Szczegóły publikacji
Opis bibliograficzny
Chemical diffusion and defect mobility in non-stoichiometric manganous sulphide / Z. GRZESIK, S. MROWEC, T. WALEC, J. DĄBEK // Journal of Physics and Chemistry of Solids ; ISSN 0022-3697. — 2000 — vol. 61 iss. 5, s. 809–817. — Bibliogr. s. 816–817, Abstr.
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Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 2526 |
|---|---|
| Data dodania do BaDAP | 2001-04-18 |
| Tekst źródłowy | URL |
| DOI | 10.1016/S0022-3697(99)00261-9 |
| Rok publikacji | 2000 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Journal of Physics and Chemistry of Solids |
Abstract
The chemical diffusion coefficient,(D) over tilde, in metal-deficit manganous sulphide, Mn1-yS, has been determined as a function of temperature (700-1273 K) and sulphur activity (10(4)-10(-1) Pa) from re-equilibration kinetics. It has been found that (D) over tilde does not depend on p(S-2) and can be described as a function of temperature by the following empirical equation. (D) over tilde = 5.9 x 10(-2)exp((-83.4 kJ/mol)/RT). Recalculation of these results into the defect (vacancy) diffusion coefficient, D-V, the direct measure of defect mobility, showed that this coefficient is also pressure independent and can be described by the following relationship. D-V = 1.97 x 10(-2)exp((-83.4 kJ/mol)/RT). These results may be considered as the first experimental proof that the mobility of cation vacancies in metal-deficit manganous sulphide does not depend on their concentration. Using this relationship and non-stoichiometry data reported by Rau [H.Rau, J, Phys. Chem. Solids, 39 (1978) 3339] the self-diffusion coefficient of cations in Mn1-yS has been calculated as a function of temperature and sulphur activity: D-Mn = 9.4 x 10(-4)p(S2)(1/6)exp((-124.9 kJ/mol)/RT). The result of these calculations, being in good agreement with recent self-diffusion data obtained with direct tracer methods, clearly indicates that chemical diffusion measurements may offer important information on transport properties of non-stoichiometric metal sulphides.