The work function of kinked areas on clean, thermally rounded Pt and Rh crystallites: its dependence on the structure of terraces and edges
| Autor: | X.Q.D. Li, Ralf Vanselow |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
geography
geography.geographical_feature_category Condensed matter physics Chemistry Surfaces and Interfaces Condensed Matter Physics Surfaces Coatings and Films Condensed Matter::Materials Science Crystallography Field electron emission Dipole Terrace (geology) Edge structure Atom Condensed Matter::Statistical Mechanics Materials Chemistry Work function Crystallite |
| Zdroj: | Surface Science. 264:L200-L206 |
| ISSN: | 0039-6028 |
| DOI: | 10.1016/0039-6028(92)90154-x |
| Popis: | Field emission studies on clean, thermally rounded Pt and Rh crystallites show that the work function of a kinked area is determined by the terrace structure, the kink atom density and the surface dipole moment of the kink atom. The dipole moment decreases with decreasing terrace interlayer spacing. The work function of kinked areas with given terrace and edge structure shows a linear dependence on the kink atom density if m ⩾ 3 atoms ( m ¬ terrace depth). Areas belonging to the face groups ( Pt , Rh ) S -[ m {111} × {311}], ( Pt ) S -[ m {110} × {100}] and of Pt {110} are thermally roughened. Thermal roughening could not observed on ( Pt , Rh ) S -[ m {100} × {110}], ( Rh ) S -[ m {110} × {100}] or on Rh {110}. Formulae were derived that permit calcula the work function of any face within the above listed non-roughened face groups. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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