| Issue |
Microsc. Microanal. Microstruct.
Volume 6, Number 1, February 1995
|
|
|---|---|---|
| Page(s) | 19 - 31 | |
| DOI | https://doi.org/10.1051/mmm:1995104 | |
DOI: 10.1051/mmm:1995104
Electron Energy-Loss Near-Edge Structure of Metal-Alumina Interfaces
Christina Scheu1, Gerhard Dehm1, Harald Müllejans1, Rik Brydson2 et Manfred Rühle11 Max-Planck-Institut für Metallforschung, Institut für Werkstoffwissenschaft Seestraße 92, 70174 Stuttgart, Germany
2 Department of Materials Science and Engineering, University of Surrey, Guildford GU2 5XH, U.K.
Abstract
The physical properties of metal-ceramic composites are strongly
affected by the local chemistry and atomic bonding across the interface.
Information on both
are contained in the energy-loss near-edge structure. The
spectral component specific for the interface can be obtained by
the spatial- difference technique. This method was applied for
the investigation of two different interfaces, namely Al/Al2O3
and Cu/Al2O3. The Al-L2,3 edge at the Al/Al2O3
interface shows a
characteristic energy-loss near-edge structure which was
compared to multiple scattering calculations for Al(O3Al)
tetrahedra with various Al-Al bond lengths. Good agreement with
the experimental data was found for a cluster with an Al-Al bond
length larger than the Al-O distance which is nearly that of
amorphous Al2O3. No interface-specific component could be
detected at the Al-L2,3 edge of the Cu/Al2O3 interface.
However, the energy-loss near-edge structure of the Cu-L2,3 edge
indicates that Cu exists at the interface in a Cu1+ state and
that the chemical bond is established at the interface between
Cu and O atoms.
7920K - Other electron surface impact phenomena.
8280D - Electromagnetic radiation spectrometry chemical analysis.
6848 - Solid solid interfaces.
Key words
alumina -- aluminium -- copper -- electron energy loss spectra -- interface structure -- spectrochemical analysis -- metal alumina interfaces -- metal ceramic composites -- atomic bonding -- spatial difference technique -- multiple scattering calculations -- Al Al bond lengths -- ELNES -- Al Al sub 2 O sub 3 -- Cu Al sub 2 O sub 3
© EDP Sciences 1995