Determination of interdiffusion coefficients of Si and Al in Ti 3 SiC 2 –Ti 3 AlC 2 diffusion couple at 1373‐1673 K

2019 ◽  
Vol 103 (1) ◽  
pp. 670-680
Author(s):  
Zerong Zhang ◽  
Xiaohui Yin ◽  
Yuhai Qian ◽  
Jingjun Xu ◽  
Jun Zuo ◽  
...  
Keyword(s):  
Diffusion Couple ◽  
Interdiffusion Coefficients

On the Analysis of Composition Profiles in Binary Single-Phase Diffusion Couples: Systems with a Strong Compositional Dependence of the Interdiffusion Coefficient

2018 ◽  
Vol 383 ◽  
pp. 23-30 ◽  
Author(s):  
Bengü Tas Kavakbasi ◽  
Igor S. Golovin ◽  
Aloke Paul ◽  
Sergiy V. Divinski
Keyword(s):  
Diffusion Couple ◽  
Interdiffusion Coefficient ◽  
Chemical Diffusion ◽  
Compositional Dependence ◽  
New Approach ◽  
Correct Determination ◽  
Composition Profiles ◽  
Diffusion Couple Technique ◽  
Interdiffusion Coefficients

Diffusion couple technique is an efficient tool for the estimating the chemical diffusion coefficients. Typical experimental uncertainties of the composition profile measurements complicate a correct determination of the interdiffusion coefficients via the standard Boltzmann-Matano, Sauer-Freise or the den Broeder methods, especially for systems with a strong compositional dependence of the interdiffusion coefficient. A new approach for reliable fitting of the experimental profiles with an improved behavior at both ends of the diffusion couple is proposed and tested against the experimental data on chemical diffusion in the system Fe-Ga. An extension of the approach for reliable description of the up-hill diffusion phenomenon in multicomponent systems is presented.

Interdiffusion in Nb-Mo, Nb-Ti and Nb-Zr Systems

2012 ◽  
Vol 323-325 ◽  
pp. 491-496 ◽  
Author(s):  
Soma Prasad ◽  
Aloke Paul
Keyword(s):  
Activation Energy ◽  
Diffusion Coefficient ◽  
Diffusion Couple ◽  
Impurity Diffusion ◽  
Impurity Diffusion Coefficient ◽  
Different Temperatures ◽  
Diffusion Couple Technique ◽  
Interdiffusion Coefficients

Diffusion couple technique is used to study interdiffusion in Nb-Mo, Nb-Ti and Nb-Zr systems. Interdiffusion coefficients at different temperatures and compositions are determined using the relation developed by Wagner. The change in activation energy for interdiffusion with composition is determined. Further, impurity diffusion coefficient of the species are determined and compared with the available data in literature.

Coupled diffusion of butanol solubilized in aqueous sodium dodecylsulfate micelles

1990 ◽  
Vol 68 (1) ◽  
pp. 33-35 ◽  
Author(s):  
Derek G. Leaist
Keyword(s):  
Pure Water ◽  
Sodium Dodecylsulfate ◽  
Restricted Diffusion ◽  
Solution Viscosity ◽  
Diffusion Method ◽  
Coupled Flow ◽  
Aqueous Sodium ◽  
Coupled Diffusion ◽  
Interdiffusion Coefficients

Ternary interdiffusion coefficients have been measured for ten compositions of the system sodium dodecylsulfate (NaDS) + 1-butanol (BuOH) + water at 25 °C. The diffusivity of BuOH in this system is lower than in pure water because about one half of the alcohol is solubilized in the slowly-diffusing NaDS micelles. Yet, surprisingly, diffusion of the NaDS component transports only minor amounts of BuOH. Diffusion of the BuOH component, however, produces a substantial coupled flow of NaDS. Although added BuOH increases the solution viscosity and the size of the micelles, the diffusivity of the NaDS component does not change significantly. The Harned restricted diffusion method for the determination of electrolyte diffusivities is extended to electrolyte + nonelectrolyte solutes. Keywords: micelles, ionic; solubilization; diffusion, coupled.

Selected Analyses and Observations in Multicomponent Diffusion

2010 ◽  
Vol 297-301 ◽  
pp. 1451-1460 ◽  
Author(s):  
Mysore A. Dayananda
Keyword(s):  
Multicomponent Diffusion ◽  
Diffusion Couples ◽  
Uphill Diffusion ◽  
Diffusion Studies ◽  
Isothermal Diffusion ◽  
Mn Diffusion ◽  
Experimental Approaches ◽  
Diffusion Paths ◽  
Interdiffusion Coefficients

Selected isothermal diffusion studies in ternary and quaternary systems are reviewed in order to present analytical and experimental approaches adopted for the determination of interdiffusion fluxes of components, interdiffusion coefficients, diffusional interactions among components, and internal consistency in the experimental data. Several interesting phenomena and observations including uphill diffusion, zero-flux planes and flux reversals, and double serpentine diffusion paths are illustrated with selected single phase Cu-Ni-Zn, Fe-Ni-Al and Cu-Ni-Zn-Mn diffusion couples. The main challenges involved in the experimental determination of interdiffusion data from multicomponent diffusion couples and in the application of such data are also addressed.

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