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The effect of oxide additions on medium-range order structures in borosilicate glasses

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Article number415114
<mark>Journal publication date</mark>1/10/2007
<mark>Journal</mark>Journal of Physics: Condensed Matter
Issue number41
Volume19
Number of pages12
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Boron-11 nuclear magnetic resonance (MAS NMR) and Raman spectroscopies have been used to study four families of glasses: xCs(2)O(100-x) ZMW(0 < x < 10), where ZMW represents the borosilicate glass MW to which oxides Z (Al2O3, La2O3 and MgO) are added such that, overall, 1.0 <= R (=[modifier]/[B2O3]) <= 2.5; K (=[SiO2]/[B2O3]) = 3.2. These glasses are related to the system used for the vitrification of high-level nuclear waste. The spectra reveal the presence of reedmergnerite and danburite medium-range order structural units in the glasses. The fraction of danburite units increases with the addition of caesium oxide when Al2O3 or La2O3 are present, and decreases when MgO is present.