Szczegóły publikacji
Opis bibliograficzny
The influence of aliovalent impurities on transport properties of nonstoichiometric manganous sulphide / Stanisław MROWEC, Zbigniew GRZESIK // Bulletin of the Polish Academy of Sciences. Chemistry ; ISSN 0239-7285. — 2002 — vol. 50 no. 1, s. 37–49. — Bibliogr. s. 48–49, Summ.
Autorzy (2)
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 10371 |
|---|---|
| Data dodania do BaDAP | 2002-10-14 |
| Rok publikacji | 2002 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Bulletin of the Polish Academy of Sciences, Chemistry |
Abstract
The influence of chromium and lithium on the manganese sulphidation kinetics has been studied as a function of temperature (973-1273 K) and sulphur activity (10(-1)-10(4) Pa) using a novel microthermogravimetric technique. It has been shown that the sulphidation of Mn-Cr and Mn-Li alloys, like that of pure manganese metal, follows strictly parabolic rate law being thus diffusion controlled. In agreement with the defect model of Mn1-yS it has been found that the sulphidation rate of Mn-Cr alloy is higher than that of pure manganese, the reaction rate is pressure independent and the activation energy of this process is lower. This implies that the concentration of cation vacancies in Mn1-yS-Cr2S3 solid solution is fixed on the constant level by three-valent chromium ions substitutionally incorporated in the cation sublattice of this sulphide. In the case of Mn-Li alloy, on the other hand, the sulphidation rate is lower than that of pure manganese, and the activation energy is higher. These results can again be explained in terms of doping effect.
