION