MAX-phases investigated by soft X-ray emission spectroscopy
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 (Refereed)
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.
, Ceramic Engineering and Science Proceedings, ISSN 0196-6219 ; Volume 27, Issue 2
IdentifiersURN: urn:nbn:se:uu:diva-140141ISI: 000284977900032ISBN: 978-0-470-08052-8OAI: oai:DiVA.org:uu-140141DiVA: diva2:383166
30th International Conference and Exposition on Advanced Ceramics and Composites Cocoa Beach, FL, JAN 22-27, 2006