Tellurite And Fluorotellurite Glasses For Active And Passive

Temperature / o C
10. Future work; MDO 396
400
380
360
340
320
300
280
o Non-linear refractive index.
• Construct time-temperature-transformation (TTT) diagrams of TeO2-Na2O-ZnF2
glasses using an oxidising atmosphere in differential scanning calorimeter (DSC).
Fig. (10.4) shows measurements made in sealed gold pans with a nitrogen
atmosphere on TeO2-Na2O-ZnF2 glasses, and nose of TTT diagram appeared to
reside at t = 0, indicating glass formation not possible under inert / reducing
conditions. Possibly due to higher volatilisation under these conditions (see
section 5.3.1.2.).
y=y0+A1exp(-x/t1)
Chi^2 = 8.5467
R^2 = 0.99421
y0 235.53416 ±8.7293
A1 162.41432 ±7.40624
t1 11.22509 ±1.15946
260
0 2 4 6 8 10 12 14 16
Time / sec.
Temperature / o C
380
360
340
320
300
280
y=y0+A1exp(-x/t1)
Chi^2 = 1.41625
R^2 = 0.99897
y0 233.55743 ±3.52679
A1 164.80211 ±2.93419
t1 10.80068 ±0.44919
260
0 2 4 6 8 10 12 14 16
Time / sec.
(a) (b)
Fig. (10.4): Time-temperature-transformation (TTT) diagrams of (a) cladding
65TeO2-10Na2O-25ZnF2 mol. % and (b) core 70TeO2-10Na2O-20ZnF2 mol. %
glasses, using DSC in gold pans sealed under a nitrogen atmosphere.
• Manufacture structured TeO2-Na2O-ZnF2 fibre using rotational casting / rod-in-
tube methods.
• Further X-ray photoelectron spectroscopy (XPS) studies, relating these to FTIR
and Raman measurements of structure.