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- W2060953860 abstract "Bulk ordering in Ag-Pd and other isoelectronic alloys is investigated theoretically by a number of first-principles techniques. The electronic structure and total energy have been calculated by the Green's function Korringa-Kohn-Rostocker and full-potential plane wave methods. The effective cluster interactions of the Ising-type Hamiltonian have been obtained by the screened generalized perturbation method. They reveal a complex concentration-dependent ordering behavior in these alloys due to band filling and Fermi surface effects. In particular we show that long-period superstructures are gradually stabilized by a great number of relatively weak long-range effective pair- and three-site interactions, which can be seen as ``collective'' effect. A similar complex concentration dependence is also found for surfaces of Ag-Pd alloys. The surface composition of the (111) and (100) surface of ${mathrm{Ag}}_{75}{mathrm{Pd}}_{25}$, ${mathrm{Ag}}_{50}{mathrm{Pd}}_{50}$, and ${mathrm{Ag}}_{33}{mathrm{Pd}}_{67}$ alloys have been then investigated by the surface Green's function technique and the screened generalized perturbation method for the effective interactions of the Ising-type Hamiltonian and the grand canonical Monte Carlo method for statistical thermodynamic simulations at finite temperatures. We compare our results with experimental data and other theoretical calculations." @default.
- W2060953860 created "2016-06-24" @default.
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- W2060953860 date "2007-02-23" @default.
- W2060953860 modified "2023-10-01" @default.
- W2060953860 title "Theoretical investigation of bulk ordering and surface segregation in Ag-Pd and other isoelectornic alloys" @default.
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- W2060953860 doi "https://doi.org/10.1103/physrevb.75.054113" @default.
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