Premium
A Note on the Icosahedral Morphology of Ultrafine Metal Particles
Author(s) -
Nara S.
Publication year - 1988
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221490217
Subject(s) - icosahedral symmetry , materials science , crystallography , crystal structure , lattice (music) , planar , condensed matter physics , cubic crystal system , epitaxy , metal , nanotechnology , chemistry , metallurgy , physics , computer graphics (images) , layer (electronics) , acoustics , computer science
A possible interpretation is proposed for the growth morphology of icosahedral ultra fine particles (UFP) of silver, the structure of which are identified as multi‐twin‐particles (MTP) consisting of twenty tetrahedrons having cubic structure accompanied by unavoidable strains or dislocations. It is shown that the stable structure of embryo has the icosahedral symmetry and the twenty triangular facets of icosahedron have the same intra‐planar symmetry with the (111) plane of the cubic close‐packed structure and they provide each a seed for the (111) epitaxial growth of the cubic crystal. It leads consequently to the occurence of the MTP‐icosahedron, near the grain boundaries of which, however, unavoidable lattice strain remains.