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Diffusion in interstitial compounds with thermal and stoichiometric defects
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.ORCID iD: 0000-0002-4521-6089
2005 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 98, no 5Article in journal (Refereed) Published
Abstract [en]

The ordinary flux equation for diffusion, which considers the composition gradient as the driving force, is seldom of much use in studying closely stoichiometric phases. Depending on the defect structure it would instead be profitable to use an appropriate function of the activity. Such functions will now be derived and it will be shown how the operating defect mechanism of diffusion can be identified from information on the variation of the activity inside a phase during diffusion. However, it is usually very difficult to measure the activity profile inside a phase. It will be shown how it can be obtained by combining results from several experiments. The method will be used to analyze experimental information on the formation of surface layers of Fe4N and Fe3C.

Place, publisher, year, edition, pages
2005. Vol. 98, no 5
Keyword [en]
dictra, carbon, fe4n, iron, fe3c
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-15041DOI: 10.1063/1.1999833ISI: 000231885600016Scopus ID: 2-s2.0-25144453265OAI: oai:DiVA.org:kth-15041DiVA: diva2:333082
Note
QC 20100525 QC 20120117Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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