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This brief is based on computations performed on unary neutral and
charged iron clusters, binary iron clusters, and iron clusters
interacting with carbon and oxygen atoms as well as with a number
of diatomics and water. The author considers geometrical structure,
thermodynamic stability and electronic properties which are
compared with experimental data. Special attention is paid to the
dependence of total spin magnetic moments of iron clusters on their
size, charge and interactions with dopant and absorbed atoms. In
the dopant case, species such as 3d-metal, 4d-metal, Al, and Gd
atoms are considered. In the adsorption case interactions of carbon
atoms with iron clusters as the initial stage of catalyzed carbon
nanotube growth are presented. Interactions of iron clusters with
oxygen atoms are presented and the superexchange mechanism is
discussed. Of special interest is the tracking of changes due to
the evolution from a few atoms to a nanocluster.
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