Oxidation of Silver by Atomic Oxygen

Zheludkevich, Mikhail L.; Gusakov, A. G.; Voropaev, A. G.; Vecher, A.A.; Kozyrski, E.N.; Raspopov, S.A.

doi:10.1023/b:oxid.0000016275.96500.24

Cited by 64 publications

(59 citation statements)

References 6 publications

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“…In this figure, it can be observed that as the temperature increases further, the oxidation rate increases. This behavior is similar to that found for the interaction of silver [10] and copper [12] and with atomic oxygen. In the DOPA sample, k was calculated using the experimental values determined below 60% of the complete oxidation of the Zn, since Eq.…”

Section: Resultssupporting

confidence: 87%

“…Oxygen atoms (or zinc atoms) diffuse through the dense oxide layer; the thickness of the layer increases with time. It may be considered an initial linear stage, because it takes a substantial time before all the metal becomes coated with an oxide film, as observed by Zheludkevich et al [10] in the oxidation of silver by atomic oxygen. These authors pointed out that linear kinetics indicate that the rate-limiting step is the reaction at the surface of the particles.…”

Section: Resultsmentioning

confidence: 95%

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Complete Oxidation of Zinc Powder. Validation of Kinetics Models

Garcı́a¹,

Sánchez²,

Metz³

2008

Oxid Met

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The kinetics of complete oxidation of different samples of zinc powder by air has been investigated by thermogravimetric measurements under isothermal conditions in the range 973-1,173 K. Particles size was in the 63-80 lm range. We succeeded in carrying out the full oxidation of the powders far above the zinc-metal melting point (692.6 K). This phenomenon is linked to the presence of a thin ZnO layer which confines the liquid metal during the oxidation process. Two kinetics models have been verified. The apparent activation energies obtained from the Arrhenius law were 128 kJ mol -1 and 129 kJ mol -1 , respectively.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 95%

Complete Oxidation of Zinc Powder. Validation of Kinetics Models

Garcı́a¹,

Sánchez²,

Metz³

2008

Oxid Met

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“…Figure 7͑a͒ illustrates the oxygen pressure effect on the oxidation kinetics at 300 K. Kinetics are faster for larger oxygen pressure, as expected. Zheludkevich et al 42 have seen the same effect for silver oxidation at 523 K by varying the value of the flux of atomic oxygen. The curves in Fig.…”

Section: Oxide Growth Kineticsmentioning

confidence: 70%

Nanoscale oxide growth on Al single crystals at low temperatures: Variable charge molecular dynamics simulations

et al. 2006

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We investigate the oxidation of aluminum low-index surfaces ͓͑100͒, ͑110͒, and ͑111͔͒ at low temperatures ͑300-600 K͒ and three different gas pressure values. We use molecular dynamics ͑MD͒ simulations with dynamic charge transfer between atoms where the interaction between atoms is described by the Es+ potential composed of the embedded atom method ͑EAM͒ potential and an electrostatic contribution. In the considered temperature range and under different gas pressure conditions, the growth kinetics follow a direct logarithmic law where the oxide thickness is limited to a value of ϳ3 nm. The fitted curves allow us to determine the temperature and the pressure dependencies of the parameters involved in the growth law. During the adsorption stage, we observe a rotation of the oxygen pair as a precursor process to its dissociation. In most cases, the rotation aligns the molecule vertically to the Al surface. The separation distance after dissociation ranges from 3 to 9 Å. Atomistic observations revealed that the oxide presents a dominant tetrahedral ͑AlO 4 ͒ environment in the inner layer and mixed tetrahedral and octahedral ͑AlO 6 ͒ environments in the outer oxide region when the oxide thickness reaches values beyond ϳ2 nm.

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“…For example, the oxidation of silver by atomic oxygen occurs even at low pressures, whereas molecular oxygen does not oxidize metallic silver even under high pressures and temperatures. 1,2 The oxidation rate of nickel and copper in atomic oxygen exceeds that in molecular oxygen by several orders of magnitude. 3 The most important and widely used construction materials are iron and steels of various compositions.…”

Section: Introductionmentioning

confidence: 99%

Influence of Oxygen Dissociation on the Oxidation of Iron

Zheludkevich

Gusakov

Voropaev

et al. 2004

Oxidation of Metals

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Kinetics of the oxidation of iron in fluxes of atomic and molecular oxygen have been studied over a wide temperature range from 573 to 1273 K. The influence of oxygen pre-dissociation on the oxidation rate was found negligible at 573-1073 K. At temperatures above 1073 K, when only FeO is formed, the rate of iron oxidation in atomic oxygen is substantially higher than that in molecular oxygen. Decarburization occurs during the first stage of oxidation of iron containing carbon. The rate of carbon elimination in atomic oxygen exceeds that in molecular oxygen due to the higher chemical potential of atomic gas.

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Oxidation of Silver by Atomic Oxygen

Cited by 64 publications

References 6 publications

Complete Oxidation of Zinc Powder. Validation of Kinetics Models

Complete Oxidation of Zinc Powder. Validation of Kinetics Models

Nanoscale oxide growth on Al single crystals at low temperatures: Variable charge molecular dynamics simulations

Influence of Oxygen Dissociation on the Oxidation of Iron

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