6533b7ddfe1ef96bd1273681
RESEARCH PRODUCT
Characterization of the Solid State Properties of Anodic Oxides on Magnetron Sputtered Ta, Nb and Ta-Nb Alloys
F. Di FrancoMonica SantamariaGiorgia ZampardiF. Di QuartoHiroki Habazakisubject
431Materials scienceRenewable Energy Sustainability and the EnvironmentSolid-stateCondensed Matter PhysicsSolid State Properties Anodic Oxides Ta-Nb AlloysSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsCharacterization (materials science)AnodeSettore ING-IND/23 - Chimica Fisica ApplicataChemical engineeringCavity magnetronMaterials ChemistryElectrochemistrydescription
Tantalum oxide, niobium oxide and Ta-Nb containing mixed oxides were grown by anodizing sputter-deposited Ta, Nb and Ta-Nb alloys of different compositions. A photoelectrochemical investigation was performed in order to estimate the band gap and the flat band potential of the oxides as a function of their composition. The band gap of the investigated Ta-Nb containing mixed oxides changed monotonically between those estimated for Ta2O5 (4.1 eV) and Nb2O5 (3.4 eV) and in agreement with a proposed correlation between the Band gap of an oxide and the difference of electronegativity of the oxide constituents. From the differential capacitance curves recorded in a wide range of electrode potential and for several frequencies of the alternative signal, the dielectric constant of the investigated oxides were estimated.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-01-01 |