title: The effect of oxide additions on medium-range order structures in borosilicate glasses.
abstract: Boron-11 nuclear magnetic resonance (MAS NMR) and Raman spectroscopies have been used to study four families of glasses: xCs2O(100-x)ZMW (0<x<10), where ZMW represents the borosilicate glass MW to which oxides Z (Al2O3, La2O3and 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 Al2O3or La2O3are present, and decreases when MgO is present.
authors.affiliation: Department of Physics, Warwick University, Coventry CV4 7AL, UK.
authors.forename: B G
authors.initials: BG
authors.lastname: Parkinson
authors.forename: D
authors.initials: D
authors.lastname: Holland
authors.forename: M E
authors.initials: ME
authors.lastname: Smith
authors.forename: A P
authors.initials: AP
authors.lastname: Howes
authors.forename: C R
authors.initials: CR
authors.lastname: Scales