Dielectric properties of anodic oxide film on Nb solid solution/Nb ₂N two phase alloys

The structure and dielectric properties of an anodic oxide on Nb solid solution (Nb_ss)/Nb₂N two phase alloys were investigated. The anodized specimens were covered with two types of anodic oxides on the Nb_ss and Nb₂N phases, respectively. The relative permittivity and leakage current density of the anodized specimens can be explained by the combination of the two oxides; the relative permittivity of the specimens increased with the volume fraction of the oxide on the Nb _ss phase, because the relative permittivity of the oxide on the Nb_ss phase is higher than that on the Nb₂N phase. The leakage current was suppressed irrespective of the constitute phases as compared with the anodized pure Nb, because it was reduced in both the oxides on the Nb_ss and Nb₂N phases.