Interdiffusion in Ionic Compounds

Belova, Irina V.; Murch, Graeme E.

doi:10.4028/www.scientific.net/df.6.44

Cited by 2 publications

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References 17 publications

(33 reference statements)

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“…Interestingly, the rate of interdiffusion is now dominated by the slower cation species whereas in the Darken-Manning Equation the rate of interdiffusion is dominated by the faster species. Equation26(as shown) is fully consistent with the Manning formalism for the random alloy model (here, a random distribution of the two types of cation on a sublattice).Equation 26 does however change when the almost exact MAA formalism is applied[36]. The expression for the interdiffusion coefficient becomes:…”

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confidence: 53%

“…The Vacancy-Wind Effect for Interdiffusion in Ionic Compounds Interdiffusion of cations having the same valence in strongly insulating ionic compounds such as various metal oxides, alkali and silver halides, glasses and some metal silicates and carbonates can also be described as interdiffusion in a quasi-binary system. This has been described and reviewed recently [35]. Here we simply summarize the situation and especially the role of the off-diagonal Onsager coefficients.…”

Section: Contemporary Advances In Diffusion In Solidsmentioning

confidence: 94%

“…As already indicated, 𝑆𝑆 𝑘𝑘𝑃𝑃 equals unity in the Manning formalism for the random alloy model. However, using the MAA formalism [35,36] the behavior of 𝑆𝑆 𝑘𝑘𝑃𝑃 is quite different and is shown in Figure 7 for a random distribution of cations (i.e. the random alloy model).…”

Section: Contemporary Advances In Diffusion In Solidsmentioning

confidence: 99%

“…Somewhat similar to the other vacancy-wind factors seen above, the peak is 𝑆𝑆 𝑘𝑘𝑃𝑃 in the Nernst-Planck equation produces a small but significant increase in the value of the interdiffusion coefficient for most diffusion situations when the atom-vacancy exchange frequencies differ by say an order of magnitude. Further discussion can be found in [35].…”

Section: Contemporary Advances In Diffusion In Solidsmentioning

confidence: 99%

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The Vacancy-Wind Factor and the Manning Factor Occurring in Interdiffusion and Ionic Conductivity in Solids

Belova¹,

Murch²

2019

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In crystalline solids, during such processes as chemical interdiffusion in alloys, ionic conductivity and the annealing out of radiation damage there will inevitably be a net flux of vacancies. In most cases, when different species of atoms have different jump rates with vacancies within a net flux of vacancies, the phenomenon of the vacancy-wind effect will occur. This effect was first discovered in the 1960s by the late Dr John Manning. It is a subtle phenomenon that comes about because of the local redistribution of the equilibrium concentration of vacancies with respect to two or more species of drifting atoms in a driving force. The effect is captured in various ‘vacancy-wind factors’ (some of which are now sometimes called Manning factors) which formally arise from non-zero off-diagonal Onsager phenomenological transport coefficients and non-unity values of the tracer correlation factors. In this paper, the effect is reviewed and discussed.

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supporting

confidence: 53%

Section: Contemporary Advances In Diffusion In Solidsmentioning

confidence: 94%

Section: Contemporary Advances In Diffusion In Solidsmentioning

confidence: 99%

Section: Contemporary Advances In Diffusion In Solidsmentioning

confidence: 99%

See 2 more Smart Citations