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Structural rearrangement of solid surfaces due to competing adsorbate-substrate interactions.
E V Vakarin1, A E Filippov, J P Badiali
1Structure et Réactivité des Systèmes Interfaciaux, Université Pierre et Marie Curie, 4 Place Jussieu, 75230 Paris Cedex 05, France.
Summary
Adsorbate interactions can induce continuous structural changes in substrates. This occurs due to competing forces, leading to complex adsorbate arrangements and substrate substructures.
Area of Science:
- Condensed matter physics
- Materials science
- Surface science
Background:
- Adsorbate-substrate interactions are crucial for surface phenomena.
- Understanding structural transitions is key to materials design.
- Previous work (Phys. Rev. Lett. 81, 3904 (1998)) explored related phenomena.
Purpose of the Study:
- To investigate how competing adsorbate interactions induce substrate transitions.
- To determine the factors controlling the threshold for these transitions.
- To explore the resulting adsorbate structures and substrate modifications.
Main Methods:
- Generalized lattice gas theory
- Brownian dynamics simulations
Main Results:
- Competing adsorbate interactions can cause continuous distortive transitions in substrates.
- Substrate rigidity and adsorbate quasielastic energy determine the transition threshold.
- Complex adsorbate structures (honeycomb, quasicrystalline pentagonal) and substrate substructures emerge.
Conclusions:
- Adsorbate-induced substrate transitions are driven by interaction competition.
- The findings generalize and extend previous theoretical and simulation studies.
- This work provides insights into adsorbate-substrate structural dynamics.