0000000000007270

AUTHOR

Andres Sotelo

showing 3 related works from this author

Ag/(Bi, Pb)-Sr-Ca-Cu-O superconducting tape processing: Solid state chemistry aspects

1993

Abstract Different preparation methods have been used to obtain starting powders used in the fabrication of composite tapes by the powder-in-tube method. The effect of these distinct starting powders on the superconducting properties of Ag/Bi-Sr-Ca-Cu-O monofilament tapes has been investigated. The changes in the physical properties, including the critical current density at 77 K and ac magnetic susceptibility, and microstructure, using optical and electronic microscopy, have been analyzed in relation to the solid state reactions involved in the Bi 2 Sr 2 CaCu 2 O 8+δ and Bi 2 Sr 2 Ca 2 Cu 3 O 10+δ phase transformations.

SuperconductivitySolid-state chemistryMaterials scienceFabricationInorganic chemistryComposite numberAnalytical chemistryGeneral ChemistryCondensed Matter PhysicsMicrostructureMagnetic susceptibilityPhase (matter)General Materials ScienceCritical currentSolid State Ionics
researchProduct

Polymer solution processing of (Bi, Pb)SrCaCuO

1991

Abstract A simple polymer processing route to the 110 K phase (Bi, Pb) 2 Sr 2 Ca 2 Cu 3 O 10+δ superconductor has been developed. The influence of the polymer to metal starting ratio, as well as the sintering temperature and time on the quality of the resulting superconducting powders has been studied by XRD, a.c. susceptibility and resistivity measurements. Microstructure of ceramic compacts has been studied by SEM, and qualitatively analysed by EDS for compositional homogeneity. The results indicate that the polymer synthesis route described here may offer a good alternative to the conventional solid state preparation methods towards attaining homogeneous 110 K superconductor powder withi…

Superconductivitychemistry.chemical_classificationMaterials scienceAnalytical chemistryEnergy Engineering and Power TechnologySinteringPolymerCondensed Matter PhysicsMicrostructureElectronic Optical and Magnetic MaterialsMetalchemistryElectrical resistivity and conductivityvisual_artHomogeneity (physics)visual_art.visual_art_mediumCeramicElectrical and Electronic Engineering
researchProduct

(Bi,Pb)2Sr2Ca2Cu3O10+δ superconductor composites: Ceramics vs. fibers

1991

Abstract Well characterized (Bi, Pb) 2 Sr 2 Ca 2 Cu 3 O 10+δ superconductor powder has been used to prepare superconductor-glass, -metal and -alloy composites through solid state reaction method. A recently developed Laser Floating Zone (LFZ) apparatus has been used to transform the ceramic precursors into oriented fibers. The diamagnetic properties have been studied by a.c. susceptibility. The microstructure of fibers has been studied by SEM and compared with that of the original ceramic precursors. XRD has been used to study phase composition on representative composite samples and fibers. The results indicate some potential for the 2223-Ag composite, which displays improved diamagnetic p…

SuperconductivityMaterials scienceComposite numberAlloyEnergy Engineering and Power Technologyengineering.materialCondensed Matter PhysicsMicrostructureElectronic Optical and Magnetic MaterialsMetalvisual_artvisual_art.visual_art_mediumengineeringDiamagnetismCeramicFiberElectrical and Electronic EngineeringComposite materialPhysica C: Superconductivity
researchProduct