Search results for "TA2O5"

showing 3 items of 3 documents

Effect of Composition on the Photoelectrochemical Behavior of Anodic Oxides on Binary Aluminum Alloys

2006

The photoelectrochemical behavior of anodic films on Al alloys, containing titanium, tantalum, and tungsten (valve metals), has been studied as a function of alloy composition and anodizing conditions. Photocurrent spectroscopy has been used to get information on bandgap and the flatband potential values of different mixed oxides. Both insulator-like and semiconducting behavior has been observed for anodic oxides grown on Al-W and Al-Ti alloys dependent on alloy initial composition. Optical bandgap values, E opt g , of different oxides are in accordance with predictions based on the correlation between E opt g and the difference of electronegativities of the oxide constituents, indicating p…

PASSIVE FILMSMaterials scienceAlloyOxideTantalumchemistry.chemical_elementTungstenengineering.materialchemistry.chemical_compoundWO3Materials ChemistryElectrochemistryPHOTOEMISSION PROCESSESDEPOSITIONPhotocurrentSPECTROSCOPYRenewable Energy Sustainability and the EnvironmentAnodizingFILM FORMATIONMetallurgyIONIC TRANSPORTCORROSIONCondensed Matter PhysicsTA2O5Surfaces Coatings and FilmsElectronic Optical and Magnetic MaterialschemistryChemical engineeringengineeringPHOTOEMISSION PROCESSES; IONIC TRANSPORT; FILM FORMATION; PASSIVE FILMS; CORROSION; TA2O5; WO3; CRYSTALLIZATION; SPECTROSCOPY; DEPOSITIONCRYSTALLIZATIONTernary operationTitaniumJournal of The Electrochemical Society
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Photoelectrochemical Synthesis of Conducting Polymers on Large Band Gap Nb2O5 and Ta2O5 Anodic Oxide Films

2008

Photoelectrochemical Synthesis Conducting Polymers Nb2O5 Ta2O5 Anodic Oxide Films
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The influence of nitrogen incorporation on the optical properties of anodic Ta2O5

2012

Abstract Anodic oxides were grown on sputter-deposited Ta in different aqueous solutions. A photoelectrochemical investigation was performed in order to estimate the band gap of the films as a function of the anodizing bath composition and formation voltage, i.e. thickness. Photoelectrochemical results provided evidence of sub-band gap photocurrent for films formed in a bath containing ammonium ions at pH 9. Elemental depth profiles obtained by glow discharge optical emission spectroscopy revealed the presence of nitrogen species in the outer part of the anodic films, which is bonded to Ta according to XPS analysis. A mechanism of nitrogen incorporation is proposed in order to account for t…

PhotocurrentAqueous solutionMaterials scienceBand gapAnodizingGeneral Chemical EngineeringInorganic chemistryAnalytical chemistrychemistry.chemical_elementNitrogenAnodeIonNitrogen Incorporation Optical Properties Anodic Ta2O5Settore ING-IND/23 - Chimica Fisica ApplicatachemistryX-ray photoelectron spectroscopyElectrochemistryElectrochimica Acta
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