Hamburg 2001 – wissenschaftliches Programm
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M: Metallphysik
M 33: Postersitzung
M 33.32: Poster
Donnerstag, 29. März 2001, 15:15–19:00, Foyer S4, CCH
Influence of preparation conditions on the microstructure of silver particles in glass — •G.L. Tan1, H. Hofmeister1, and M. Dubiel2 — 1Max-Planck-Institut Halle — 2Fachbereich Physik, Universität Halle
The structural characteristics of metal particles in glass sensitively depend on the route of synthesis and the conditions of thermal treatment. We used transmission electron microscopy to study such effects for Ag particles in soda-lime glass produced by ion exchange and ion implantation, respectively. Upon Na/Ag ion exchange plus subsequent annealing to allow reduction of Ag ions by Fe3O4 contained in the glass we observed distinct changes when slowly cooling down instead of quenching the specimens after heat treatment. These changes mainly concern the structure of metal particles and surrounding matrix, while variations of particle size and concentration with penetration depth remain nearly unaffected. Rapid quenching from 635 ∘C causes build-up of compressive stress near the surface accompanied by cracks in the glass and a broad spectrum of lattice defects in the particles. The defect structure ranges from single twinned to multiply twinned and heavily distorted species. Certain deviations from the bulk lattice indicate a weak interaction across the metal/glass interface and some residual stress in the matrix. Ion implantation enables a well defined spatial distribution of particles in the glass, i.e. restricted to a narrow layer beneath the surface. This procedure, however, produces non-equilibrium structures comparable to those formed in ion exchanged glass upon quenching