Year: 2011
Type: article
Abstract: 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 ∼ 3.7-3.9 Å, 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.
Authors: J A Johnson, C J Benmore, D Holland, J Du, B Beuneu, A Mekki
Language: English
Subfield: Ceramics and Composites
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
Awards: G102163711, G107546177, G1286251239, G1313983767, G1664757510, G2287611682, G262962599, G3075337988, G426311843, G498139845, G513797252, G5387317844, G6848031779, G6918803902, G7583137537, Integrated Experimental and Simulation Studies of the Structure and Dissolution Mechanism of Bioactive Glasses, G969889393, G993149817
OpenAlex ID: W1672713796