Intrinsic diffusion and vacancy wind effects in Ag-Cd alloys

Iorio, N.R.; Dayananda, M. A.; Grace, R. E.

doi:10.1007/bf02644530

Cited by 35 publications

(15 citation statements)

References 16 publications

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“…The outcome is somewhat confusing. Schmatz et al [15] and Irio et al [16] found that the Manning's correction led to a better match between the ratio of self diffusivities calculated from the Kirkendall effect and the ratio determined by radiotracer measurements. However, there was a significant disagreement in the absolute values of the self-diffusivities using both methods.…”

Section: Tracer Diffusion Coefficients and Vacancy Wind Effectmentioning

confidence: 96%

On diffusion in the β-NiAl phase

Paul

Kodentsov

Loo

2005

Journal of Alloys and Compounds

101

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Section: Tracer Diffusion Coefficients and Vacancy Wind Effectmentioning

confidence: 96%

On diffusion in the β-NiAl phase

Paul

Kodentsov

Loo

2005

Journal of Alloys and Compounds

101

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“…As an example of this, in Fig. 1(a) the authors show the ratio of the atom-vacancy exchange frequencies as deduced directly from the measured intrinsic diffusivities (Eq 11) in the Cd-Ag system at 873 K, [28] and in Fig. 1(b) the corresponding tracer correlation factors obtained from the ratio of the exchange frequencies by way of the diffusion kinetics theory of Moleko et al [13] It can be seen that at low Fig.…”

Section: Basic and Applied Research: Section Imentioning

confidence: 98%

Sum-rule relationships among phenomenological coefficients: Simplifications for the analysis of segregation and chemical diffusion

Belova

Murch

2005

J Phs Eqil and Diff

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In this review article, the authors first introduce the phenomenological transport coefficients, and the relationships between them and the tracer diffusion coefficients. Next, the authors discuss a sum rule relating phenomenological coefficients themselves in the random-alloy model. The authors then consider several applications of the sum rule to diffusion problems. These applications include intrinsic diffusion in multicomponent alloys, chemical diffusion in strongly ionic mixed cation crystals, and the segregation (demixing) of cations in mixed oxides in an oxygen potential gradient and/or an electric field. In each case, a substantial simplification is possible as a result of the sum rule.

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“…[29][30][31][32][33][34][35][36][37][38][39] However, some uncertainty exists because of difficulties associated with the experimental techniques. To shed light on this, we also have calculated the tracer diffusion coefficients after neglecting the contribution from the vacancy wind, which means that we consider W 5 1.…”

Section: B Impurity Diffusion Coefficientsmentioning

confidence: 99%

Interdiffusion and the vacancy wind effect in Ni–Pt and Co–Pt systems

2011

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In this study, bulk and multifoil diffusion couple experiments were conducted to examine the interdiffusion process in Ni-Pt and Co-Pt binary alloy systems. Inter-, intrinsic-, and tracer-diffusion coefficients at different temperatures, and as a function of the composition, were estimated by using the experimental data. Results show that in both the alloy systems, Pt is the slower diffusing species, and hence the interdiffusion process is controlled by either Ni or Co. The thermodynamic driving force makes the intrinsic diffusion coefficients of Co and Ni higher in the range of 30-70 at.%. The low activation energy for Co and Ni impurity diffusion in Pt compared with Pt in Ni and Co indicates that the size of the atoms plays an important role. The vacancy wind effects on the diffusion process are examined in detail, and it was demonstrated that its contribution falls within the experimental scatter and hence can be neglected.

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Intrinsic diffusion and vacancy wind effects in Ag-Cd alloys

Cited by 35 publications

References 16 publications

On diffusion in the β-NiAl phase

On diffusion in the β-NiAl phase

Sum-rule relationships among phenomenological coefficients: Simplifications for the analysis of segregation and chemical diffusion

Interdiffusion and the vacancy wind effect in Ni–Pt and Co–Pt systems

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