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Electronic structure analysis of the pressure induced metamagnetic transition and magnetovolume anomaly in Fe3C - Cementite
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
2005 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 17, no 46, p. 7345-7352Article in journal (Refereed) Published
Abstract [en]

Within the framework of ab initio electronic structure calculations we study a mechanism for the recently discovered pressure induced metamagnetic transition in Fe3C-cementite. It is shown that the transition occurs between a high moment ferromagnetic state and a non-magnetic (non-spin-polarized) state without stabilization of any intermediate antiferromagnetic-like state, which may explain the experimentally observed difference in character of the transitions in Fe3C and fcc Fe-Pt. Although both materials are Invar-type systems we find considerable differences between their electronic structures and the degrees of localization, or itinerancy, of the Fe magnetic moments. The possibilities for describing the thermal expansion anomaly in Fe3C within existing approaches to the Invar problem are discussed in detail.

Place, publisher, year, edition, pages
2005. Vol. 17, no 46, p. 7345-7352
Keywords [en]
invar alloy, carbides
Identifiers
URN: urn:nbn:se:kth:diva-15237DOI: 10.1088/0953-8984/17/46/018ISI: 000233785700023Scopus ID: 2-s2.0-27744449810OAI: oai:DiVA.org:kth-15237DiVA, id: diva2:333278
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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