Szczegóły publikacji
Opis bibliograficzny
Nonstoichiometry and self-diffusion in $\alpha$–MnS / S. MROWEC, Z. GRZESIK // Diffusion and Defect Data – Solid State Data. Part B, Solid State Phenomena ; ISSN 1012-0394. — 2000 — vol. 72, s. 69–77. — Bibliogr. s. 77, Abstr. — Publikacja dostępna online od: 2000-01-21. — W Web of Science ISBN10 3-908450-51-9. — Diffusion and Reactions : proceedings of the 2nd International Conference : Zakopane, Poland, September 14–18, 1999 / ed. M. Danielewski. — Switzerland : Scitec Publications Ltd, 2000. — ISBN 978-3-908450-51-1
Autorzy (2)
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 2657 |
|---|---|
| Data dodania do BaDAP | 2001-04-18 |
| DOI | 10.4028/www.scientific.net/SSP.72.69 |
| Rok publikacji | 2000 |
| Typ publikacji | referat w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Diffusion and Defect Data. Solid State Data, Part B. Solid State Phenomena |
Abstract
Deviations from stoichiometry and chemical diffusion in metal-deficit manganous sulphide (Mn1-yS) have been studied as a function of temperature (973 - 1273 K) and sulphur activity (10(-1) - 10(4) Pa) using novel microthermogravimetric technique. It has been found that the nonstoichiometry y is the following function of temperature and equilibrium sulphur pressure: y = 4 77.10(-2) p(S-2)(1/6) exp(-41.7 kJ/mol/RT) clearly indicating that the cation vacancies in Mn1-yS do not interact, are fully ionized and are randomly distributed in the crystal lattice. Reequilibration rate measurements of nonstoichiometry have shown that the vacancy diffusion coefficient, D-V, being the direct measure of defect mobility, does not depend on their concentration and is the following function of temperature: D-v = 1.97 . 10(-2) exp(-83.4kJ/mol/RT) Using both these results self-diffusion coefficient of cations in Mn1-yS has been calculated as a function of T and p(S-2): D-Mn. = 60 . 10(-4) p(S2)1/6 exp(-142.0 kJ / mol/RT).