Tellurite And Fluorotellurite Glasses For Active And Passive

9. Conclusions; MDO 385
NBOs respectively) in the glass (82.5 % equalised at 530.9 eV), and a smaller
asymmetric shoulder due to OH groups at the cleave surface (7.5 % 532.4 eV).
• The semi-quantitative analysis of this glass produced at. % values close to the
batched values (2.5 to 13.9 % variation).
• XPS of the polished surface of this glass showed a large increase in the OH peak
intensity as expected, and larger variation in the at. % values from the batched
values (14.9 to 65.1 % variation), due to degradation and contamination at the
glass surface. The surface was oxygen rich, and tellurium and tungsten depleted.
• In addition to the OH, BO and NBOs O1s peaks, a component was seen at around
533.9 eV, possibly due to M=O species (e.g. Te=O, C=O).
• There were two components to the F1s peak of the cleaved surface of glass
MOF001_iii (65TeO2-10Na2O-25ZnF2 mol. %), which was melted for 1.75 hours
with un-fluorinated ZnF2, possibly due to different bonding environments
surrounding the fluorine anion, most likely Na-F, F-Zn-F, and O-Zn-F.
• Like the tungsten-tellurite glass, the O1s peak of this ZnF2 containing glass
contained a BO / NBO, and OH component. A small higher binding energy
component was also seen, as with the polished surface of the tungsten-tellurite
glass, though to be due to M=O species.
• Semi-quantitative analysis of the cleaved surface of this glass produced at. %
values close to the batched values, with only fluorine significantly lower. This is
to be expected, as fluoride species (e.g TeFx) would be the most volatile species in
these glasses.