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Title: Electrochemical behaviour of niobium and niobium passive films in nitric acid solutions
Authors: Badawy, W A
AI-Kharafi, F M
Issue Date: Mar-1997
Publisher: NISCAIR-CSIR, India
Abstract: Electrochemical behaviour of bare niobium and phosphoric acid anodized niobium electrodes is investigated in nitric acid solutions. Electrochemical impedance spectroscopy and polarization techniques have been used to investigate the open-circuit growth of the passive film. The stability of the anodic oxide film has been studied as a function of the formation voltage, formation current density and concentration of the ambient electrolyte. The results show that the Nb-Nb2O5-1M HNO3 does not behave as a perfect dielectric. The flat band potential and donor concentration of the semiconducting anodic oxide film have been calculated from the Mott-Schottky plots.
Page(s): 94-100
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.04(2) [March 1997]

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