Effect of the current density on the volume expansion of the deposited thin films of aluminum during porous oxide formation

Vrublevsky, Igor; Parkoun, V.; Schreckenbach, J.; Marx, G.

doi:10.1016/s0169-4332(03)00747-5

Cited by 60 publications

(48 citation statements)

References 15 publications

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“…The influence of anodizing potential on the volume expansion factor was studied by Vrublevsky et al [247,404,405], for the anodization of aluminum conducted under a constant current density. Measurements were performed using a mechanical profiler with a computer signal processing for oxalic and sulfuric acids, whereupon the PBR was found to be linearly dependent on the anodizing potential (Table 1.…”

Section: Volume Expansion: the Pilling-bedworth Ratio (Pbr)mentioning

confidence: 99%

Highly Ordered Anodic Porous Alumina Formation by Self‐Organized Anodizing

Sulka

2008

Nanostructured Materials in Electrochemistry

236

298

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Section: Volume Expansion: the Pilling-bedworth Ratio (Pbr)mentioning

confidence: 99%

Highly Ordered Anodic Porous Alumina Formation by Self‐Organized Anodizing

Sulka

2008

Nanostructured Materials in Electrochemistry

236

298

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“…Anodic oxidation of aluminum is a volume expansion process, and thus accompanied by compressive stress along the metal/oxide film interface which was found to play a role in the self-ordering of oxide nanopores. [45,46] Since volume expansion factor is proportional to the current density j, [15,47,48] a very high level of stress can be expected during large oscillations of current. We believe that a consequence of nonuniform intense mechanical stresses at the metal/oxide interface is plastic deformation of aluminum substrate and the observed distorted pore channels in the anodic oxide film.…”

Section: Local Heat Developmentmentioning

confidence: 99%

Spontaneous Current Oscillations during Hard Anodization of Aluminum under Potentiostatic Conditions

Lee

Kim

Gösele

2009

Adv Funct Materials

148

106

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Nanoporous anodic aluminum oxide is prepared by hard anodization of aluminum under potentiostatic conditions using 0.3 M H2C2O4. Under unstirred electrolyte condition, spontaneous current oscillations are observed. The amplitude and period of these current oscillations are observed to increase with anodization time. As a consequence of the oscillatory behavior, the resulting anodic alumina exhibits modulated pore structures, in which the diameter contrast and the length of pore modulation increase with the amplitude and the period of current oscillations, respectively, and the current peak profile determines the internal geometry of oxide nanopores. The mechanism responsible for the oscillatory behavior is suggested to be a diffusion‐controlled anodic oxidation of aluminum.

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“…The tracer studies supported earlier measurements of the rate of increase in pore wall height relative to stationary reference planes. [5][6][7] Both experiments revealed plastic flow in the pore walls at typical velocities of 0.1-1 nm/s. We developed a transport model of porous anodic alumina films, which validated the hypothesis of coupled electrical migration and viscous flow of oxide, through a detailed agreement with the tungsten tracer profiles.…”

mentioning

confidence: 92%

A Model for Coupled Electrical Migration and Stress-Driven Transport in Anodic Oxide Films

Hebert

Houser

2009

J. Electrochem. Soc.

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A model for transport in amorphous anodic oxide films was developed in which ion migration was driven by gradients of mechanical stress as well as electric potential and which included viscoelastic creep of the oxide. Simulations were presented for the galvanostatic growth of planar barrier-type anodic aluminum oxide films. It is assumed that stress originates at the metal-film interface due to the volume change upon oxidation. The average stress in the film decayed during growth and evolved from compressive to tensile with increasing applied current density. The model was fit to stress-thickness measurements using a viscosity of 1×1012Pas on the same order of magnitude as that of many other amorphous materials displaying viscous creep. The current density increased exponentially with electric field, in agreement with an empirical high field conduction behavior. The metal ion transport number was predicted based on the motion of markers in the film and increased with current density in quantitative agreement with experimental measurements. The model represents a unified quantitative interpretation of ionic conduction, transport numbers, and mechanical stress measurements in anodic films.

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Effect of the current density on the volume expansion of the deposited thin films of aluminum during porous oxide formation

Cited by 60 publications

References 15 publications

Highly Ordered Anodic Porous Alumina Formation by Self‐Organized Anodizing

Highly Ordered Anodic Porous Alumina Formation by Self‐Organized Anodizing

Spontaneous Current Oscillations during Hard Anodization of Aluminum under Potentiostatic Conditions

A Model for Coupled Electrical Migration and Stress-Driven Transport in Anodic Oxide Films

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