Tellurite And Fluorotellurite Glasses For Active And Passive

6. Optical properties; MDO 188
Table (6.1) summarises the positions (P), half-widths (W), and areas (A) of these bands.
Table (6.1): Position (P), half-widths (W), and areas (A) of OH groups for 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).
Glass Strong OH Weak OH Free OH
MOD P /
ID cm -1
W /
cm -1
A /
(cm -1 ) 2
P /
cm -1
W /
cm -1
A /
(cm -1 ) 2
P /
cm -1
W /
cm -1
A /
(cm -1 ) 2
006 2264 240 62 2885 458 287 3235 326 101
010 2257 313 77 2895 437 310 3283 337 107
012 2255 256 86 2950 548 534 3299 288 91
From table (6.1), the area of each band is proportional to the concentration of the
absorbing species in the glass. Therefore, the areas can be used to calculate the fraction of
each type of OH present in the glass, assuming each type has approximately equal
extinction coefficients. Table (6.2) and fig. (6.11) summarise this.
Table (6.2): 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).
Glass Strong Weak Free
MOD ID OH / % OH / % OH / %
006 14 64 22
010 16 63 22
012 12 75 13