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MAX-phases investigated by soft X-ray emission spectroscopy
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
2007 (English)In: MECHANICAL PROPERTIES AND PERFORMANCE OF ENGINEERING CERAMICS AND COMPOSITES II / [ed] Tandon, R, 2007, Vol. 27, no 2, 325-329 p.Conference paper, Published paper (Refereed)
Abstract [en]

The electronic structures of the MAX-phases Ti3AlC2, Ti3SiC2 and Ti3GeC2 were investigated by soft X-ray emission spectroscopy. These nanolaminated carbide compounds represent a class of layered materials with a combination of properties from both metals and ceramics. The bulk-sensitive soft X-ray emission technique is shown to be particularly useful for detecting detailed electronic structure information about internal monolayers and interfaces. A weak covalent Ti-Al bond is manifested by a pronounced shoulder in the Ti L-emission of Ti3AlC2. When Al is replaced by Si or Ge, the shoulder disappears. Furthermore, the spectral shapes of Al, Si and Ge in the MAX-phases are strongly modified in comparison to the corresponding pure elements. By varying the constituting elements, a change of the electron population is achieved causing a change of covalent bonding between the laminated layers, which enables control of the macroscopic properties of the material.

Place, publisher, year, edition, pages
2007. Vol. 27, no 2, 325-329 p.
Series
Ceramic Engineering and Science Proceedings, ISSN 0196-6219 ; Volume 27, Issue 2
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-140141ISI: 000284977900032ISBN: 978-0-470-08052-8 (print)OAI: oai:DiVA.org:uu-140141DiVA: diva2:383166
Conference
30th International Conference and Exposition on Advanced Ceramics and Composites Cocoa Beach, FL, JAN 22-27, 2006
Available from: 2011-01-04 Created: 2011-01-04 Last updated: 2011-01-04Bibliographically approved

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