Tellurite And Fluorotellurite Glasses For Active And Passive

6. Optical properties; MDO 213
Absorption coefficient / cm -1
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
Wavelength / µm
5.0 4.5 4.0 3.5 3.0
Baseline: y=[1470/x]^4+0.311
Chi^2 = 0.00003
R^2 = 0.99559
y0 0 ±0
xc1 2241.3597 ±1.25203
w1 187.0591 ±2.55137
A1 15.92097 ±0.19134
xc2 2900.49667 ±5.16159
w2 401.65945 ±5.35592
A2 112.56958 ±2.84993
xc3 3243.95319 ±5.55467
w3 327.52301 ±5.15369
A3 56.36328 ±2.81618
FTIR data
Gaussian fit
Strong OH (2241 cm -1 )
Weak OH (2900 cm -1 )
Free OH (3244 cm -1 )
2000 2200 2400 2600 2800 3000 3200 3400 3600
Wavenumber / cm -1
Fig. (6.41) shows the Gaussian deconvolution of the OH bands in glass MOF013
(65TeO2-25ZnO-10Na2O mol. %).
It can be seen that the ZnF2 containing glasses (fig. (6.37) to (6.40)) did not exhibit a
strongly H-bonded OH band, whereas the oxide glasses did (fig. (6.41)).
Fig. (6.42) shows the variation of OH band height peak absorbance at around 2900
cm -1 (weakly H-bonded OH) with increasing ZnO / ZnF2 ratio. Table (6.9) summarises
the positions (P), half-widths (W), and areas (A) of these bands.
350
300
250
200
150
100
50
0
Loss / dB.m -1