0000000000134131

AUTHOR

Sandra Helena Pulcinelli

showing 4 related works from this author

New insights for materials science characterisation using different complementary techniques combined with X-ray absorption Spectroscopy

2005

The combination of x-ray absorption spectroscopy (XAS) with UV-Vis and Raman spectroscopies or with Differential Scanning Calorimetry (DSC) has been recently carried out on the D44 beamline of DCI-LURE. The different set-ups used to perform such combinations are described and examples of combined investigations belonging to different field of materials science (coordination chemistry, sol-gel and catalysis) are presented.

chemistry.chemical_classificationX-ray absorption spectroscopyMaterials scienceAbsorption spectroscopyField (physics)Analytical chemistryCondensed Matter PhysicsAtomic and Molecular Physics and OpticsCatalysisCoordination complexsymbols.namesakeDifferential scanning calorimetryBeamlinechemistrysymbolsRaman spectroscopyMathematical Physics
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Study on the initial stages of water corrosion of fluorozirconate glasses

2004

Abstract The surface corrosion process associated with the hydrolysis of fluorozirconate glass, ZBLAN (53ZrF 4 , 20BaF 2 , 20NaF, 4LaF 2 , 3AlF 3 ) was investigated using X-ray photoelectron spectroscopy (XPS), grazing-incidence small angle X-ray scattering (GISAXS), X-ray reflectivity (XRR) and scanning electron microscopy (SEM). After a short exposure period (25 min) of the glass surface to deionized water the XPS data indicate an increase of the oxygen content accompanied by a decrease of fluorine concentration. The analysis of the chemical bonding structure identified the predominant surface reaction products as zirconium hydroxyfluoride and oxyfluoride species. The second most abundant…

ZirconiumChemistryScanning electron microscopeSmall-angle X-ray scatteringAnalytical chemistryMineralogychemistry.chemical_elementCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsCorrosionX-ray reflectivityX-ray photoelectron spectroscopyMaterials ChemistryCeramics and CompositesGrazing-incidence small-angle scatteringDissolutionJournal of Non-Crystalline Solids
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Spectroscopic studies and crystal structure of bis(N-2-pyridinylcarbonyl-2-pyridinecarboximidato) manganese(II) monohydrate: Zero-field splitting par…

1990

Abstract The X-ray crystal structure of bis(N-2-pyridinylcarbonyl-2-pyridinecarboximidato)manganese(II) monohydrate, Mn(BPCA)2·H2O, has been determine

chemistry.chemical_classificationInorganic chemistrychemistry.chemical_elementManganeseCrystal structureZero field splittingInorganic Chemistrychemistry.chemical_compoundCrystallographychemistryX-ray crystallographyMaterials ChemistryMoleculePhysical and Theoretical ChemistryImideHydrateInorganic compoundPolyhedron
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Densification of MnDoped Tin Oxide Films by Conventional Heating and Microwave Heating Treatment

2005

Mn(II) doped SnO2 thin films used for shielding fluoride glasses against corrosion were investigated by x-ray absorption spectroscopy (EXAFS and XANE)S at the Sn and Mn K-edges. The effect of firing treatment on the densification of the films was studied. It has been evidenced a partial change of Mn valence from 2.3 to 2.6 upon heating which is attributed to a change of ratios of two Mn sites: grafted divalent Mn ions at the surface of SnO2 nanocrystallites and trivalent Mn ions embedded into a substitutional solid solution with Sn.

Materials scienceExtended X-ray absorption fine structureAbsorption spectroscopyTin dioxideInorganic chemistryDopingchemistry.chemical_elementManganeseCondensed Matter PhysicsTin oxideAtomic and Molecular Physics and Opticschemistry.chemical_compoundchemistryThin filmMathematical PhysicsSolid solutionPhysica Scripta
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