Mass spectrometric study of vaporization of cesium-containing borosilicate glasses

Effect of minor additions on structure and volatilization loss in simulated nuclear borosilicate glasses

“…11 B MAS NMR measurements of the medium-range order reedmergnerite and danburite structures present in all compositions, confirm that volatility is more pronounced in aluminium oxide-and lanthanum oxide-containing glasses, where there is an increasing presence of danburite units, containing energetically less favorable B 4 -B 4 bonds and this is confirmed by volatilization measurements on caesium-containing danburite and reedmergnerite glasses. The composition of the volatile species was found to be of a mixed-alkali borosilicate form, whereas previous results in similar studies have found it to be alkali borate [7][8][9][10].…”

“…8) show the volatile species to contain caesium, sodium, boron, silicon and probably lithium, suggesting the composition to be mixed-alkali borosilicate in form. The studies carried out by Asano et al [7,9,10] and Bonnell et al [8] on vaporization from caesium-containing borosilicate glasses, found the composition of the vapour to be alkali borate in form, devoid of any silicon.…”

“…A significant problem associated with the process of HLW vitrification is the evolution of a volatile species at the glass melt stage. Although the volatile species is known to be caesium-containing [6][7][8][9][10], its overall composition and the structural conditions affecting its formation have still to be fully established. We have sought to identify those structural changes which occur in the solid glass when caesium oxide is added to a variety of simulated waste-forms and attempt to relate these to the measured volatilization losses from the melt.…”

Thermodynamic properties and structure of gaseous metaborates

“…The polymerization reactions (6)-(8) of gaseous alkali metaborates were investigated in [19,23,[34][35][36][37][38][39], and the mixed dimerizarion reaction (9) of gaseous alkali metaborates was studied in [34][35][36][37][38].…”

Phase equilibria and thermodynamic properties of components in the Cs2O-B2O3-SiO2 system at high temperatures

“…The thermodynamic properties of four samples in the Cs 2 O-B 2 O 3 -SiO 2 system were originally determined by the electromotive force method [6]. The activities of CsBO 2 and Cs 2 (BO 2 ) 2 in the glass with the oxide ratio Cs 2 O : B 2 O 3 : SiO 2 = 1 : 1 : 3 at 1000 K were determined by differential mass spectrometry [7].…”