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Thermal stability of Ti3SiC2 thin films
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
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2007 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 55, no 4, 1479-1488 p.Article in journal (Refereed) Published
Abstract [en]

The thermal stability of Ti3SiC2(0 0 0 1) thin films is studied by in situ X-ray diffraction analysis during vacuum furnace annealing in combination with X-ray photoelectron spectroscopy, transmission electron microscopy and scanning transmission electron microscopy with energy dispersive X-ray analysis. The films are found to be stable during annealing at temperatures up to 1000 °C for 25 h. Annealing at 1100–1200 °C results in the rapid decomposition of Ti3SiC2 by Si out-diffusion along the basal planes via domain boundaries to the free surface with subsequent evaporation. As a consequence, the material shrinks by the relaxation of the Ti3C2 slabs and, it is proposed, by an in-diffusion of O into the empty Si-mirror planes. The phase transformation process is followed by the detwinning of the as-relaxed Ti3C2 slabs into (1 1 1)-oriented TiC0.67 layers, which begin recrystallizing at 1300 °C. Ab initio calculations are provided supporting the presented decomposition mechanisms.

Place, publisher, year, edition, pages
2007. Vol. 55, no 4, 1479-1488 p.
Keyword [en]
Ti3SiC2 thin films, Phase transformations, X-ray diffraction, Transmission electron microscopy, Ab initio electron theory
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-10518DOI: 10.1016/j.actamat.2006.10.010ISI: 000244548100033OAI: oai:DiVA.org:uu-10518DiVA: diva2:38286
Available from: 2007-03-29 Created: 2007-03-29 Last updated: 2017-12-11Bibliographically approved

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Wilhelmsson, OlaJansson, Ulf

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