Abstract
The intermetallic PdGa is a highly selective and potent catalyst in the semihydrogenation of acetylene, which is attributed to the surface stability and isolated Pd atom ensembles. In this context PdGa single crystals of form B with (1̄ 1̄ 1̄) orientation were investigated by means of X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), scanning tunneling microscopy (STM), X-ray photoelectron diffraction (XPD), and low-energy electron diffraction (LEED) to study the electronic and geometric properties of this surface. UPS and thermal desorption spectroscopy (TDS) were used to probe the chemisorption behavior of CO. The PdGa(1̄ 1̄ 1̄) surface exhibits a (1 × 1) LEED and a pronounced XPD pattern indicating an unreconstructed bulk-truncated surface. Low-temperature STM reveals a smooth surface with a (1 × 1) unit cell. No segregation occurs, and no impurities are detected by XPS. The electronic structure and the CO adsorption properties reveal PdGa(1̄ 1̄ 1̄) to be a bulk-truncated intermetallic compound with Pd-Ga partial covalent bonding.
| Item Type: | Journal article |
|---|---|
| Faculties: | Geosciences > Department of Earth and Environmental Sciences > Crystallography and Materials Science |
| Subjects: | 500 Science > 550 Earth sciences and geology |
| Language: | English |
| Item ID: | 18830 |
| Date Deposited: | 10. Mar 2014, 14:15 |
| Last Modified: | 04. Nov 2020, 13:00 |
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