Anodic film on lead-arsenic alloy in sulphuric acid medium

Anodic film on lead-arsenic alloy in sulphuric acid medium

The phase composition, anodic behaviour and semiconducting properties of the anodic film on Pb-6 at.% As alloy have been investigated. The linear relationship between I and t exp 1/2 , where I is the anodizing current density and t the anodizing time, shows that the anodic film growth is controlled...

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Veröffentlicht in:Journal of applied electrochemistry 1994-09, Vol.24 (9), p.894-899
Hauptverfasser: XIA, S.-J, ZHOU, W.-F
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Sprache:eng
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Chemistry
Electrochemistry
Exact sciences and technology
General and physical chemistry
Kinetics and mechanism of reactions
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description The phase composition, anodic behaviour and semiconducting properties of the anodic film on Pb-6 at.% As alloy have been investigated. The linear relationship between I and t exp 1/2 , where I is the anodizing current density and t the anodizing time, shows that the anodic film growth is controlled by a diffusion mechanism. The experimental results show that the anodic film contains t-PbO, PbOmultPbSO sub 4 , 3PbOmultPbSO sub 4 and some As compounds. The dielectric constant of the film is 2.8x10 exp 2 obtained from the capitance-time relationship measured at 2500 Hz. The Mott-Schottky plot shows that the film is an n-type semiconductor. The flat-band potential is -0.56 V vs. Hg/Hg sub 2 SO sub 4 and the donor density is 7.2x10 exp 15 cm exp -3 for the film obtained at 0.9 V vs. Hg/Hg sub 2 SO sub 4 on a Pb-6 at.% As electrode.
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subjects Chemistry
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General and physical chemistry
Kinetics and mechanism of reactions
title Anodic film on lead-arsenic alloy in sulphuric acid medium
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