Influence of rare-earth ions on SiO2–Na2O–RE2O3glass structure
Johnson, J. A., Benmore, C. J., Holland, D., Du, J., Beuneu, B. and Mekki, A.. (2011) Influence of rare-earth ions on SiO2–Na2O–RE2O3glass structure. Journal of Physics : Condensed Matter, Vol.23 (No.6). article no.065404. ISSN 0953-8984Full text not available from this repository.
Official URL: http://dx.doi.org/10.1088/0953-8984/23/6/065404
Praseodymium and europium sodium silicate glasses of nominal composition (SiO(2))(0.70-x)(Na(2)O)(0.30)(RE(2)O(3))(x), where RE is the rare earth and 0 <= x <= 0.10, were studied by neutron and high-energy x-ray scattering and classical molecular dynamics simulations. The observation of a significant x-ray intensity in doped as compared to un-doped glasses is indicative of RE-RE correlations at a distance of similar to 3.7-3.9 angstrom, much shorter than would be expected for a homogeneous distribution, suggesting that clustering of the rare-earth cations occurs in both these glass systems at low concentrations. Above x = 0.075 (nominal), minimal changes in this region indicate that the RE atoms are incorporated much more randomly into the glass structure. The molecular dynamics simulations suggest that the rare-earth ions enter the sodium-rich regions in the sodium silicate glasses and act as modifiers. A cluster analysis performed on the model systems indicates that the tendency for clustering is higher in praseodymium-containing glasses than in the europium glasses.
|Item Type:||Journal Article|
|Divisions:||Faculty of Science > Physics|
|Journal or Publication Title:||Journal of Physics : Condensed Matter|
|Page Range:||article no.065404|
|Status:||Not Peer Reviewed|
|Access rights to Published version:||Restricted or Subscription Access|
|Funder:||US Department of Energy, Office of Science, Office of Basic Energy Sciences , National Science Foundation|
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