Role of chemical potentials in surface reconstruction: A new model and phase transition of GaAs(111)2x2.
نویسندگان
چکیده
منابع مشابه
Phase-Transformation of Gamma-Allumina to Alpha-Alumina as an Industrial Catalyst Support
The phase transformation of aluminum hydrates yields various forms of alumina (d, q, K) and eventually alpha-alumina. The decrease in the specific surface area of alumina upon heat treatment is due to changes in crystalline structure and hence a decrease in the porosity of the material, Although the conversion of gamma-alumina to alpha-structure takes place with a lowering in surface area and p...
متن کاملCalculation for Energy of (111) Surfaces of Palladium in Tight Binding Model
In this work calculation of energetics of transition metal surfaces is presented. The tight-binding model is employed in order to calculate the energetics. The tight-binding basis set is limited to d orbitals which are valid for elements at the end of transition metals series. In our analysis we concentrated on electronic effects at temperature T=0 K, this means that no entropic term will be pr...
متن کاملMetastable Phase of the Au(111) Surface in Electrolyte Revealed by STM and Asymmetric Potential Pulse Perturbation
We report, for the first time, a new phase of the Au(111) surface that is different from the well-known reconstructed (22 √3) and the unreconstructed (1 1) states. This new metastable phase is characterized by a high density of highly mobile atoms, the absence of islands, and a paucity of reconstruction stripes. This phase results from the lifting of the reconstruction in the 0.1 M HClO4 interf...
متن کاملStructure and local-equilibrium thermodynamics of the c(2x2) reconstruction of rutile TiO2 (100).
We resolve the structure of a c(2x2) reconstruction of the rutile TiO2 (100) surface using a combination of transmission electron diffraction, direct methods analysis, and density functional theory. The surface structure contains an ordered array of subsurface oxygen vacancies and is in local thermodynamic equilibrium with bulk TiO2, but not the with oxygen gas-phase environment. The transition...
متن کاملReconstructions of the InP„111...A surface
Indium phosphide was deposited on InP(111)A substrates by metalorganic vapor-phase epitaxy. Then, the surface was characterized by scanning tunneling microscopy, low-energy electron diffraction, and x-ray photoelectron spectroscopy. Two reconstructions were observed: the (232) and the ()3))R30° with phosphorus coverages of 0.25 and 1.0060.05 ML ~monolayers!, respectively. The (232) was found to...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Physical review letters
دوره 56 26 شماره
صفحات -
تاریخ انتشار 1986