Oxidation of cobalt at high temperature

Mrowec, S.; Przybylski, K.

doi:10.1007/bf00608018

Cited by 44 publications

(31 citation statements)

References 9 publications

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“…8 are higher than the extrapolation from Mrowec and Prybylski. 15 The curves extrapolated from Mrowec and Prybylski 15 somewhat agree with the experimental data, with the main difference being slower initial oxidation for the experimental data.…”

Section: Resultssupporting

confidence: 55%

“…This non-parabolic behavior could be due to inaccuracies in the measurement of small scale thicknesses at short exposure times. The standard deviations of scale thickness values after short durations (Table 2) 15 were extrapolated down to 900°C (from 950°C-1300°C) and shown in Fig. 9.…”

Section: Resultsmentioning

confidence: 99%

“…The lowest solid line is the isothermal scale thicknesses at 900°C extrapolated from Mrowec and Prybyski. 15 …”

Section: Discussionmentioning

confidence: 99%

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Effects of Temperature Gradients and Heat Fluxes on High-Temperature Oxidation

Holcomb

2008

Oxid Met

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The effects of a temperature gradient and heat flux on point defect diffusion in protective oxide scales were examined. Irreversible thermodynamics were used to expand Fick's first law of diffusion to include a heat flux term-a Soret effect. Oxidation kinetics were developed for the oxidation of cobalt and of nickel doped with chromium. Research is described to verify the effects of a heat flux by oxidizing pure cobalt in a temperature gradient at 900ºC, and comparing the kinetics to isothermal oxidation. No evidence of a heat flux effect was found.

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Section: Resultssupporting

confidence: 55%

Section: Resultsmentioning

confidence: 99%

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Effects of Temperature Gradients and Heat Fluxes on High-Temperature Oxidation

Holcomb

2008

Oxid Met

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“…Since cobalt is 4 the major component in one class of superalloys, its high-temperature oxidation and sulfidation have been well studied (16,17). It is known that oxidation and sulfidation of bulk cobalt under vapor at high temperature is mainly controlled by outward diffusion of cobalt cations (18).…”

mentioning

confidence: 99%

Formation of Hollow Nanocrystals Through the Nanoscale Kirkendall Effect

Yin

Rioux

Erdonmez

et al. 2004

Science

3,350

2,601

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We demonstrate that hollow nanocrystals can be synthesized through a mechanism analogous to the Kirkendall Effect, in which pores form due to the difference in diffusion rates between two components in a diffusion couple. Cobalt nanocrystals are chosen as a primary example to show that their reaction in solution with oxygen, sulfur or selenium leads to the formation of hollow nanocrystals of the resulting oxide and chalcogenides. This process provides a general route to the synthesis of hollow nanostructures of large numbers of compounds. A simple extension of this process yields platinum-cobalt oxide yolk-shell nanostructures which may serve as nanoscale reactors in catalytic applications.

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“…From the studies on the chemical diffusion [6,12,13,17,23,27,28,32,[47][48][49][50][51][52][53][54][55] and cobalt self-diffusion [3,16,[56][57][58][59], mostly performed at higher oxygen pressures, it transpires that the matter transport occurs mainly via single-ionized cobalt vacancies. A similar conclusion can be derived from the relation between the defect concentration, the diffusion coefficients, and the parabolic rate constants of cobalt oxidation [60][61][62][63][64]. However, it has been concluded that the total concentration of cobalt vacancies is higher than that resulting from the studies on the deviation from the stoichiometry [14,64].…”

mentioning

confidence: 63%

Point defect diagrams for pure and doped cobalt oxide $$ {\hbox{C}}{{\hbox{o}}_{{{1} - }}}_{\delta }{\hbox{O}} $$ in the temperature range of 1,173–1,673 K (I)

Stokłosa

2011

Ionics

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The point defect diagram in non-stoichiometric cobalt oxide Co 1Àd O, pure and doped with M 3+ and M + metal ions, taking into consideration all of the types of defects in the cation sublattice are presented in this work. A new method was used for the calculations of the diagrams. This method is based on the derived relations between the standard Gibbs energies of formation of cobalt vacancies and the intrinsic ionic and electronic defects; it also uses the experimental values of the deviation from the stoichiometry. The calculations were performed using the results of studies obtained by many authors in the temperature range of 1,173-1,673 K.

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Oxidation of cobalt at high temperature

Cited by 44 publications

References 9 publications

Effects of Temperature Gradients and Heat Fluxes on High-Temperature Oxidation

Effects of Temperature Gradients and Heat Fluxes on High-Temperature Oxidation

Formation of Hollow Nanocrystals Through the Nanoscale Kirkendall Effect

Point defect diagrams for pure and doped cobalt oxide $$ {\hbox{C}}{{\hbox{o}}_{{{1} - }}}_{\delta }{\hbox{O}} $$ in the temperature range of 1,173–1,673 K (I)

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