Issue 16, 2012
From the journal:

CrystEngComm

Experimental evidence of a diffusion barrier around BaF2nanocrystals in a silicate glass system by ASAXS

Vikram Singh Raghuwanshi,*a   Armin Hoell,a   Christian Bockerb  and  Christian Rüsselb  

* Corresponding authors

a Helmhlotz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin, D-12489, Germany
E-mail: vikram.raghuwanshi@helmholtz-berlin.de
Fax: +49 30 8062 15752
Tel: +49 30 8062 15756

b Otto-Schott-Institut für Glaschemie, Friedrich-Schiller-Universität Jena, Fraunhoferstrasse 6, Jena, D-07743, Germany

Abstract

Nanocrystals of BaF2 precipitate during controlled annealing of silicate glasses composed of SiO2, Al2O3, K2O, Na2O, BaF2 and BaO. Structural characteristics such as size, shape, volume fraction and size distribution of nanoparticles in the glass matrix were studied by anomalous small angle x-ray scattering (ASAXS). Fitted ASAXS curves near the Ba absorption edge reveal the formation of a core-shell structure. Furthermore, ASAXS results allowed to determine quantitatively the composition of the nanocrystals, the surrounding region (shell) and the matrix. The evaluated composition gives evidence for an enrichment of Si atoms in a shell, that surrounds the particles and acts as a diffusion barrier. Resonant curve analysis reveals the quantitative information of the Ba atoms used in the formation of BaF2 nanoparticles.

Graphical abstract: Experimental evidence of a diffusion barrier around BaF2 nanocrystals in a silicate glass system by ASAXS

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Article information

DOI
https://doi.org/10.1039/C2CE06544D
Article type
Paper
Submitted
17 Nov 2011
Accepted
01 May 2012
First published
15 Jun 2012

CrystEngComm, 2012,14, 5215-5223

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Experimental evidence of a diffusion barrier around BaF2 nanocrystals in a silicate glass system by ASAXS

V. S. Raghuwanshi, A. Hoell, C. Bocker and C. Rüssel, CrystEngComm, 2012, 14, 5215 DOI: 10.1039/C2CE06544D

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