Crystallization in anodic oxide films

Leach, Joan; Pearson, B.R.

doi:10.1016/0010-938x(88)90005-4

Cited by 135 publications

(58 citation statements)

References 34 publications

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“…For all the samples, the potential sweep in positive direction shows an anodic current starting at negative potential that corresponds to the formation of titanium oxides [49][50][51][52]. Figure 6 shows typical SEM images of the resulting surface oxide films after anodic polarization in mouthwash solution for Ti12Mo and Ti40Mo alloys.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Effect of Mo content on electrochemical behaviour of TiMo alloys for dental applications

Mareci¹,

Chelariu²,

Gordin³

et al. 2010

Materials & Corrosion

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Section: Electrochemical Measurementsmentioning

confidence: 99%

Effect of Mo content on electrochemical behaviour of TiMo alloys for dental applications

Mareci¹,

Chelariu²,

Gordin³

et al. 2010

Materials & Corrosion

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“…Zirconium oxide incorporates anions from the electrolyte when anodically formed [12 -17], and during oxide growth, the current transport is due entirely to O 2À ion migration [18,19]. Whereas the majority of valve metal oxides are amorphous, thick zirconium oxide films are crystalline [20]. Beside polarization, electrochemical impedance spectroscopy, (EIS) [21], is an important analysis technique of electrochemical measurements where the impedance of the corroding interface is measured over a wide range of frequencies [22].…”

Section: Introductionmentioning

confidence: 99%

Corrosion behaviour of zirconium electrode in sodium azide electrolyte as compared to the alkali halide solutions

Ghoneim

2004

Materials & Corrosion

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The kinetics of open circuit growth of an oxide film on zirconium electrode in NaN 3 solution of various concentrations was investigated using potential and capacitance measurements. The protective oxide film formed in azide solutions was found to thicken with time in two steps, the rate of oxide growth was found to decrease as the azide concentration increased. The corrosion behaviour of the electrode was characterized by ac impedance measurements to obtain detailed information about the effect of azide ion concentration on the electrical properties of the Zr electrode surface. The impedance response for the metal-metal oxide-electrolyte system was modeled with a transfer function. The potentiodynamic oxidation of Zr was also studied as a function of the azide ion concentration. The polarization curves showed the peak-shaped activeto-passive transition and the corrosion rate was found to increase with increase of azide ion concentration. The activation energy of corrosion was calculated according to Arrhenius plot and found to be 14.5 kJ mol À1 . The polarization results in azide solutions were compared to those obtained in solutions of different halide ions, namely, F À , Cl À , Br À and I À ions. The rate of corrosion was found to decrease in the order Br À > Cl À > F À , I À > azide. Opposite to the behaviour in azide solutions, the halide ions do not show the activepassive transition.

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“…7a, this produced much larger protrusions (average diameter of *6 lm) that were surrounded by ATO that peeled away from the cracked protrusions. This type of behavior has been observed in numerous previous studies [1,2,20]. A cross-sectional FIB-cut slab of this region (black rectangle in Fig.…”

Section: Resultsmentioning

confidence: 52%

“…These observation techniques are not precise enough to provide insight into the early onset of crystallization in the ATO [19]. Hence, the factors which initiate the crystallization process are still controversial [20].…”

Section: Introductionmentioning

confidence: 99%

Reassessment of degradation mechanisms in anodic tantalum oxide capacitors under high electric fields

Viste

Hossick-Schott

et al. 2014

J Mater Sci

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High-voltage Ta capacitors have broad applications in various electric systems. Anodically grown, amorphous tantalum oxide (ATO) serves as the dielectric in these capacitors. A detailed understanding of the behavior of ATO exposed to high electric fields is highly desirable and is reflected in a number of prior investigations into this subject. In the conventional view, the electric field promotes the growth of crystalline oxide, which is electrically more conductive and thus leads to the degradation of the dielectric. This interpretation is re-examined using several advanced characterization techniques. The results indicate that oxidation of the ATO and underlying Ta occurs preferentially at specific locations. Subsequent crystallization at these sites was only observed in specimens where this enhanced oxidation led to cracking in the ATO. The results with different Ta materials indicate that these cracks are more prevalent with rougher surfaces. The reported sequence of mechanisms that leads to crystallization provides new insight that can potentially be employed to improve the reliability and stability of Ta capacitors.

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Crystallization in anodic oxide films

Cited by 135 publications

References 34 publications

Effect of Mo content on electrochemical behaviour of TiMo alloys for dental applications

Effect of Mo content on electrochemical behaviour of TiMo alloys for dental applications

Corrosion behaviour of zirconium electrode in sodium azide electrolyte as compared to the alkali halide solutions

Reassessment of degradation mechanisms in anodic tantalum oxide capacitors under high electric fields

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