6533b872fe1ef96bd12d39f4

RESEARCH PRODUCT

Characterization of the Solid State Properties of Anodic Oxides on Ta-Nb Alloys as a Function of the Anodizing Conditions

Giorgia ZampardiMonica SantamariaFrancesco Di QuartoFrancesco Di-francoHiroki Habazaki

subject

Materials scienceSettore ING-IND/23 - Chimica Fisica ApplicataAnodizingMetallurgySolid-stateSolid State Properties Anodic OxidesTa-Nb Alloys Anodizing ConditionsFunction (mathematics)Solid State Properties Anodic Oxides Ta-Nb AlloysAnodeCharacterization (materials science)

description

Tantalum oxide, niobium oxide and Ta-Nb containing mixed oxides were grown by anodizing sputter-deposited TaxNb(1-x) alloys with 0 ≤ x ≤ 1. A photoelectrochemical investigation was performed in order to estimate the band gap values of the oxides as a function of their composition as well as to estimate their flat band potential. Differential capacitance curves were recorded for all the investigated oxides in a wide range of electrode potential and for several frequencies of the alternative signal. The dependence of C on the applied potential and a.c. frequency was interpreted on the basis of amorphous semiconductor Schottky barrier, and allowed to estimate the dielectric constant of the investigated oxides.

yearjournalcountryeditionlanguage
2011-01-01
http://hdl.handle.net/10447/64936