Tellurite And Fluorotellurite Glasses For Active And Passive

7. Surface properties; MDO 302
Wt. loss / %
16
14
12
10
8
6
4
2
y=0.50907x
R 2 = 0.91891
0
0 5 10 15 20 25 30
Time / min.
Fig. (7.33): Etch rate of glass MOF001 (65TeO2-10Na2O-25ZnF2 mol. %) in 4% HF at
21°C.
Absorption coefficient / cm -1
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
Unetched
4% HF (2 min.)
4% HF (10 min.)
Wavelength / µm
6.5 6 5.5 5 4.5 4 3.5 3 2.5
2000
0.00
0
1500 2000 2500 3000 3500 4000
Wavenumber / cm -1
Fig. (7.34): Infrared spectra of the unetched glass, and glasses immersed in 4% HF at
21°C for 2 and 10 min of composition MOF001 (65TeO2-10Na2O-25ZnF2 mol. %).
1750
1500
1250
1000
750
500
250
Loss / dB.m -1