Abstract
Phase transitions occurring at the Mn/ZnO interface upon annealing are probed in situ by high-energy X-ray: photoelectron and absorption spectroscopies. A thin Mn film (similar to 1 nm) is grown on the (000 (1) over bar) surface of a ZnO single crystal. Upon annealing to progressively higher temperature ranging from 575 to 800 K, various Mn phases form successively. At first, the Mn film oxidizes and a MnO layer forms on top of the surface. Then, while Mn atoms diffuse deeper into the bulk of ZnO, ZnyMn3-yO4 starts to form. Finally, at the highest annealing temperature, Mn appears to be substitutionally diluted at Zn sites within the ZnO lattice.
| Original language | English |
|---|---|
| Pages (from-to) | 665-670 |
| Number of pages | 6 |
| Journal | Journal of Physical Chemistry C |
| Volume | 116 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 12 Jan 2012 |
Funding
We thank C. Moisson (NOVASiC), for the MCP polishing of and providing the ZnO single crystals. We would like to thank Heiko Schulz-Ritter, Sebastian Thiess, and Wolfgang Drube for excellent technical and experimental support at the beamline BW2 at DESY (Deutsches Elektronen-Synchrotron). This work was supported by CERUNA-University of Namur, Belgian National Fund for Scientific Research (F.S.R-FNRS), DESY and the European Commission under contract RII3-CT 2004-506008 (IA-SFS).
Keywords
- K-EDGE XANES
- PHOTOELECTRON-SPECTROSCOPY
- PHOTOEMISSION SPECTRA
- METAL COMPOUNDS
- MN
- SPECIATION
- MANGANESE
- SURFACE
- FILMS