Journal article
Crystal-chemistry of the Ti 3AlC 2 and Ti 4AlN 3 layered carbide/nitride phases—characterization by XPS
The Journal of physics and chemistry of solids, v 62(4), pp 811-817
2001
Abstract
The
M
n+1
AX
n
layered carbide/nitride-derived phases, where
M is an early transition metal,
A is an A-group element and
X is N or C, have an unusual combination of mechanical, electrical and thermal properties. The surface and crystal-chemistries of two members with
n=2 and 3 have been investigated by X-ray photoelectron spectroscopy. The results show that the constituent species are characterized by low binding energies, sometimes exceptionally so. The energies are 281.0–281.5 and 396.9
eV, respectively, for C 1s and N 1s, both of which are at, or below, the lowest values measured for carbides and nitrides. Similarly the Ti 2p energies, in the range 454.0–454.7
eV, are comparable to that of Ti metal and TiC, while the energy of the Al 2p, 72.0
eV, is lower by ca. 0.8
eV than that for Al metal. The signature of the XTi
6 octahedral units in the stacking sequence is reminiscent of the corresponding units in TiN, and it is found that a decrease in Ti 2p binding energy is correlated with decrease in average X-Ti bond length. The low binding energies of the A-type species, Al and Si, in planar coordination suggest that binding and thus screening may be derived from out-of-plane interactions. Results relevant to oxidation arising from exposure to air have been obtained.
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Details
- Title
- Crystal-chemistry of the Ti 3AlC 2 and Ti 4AlN 3 layered carbide/nitride phases—characterization by XPS
- Creators
- S. Myhra - Ricardo AEAJ.A.A. Crossley - Ricardo AEAM.W. Barsoum - Drexel University
- Publication Details
- The Journal of physics and chemistry of solids, v 62(4), pp 811-817
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000167511100028
- Scopus ID
- 2-s2.0-0035311947
- Other Identifier
- 991019167845304721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Multidisciplinary
- Physics, Condensed Matter