0000000000007277

AUTHOR

A. Beltran

showing 3 related works from this author

(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
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Transition metal derivatives of low oxidation state phosphorus oxoacids: synthetic pathways and structural studies

1993

Abstract A general synthetic approach intended to rationalize the solution preparative chemistry of transition metal phosphites and hypophosphites is presented. As previously shown for other derivatives containing also tetrahedral or pseudotetrahedral oxoanions, the hydrolytic processes affecting the cationic moieties play a determinant role on the very nature of the final solid. In fact, despite the limited number of donor atoms in the anions, the crystal chemistry of these compounds is quite intricate because of both the variety of possible cationic aggregates and the many ways to interconnect them through pseudotetrahedral anionic groups.

ChemistryCrystal chemistryPhosphorusCationic polymerizationchemistry.chemical_elementGeneral ChemistryCondensed Matter PhysicsHydrolysisTransition metalOxidation stateComputational chemistryOrganic chemistryGeneral Materials ScienceA determinantSolid State Ionics
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ChemInform Abstract: Transition Metal Derivatives of Low Oxidation State Phosphorus Oxoacids: Synthetic Pathways and Structural Studies

2010

Abstract A general synthetic approach intended to rationalize the solution preparative chemistry of transition metal phosphites and hypophosphites is presented. As previously shown for other derivatives containing also tetrahedral or pseudotetrahedral oxoanions, the hydrolytic processes affecting the cationic moieties play a determinant role on the very nature of the final solid. In fact, despite the limited number of donor atoms in the anions, the crystal chemistry of these compounds is quite intricate because of both the variety of possible cationic aggregates and the many ways to interconnect them through pseudotetrahedral anionic groups.

HydrolysischemistryTransition metalComputational chemistryCrystal chemistryOxidation statePhosphorusCationic polymerizationchemistry.chemical_elementGeneral MedicineA determinantChemInform
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