Tellurite And Fluorotellurite Glasses For Active And Passive

9. Conclusions; MDO 386
• For glass MOF001_v (65TeO2-10Na2O-25ZnF2 mol. %), which was melted for 2
hours with fluorinated ZnF2 the O1s peak contained NBO / BO, OH, and M=O
components, however the F1s peak consisted of a single symmetric component
compared to the unfluorinated 1.75 hour melt. This is possible due to the reduced
number of F-Zn-OH species in the glass.
• Again, the OH content of the polished glass surface was greater than the cleaved
surface, and a fourth higher binding energy O1s component was seen possibly due
to C-O contamination.
• Oxygen levels were higher at the polished surface compared to the cleave, and all
other elements lower than batched (particularly F), which were leached on contact
with moisture.
Environmental and chemical durability
• NaOH, H2SO4, and HCl solutions produced poor etches for TeO2-Na2O-ZnO
based glasses at various concentrations (1 and 3M), and temperatures (15 and
21°C).
• Glass 65TeO2-10Na2O-25ZnF2 mol. % was relatively durable to 21°C distilled
water, with only 0.34 wt. % loss after 21 days immersion.
• As expected, weight loss for this glass was higher when immersed in 60°C
distilled water, with around 4.5 wt. % loss after 21 days.
• This author proposes that the main regimes for water attack of these glasses
(TeO2-Na2O-ZnF2) were F - /OH - exchange at lower temperatures (≈ 21°C), and