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A Mechanism for Particle Coalescence, Grain Growth and Twin Formation During Annealing of Gold Particles in an Amorphous Silica Matrix

Published online by Cambridge University Press:  21 February 2011

J. McGinn ,
V.A. Greenhut  and
T. Tsakalakos
J. McGinn
Affiliation:
David Sarnoff Research Center, RCA Laboratories, Princeton, NJ 08540
V.A. Greenhut
Affiliation:
Rutgers University, College of Engineering, Piscataway, NJ 08854
T. Tsakalakos
Affiliation:
Rutgers University, College of Engineering, Piscataway, NJ 08854
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Abstract

Direct evidence was obtained for the coalescence of discrete gold particles (∼;lO0 nm) surrounded by a continuous amorphous silica matrix during annealing at 900°C. The particles were found to form high angle boundaries as coalescence occurred. Subsequent annealing revealed that grain growth occurred with relatively rapid elimination of high angle grain boundaries. The coalesced particles became approximately spherical in shape and seven particle morphologies could be distinguished. A majority of particles showed either no defect structure or conventional f.c.c. twins. In more limited cases, a small area of high angle grain boundary, usually of coincidence lattice type, was observed which accommodated intersecting twins. A single self-consistent mechanism can explain the elimination of high angle boundaries and all the various twin structures observed. The mechanism is based on Gleiter's [l] model for grain boundary migration with twin structures resulting from growth accidents on the migrating high angle boundary.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 21: Symposium GREECE – Phase Transformations in Solids , 1983 , 425
Copyright
Copyright © Materials Research Society 1984

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References

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