Self-diffusion of iron and sulfur in ferrous sulfide

Autor:	R. H. Condit, C. E. Birchenall, R. R. Hobbins
Rok vydání:	1974
Předmět:	chemistry.chemical_classification Self-diffusion Sulfide Inorganic chemistry Metals and Alloys Analytical chemistry chemistry.chemical_element Iron sulfide Sulfur Ferrous Inorganic Chemistry chemistry.chemical_compound chemistry Vacancy defect Materials Chemistry Diffusion (business) Stoichiometry
Zdroj:	Oxidation of Metals. 8:409-455
ISSN:	1573-4889 0030-770X
DOI:	10.1007/bf00603390
Popis:	By use of radiotracer techniques, the iron self-diffusion coefficient in ferrous sulfide single crystals above 620 K was found to be D = D0δ exp {−[(81±4) + (84±20)δ]/RT}where the exponential units are kJ/mole, D0 is 1.7± 0.1×10−2 and 3.0±0.2 × 10−2 cm2 sec−1for diffusion in the a- and c-directions, respectively, and δ is the deviation from stoichiometry as given in the formula, Fe1-δS.This is a vacancy diffusion mechanism and is discussed in detail. Below 570 K the coefficient is lower than the values given by this equation because of vacancy ordering. The diffusion coefficient for sulfur is many orders of magnitude smaller than for iron. The significance of the data for the Fe−S2reaction and other examples of iron diffusion is discussed.
Databáze:	OpenAIRE
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