Near-surface microstructure of Pt-Rh(110) and (111) surfaces
| Autor: | Bernd Schönfeld, Ch. Steiner, Bruce D. Patterson, Gernot Kostorz, Philip R. Willmott, M. M. I. P. van der Klis |
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| Rok vydání: | 2006 |
| Předmět: | |
| Zdroj: | Physical Review B. 73 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.73.174205 |
| Popis: | Diffuse x-ray scattering under grazing incidence was measured of $\mathrm{Pt}\text{\ensuremath{-}}47\phantom{\rule{0.3em}{0ex}}\mathrm{at.}\phantom{\rule{0.2em}{0ex}}%$ Rh(110) and (111) surfaces at $1000\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The elastic scattering contributions of short-range order scattering and displacement scattering were separated from the inelastic scattering contributions that served for data calibration. The modulations in short-range order scattering are small and indicate differences in the near-surface microstructure of the two surfaces: a global maximum at $1\frac{1}{2}0$ (as for the bulk microstructure) for the (110) surface and at $\frac{1}{2}\frac{1}{2}\frac{1}{2}$ positions for the (111) surface. The dominant nearest-neighbor configuration of both surfaces is reminiscent of the segregation profile of a (111) surface. A tendency towards the bulk ``40'' structure is only noted for the (110) surface. |
| Databáze: | OpenAIRE |
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