Coexistence of {l_brace}011{r_brace} facets with {l_brace}112{r_brace} facets on W(111) induced by ultrathin films of Pd
- Department of Physics and Astronomy, and Laboratory for Surface Modification, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854 (United States)
- Department of Physics, National Chung Cheng University, Chia-Yi 621 (Taiwan)
- Physics Department, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong (China)
The faceting of Pd/W(111) to form nanoscale three-sided pyramids with {l_brace}011{r_brace} facets has been observed using a scanning tunneling microscope (STM). In contrast to the well-documented {l_brace}112{r_brace} faceting, which can transform the entire Pd/W(111) surface to a morphology composed completely of pyramidal {l_brace}112{r_brace} facets, the {l_brace}011{r_brace} faceting of Pd/W(111) occurs in coexistence with {l_brace}112{r_brace} faceting upon prolonged annealing. While {l_brace}112{r_brace} facets are found to grow in size (ranging from {approximately}3 to 15 nm) with increasing annealing temperatures, the dimensions of {l_brace}011{r_brace} facets appear to be limited to {approximately}2.5 nm. The coexistence of two types of pyramidal facets is consistent with energetic considerations based on first-principles calculations. The difference in their typical sizes is, on the other hand, interpreted as an evidence for kinetic factors in the faceting processes. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 336688
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 15 Vol. 59; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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