Tellurite And Fluorotellurite Glasses For Active And Passive

[Zn(OH,F)F] / mol. %
7. Surface properties; MDO 308
100
90
80
70
60
50
40
30
20
10
0
Untreated Fluorinated
Zn(OH)F ZnF2
Fig. (7.38): Mol. % of ZnF2 and Zn(OH)F before and after fluorination .
7.3.1.2. XPS of oxide tellurite glasses
A number of studies have been performed on the XPS spectra of tellurite glasses [8-19].
Fig. (7.7) to (7.10) show the XPS spectra of glass MOD015 (82.5TeO2-7.5WO3-10Nb2O5
mol. %). Fig. (7.8) shows the asymmetry of the high resolution scan of the O1s peak.
Himei et al. [8] studied the XPS spectra of alkali-tellurite glasses, and only observed O1s
peak asymmetry in uncleaved samples, and attributed this high energy shoulder to OH
groups on the glass surface (O1s binding energy around 533 eV for Al(OH)3). As glass
MOD015 was cleaved in the laboratory atmosphere, some hydrolysis would have
occurred in addition to the OH contained in the bulk of the glass, indicating this peak at