Monitoring preparation and phase transitions of carburized W(110) by reflectance difference spectroscopy
| Autor: | Magdalena Bachmann, Peter Zeppenfeld, Mariella Denk, Erminald Bertel, Norbert Memmel, Michael Hohage |
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| Rok vydání: | 2012 |
| Předmět: |
Auger electron spectroscopy
Phase transition Materials science Low-energy electron diffraction Analytical chemistry General Physics and Astronomy chemistry.chemical_element Surfaces and Interfaces General Chemistry Tungsten Condensed Matter Physics Article Carbon Auger-electron spectroscopy Surfaces Coatings and Films Hysteresis chemistry Electron diffraction Reflectance difference spectroscopy Spectroscopy |
| Zdroj: | Applied Surface Science |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2012.06.089 |
| Popis: | Highlights ► Real-time in situ monitoring of W(1 1 0) surface cleaning. ► Real-time in situ monitoring of carburazation kinetics on W(1 1 0) by RDS. ► Phase transformation R(15 × 3)-C/W(1 1 0)–R(15 × 12)-C/W(1 1 0) studied by RDS, AES and LEED. Reflectance difference spectroscopy (RDS) is applied to follow in situ the preparation of clean and carburized W(1 1 0) surfaces and to study the temperature-induced transition between the R(15 × 3) and R(15 × 12) carbon/tungsten surface phases. RDS data for this transition are compared to data obtained from Auger-electron spectroscopy and low-energy electron diffraction. All techniques reveal that this transition, occurring around 1870 K, is reversible with a small hysteresis, indicating a first-order-like behaviour. The present results also prove a high surface sensitivity of RDS, which is attributed to the excitation of electronic p-like surface resonances of W(1 1 0). |
| Databáze: | OpenAIRE |
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