NDLI: Formation of silver particles and periodic precipitate layers in silicate glass induced by thermally assisted hydrogen permeation

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Formation of silver particles and periodic precipitate layers in silicate glass induced by thermally assisted hydrogen permeation

Content Provider	Scilit
Author	Mohr, C. Dubiel, M. Hofmeister, H.
Copyright Year	2000
Description	Journal: Journal of Physics: Condensed Matter Nanoscale silver particles embedded in sodium silicate glass were produced by Na/Ag ion exchange and subsequent thermal treatment in a hydrogen atmosphere. Their structure and spatial distribution were studied by conventional and high-resolution electron microscopy (HREM). Two different mechanisms of particle formation could be identified: (i) reduction of ionic silver by hydrogen and formation of mostly defective particles (twinned) within a near-surface region; and (ii) formation of single-crystalline particles in the interior of the glass resulting from reduction by means of polyvalent iron ions. Electron microscopy investigation revealed the completion of periodic layers of silver particles in near-surface regions with high silver concentration induced by thermally assisted hydrogen permeation. The self-organized periodic layer formation may be explained in terms of Ostwald's supersaturation theory, assuming interdiffusion of two mobile species. Analysis of lattice plane spacings from HREM images of silver particles revealed the typical size-dependent lattice contraction. The extent of this, however, was found to be different for particles formed by hydrogen permeation and those formed by interaction with polyvalent iron ions. These differences reflect different influences of the surrounding glass matrix, probably originating from the conditions of particle formation (thermal history).
Related Links	http://pdfs.semanticscholar.org/1e7c/d2717a3df5bdb5790ceeea9d0fca93da6ca1.pdf http://iopscience.iop.org/article/10.1088/0953-8984/13/3/312/pdf
Ending Page	536
Page Count	12
Starting Page	525
ISSN	09538984
e-ISSN	1361648X
DOI	10.1088/0953-8984/13/3/312
Journal	Journal of Physics: Condensed Matter
Issue Number	3
Volume Number	13
Language	English
Publisher	IOP Publishing
Publisher Date	2000-12-19
Access Restriction	Open
Subject Keyword	Journal: Journal of Physics: Condensed Matter Self Organization Thermal Treatment Electron Microscopy Ion Exchange
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science

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