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A structural analysis of small vapor-deposited 'multiply twinned' gold particlesHigh resolution selected zone dark field, Bragg reflection imaging and weak beam dark field techniques of transmission electron microscopy were used to determine the structure of small gold particles vapor deposited on NaCl substrates. Attention was focused on the analysis of those particles in the 50-150 A range that have pentagonal or hexagonal bright field profiles. These particles have been previously described as multiply twinned crystallites composed of face-centered cubic tetrahedra. The experimental evidence of the present studies can be interpreted on the assumption that the particle structure is a regular icosahedron or decahedron for the hexagonal or the pentagonal particles respectively. The icosahedron is a multiply twinned rhombohedral crystal and the decahedron is a multiply twinned body-centered orthorhombic crystal, each of which constitutes a slight distortion from the face-centered cubic structure.
Document ID
19800026255
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Yang, C. Y.
(Stanford Joint Inst. for Surface and Microstructural Research Moffett Field, CA, United States)
Heinemann, K.
(Stanford Joint Inst. for Surface and Microstructural Research Moffett Field, CA, United States)
Yacaman, M. J.
(Stanford Joint Inst. for Surface and Microstructural Research Moffett Field, CA, United States)
Poppa, H.
(NASAStanford Joint Institute for Surface and Microstructure Research; Stanford University Moffett Field, Calif., United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1979
Subject Category
Solid-State Physics
Accession Number
80A10425
Funding Number(s)
CONTRACT_GRANT: NASA 2249
Distribution Limits
Public
Copyright
Other

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