Tellurite And Fluorotellurite Glasses For Active And Passive
Tellurite And Fluorotellurite Glasses For Active And Passive Tellurite And Fluorotellurite Glasses For Active And Passive
Percentage (%) 80 70 60 50 40 30 20 10 0 6. Optical properties; MDO 189 Strong OH Weak OH Free OH OH type MOD006 (3 mol. % PbO) MOD010 (5 mol. % PbO) MOD012 (5 mol. % GeO2) Fig (6.11): Percentage of OH groups in glass series (80-x)TeO2-10Na2O-10ZnO-xMO, where MO is PbO or GeO2, for MOD006 (x = 3 mol. % PbO), MOD010 (x = 5 mol. % PbO) and MOD012 (x = 5 mol. % GeO2). It can be seen that the percentage of strongly H-bonded OH in all three glasses was approximately the same, ≈ 14 %. The percentage of weakly H-bonded OH and free OH in the PbO containing glasses was approximately the same (≈ 63 and 22 % respectively). However, the percentage of weakly H-bonded OH and free OH was lower in the GeO2 containing glass than the PbO containing glasses (≈ 75 and 13 % respectively). Infrared spectroscopy of glasses of the series (90-x)TeO2-10Na2O-xZnO Fig. (6.12) shows infrared spectra of glass of the series (90-x)TeO2-10Na2O-xZnO, for x = 12 mol. % (MOD007) and x = 10 mol. % (MOD013).
6. Optical properties; MDO 190 Absorption coefficient / cm -1 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0.00 Wavelength / µm 6 5 4 3 2 2000 3000 4000 5000 6000 Wavenumber / cm -1 (90-x)TeO 2 -xZnO-10Na 2 O MOD007 (12 mol. % ZnO) MOD013 (10 mol. % ZnO) Fig. (6.12): Infrared spectra of glass of the series (90-x)TeO2-10Na2O-xZnO, for x = 12 mol. % (MOD007) and x = 10 mol. % (MOD013). Again, the multiphonon edge for these glasses occurred at around 1667 cm -1 (6 µm) and hydroxide (OH) bands occurred at around 3000 cm -1 (3.33 µm) and 2270 cm -1 (4.41 µm). Fig. (6.13) shows the infrared spectra in the mid- and far-infrared regions for glasses of composition 80TeO2-10Na2O-10ZnO mol. %, performed on samples of varying thickness viz. 2.98, 0.50 and 0.20 mm. Due to the high extinction coefficients of fundamental absorption bands, thin samples were used to make these more distinguishable. 2000 1750 1500 1250 1000 750 500 250 0 Loss / dB.m -1
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Percentage (%)<br />
80<br />
70<br />
60<br />
50<br />
40<br />
30<br />
20<br />
10<br />
0<br />
6. Optical properties; MDO 189<br />
Strong OH Weak OH Free OH<br />
OH type<br />
MOD006 (3 mol. % PbO) MOD010 (5 mol. % PbO) MOD012 (5 mol. % GeO2)<br />
Fig (6.11): Percentage of OH groups in glass series (80-x)TeO2-10Na2O-10ZnO-xMO,<br />
where MO is PbO or GeO2, for MOD006 (x = 3 mol. % PbO), MOD010 (x = 5 mol. %<br />
PbO) and MOD012 (x = 5 mol. % GeO2).<br />
It can be seen that the percentage of strongly H-bonded OH in all three glasses was<br />
approximately the same, ≈ 14 %. The percentage of weakly H-bonded OH and free OH in<br />
the PbO containing glasses was approximately the same (≈ 63 and 22 % respectively).<br />
However, the percentage of weakly H-bonded OH and free OH was lower in the GeO2<br />
containing glass than the PbO containing glasses (≈ 75 and 13 % respectively).<br />
Infrared spectroscopy of glasses of the series (90-x)TeO2-10Na2O-xZnO<br />
Fig. (6.12) shows infrared spectra of glass of the series (90-x)TeO2-10Na2O-xZnO, for x<br />
= 12 mol. % (MOD007) and x = 10 mol. % (MOD013).
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