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RESEARCH PRODUCT
Growth and Characterization of Anodic Films on Al-Nb Alloys
Monica SantamariaF. Di QuartoPeter SkeldonM. GentileG.e. Thompsonsubject
PhotocurrentMaterials scienceAnodizingBand gapMetallurgyNiobiumchemistry.chemical_elementPCS TEMElectrolyteAmorphous solidChemical engineeringchemistryAluminiumTransmission electron microscopydescription
Abstract The anodizing behaviours of sputtering-deposited aluminium, niobium and Al-Nb alloys, containing 0.4, 7.5, 21, 40 and 55 at.% niobium, have been examined in 0.1 M ammonium pentaborate electrolyte with interest in the morphology, structure and electronic properties of the anodic oxides. Transmission electron microscopy revealed amorphous oxides, containing units of Nb2O5 and Al2O3, with formation ratios intermediate between those of anodic alumina and anodic niobia. Photocurrent spectroscopy provided increased understanding of the electronic properties of the anodic films, suggesting the formation of “mixed oxides” with insulating behaviours. The estimated band gap values are correlated with film compositions through the electronegativites of the constituent species.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2006-01-01 |