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    Atomic structure and segregation in alkali-metal heteroclusters

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    Atomic structure and ... (536.8Kb)
    Identificadores
    URI: http://hdl.handle.net/10902/1679
    DOI: 10.1103/PhysRevB.42.5000
    ISSN: 0163-1829
    ISSN: 1095-3795
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    Author
    Mañanes Pérez, ÁngelAutoridad Unican; Íñiguez, María Pilar; López, María José; Alonso, Julio Alfonso
    Date
    1990-09-15
    Derechos
    © The American Physical Society
    Publicado en
    Physical Review. B, Condensed Matter, vol 42, número 8, pag. 5000-5008, 1990
    Publisher
    American Physical Society
    Enlace a la publicación
    http://dx.doi.org/10.1103/PhysRevB.42.5000
    Abstract:
    The ground-state atomic and electronic distributions in NamCsn clusters with composition m=n and m=2n have been calculated by minimizing the total cluster energy using the density-functional formalism. The approximation is made by replacing the total external potential of the ions by its spherical average around the cluster center during the iterative process of solving the Kohn-Sham equations for each geometry tested. In the size range studied here (up to 90 atoms per cluster), the cluster is composed of well-separated homoatomic Na and Cs shells, the external one always being a Cs shell. We have also found that the cohesive energy goes rapidly to the bulk limit. An analysis of the geometries shows strong cluster reconstruction with increasing size. By comparing the geometry of pure Nan with that of the Nan core in NanCsn for clusters formed by only an inner Na layer and an outer Cs layer, we have observed that the Nan core adopts a geometry different in most cases from that of the free Nan cluster, and such that the number of faces of the polyhedron formed by the Nan core is as close as possible to the number of external Cs atoms, in order to accomodate these Cs atoms on top of the faces of the polyhedron.
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    • D15 Artículos [352]

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    UNIVERSIDAD DE CANTABRIA

    Repositorio realizado por la Biblioteca Universitaria utilizando DSpace software
    Contact Us | Send Feedback
    Metadatos sujetos a:licencia de Creative Commons Reconocimiento 3.0 España