10.06.2013 Views

Tellurite And Fluorotellurite Glasses For Active And Passive

Tellurite And Fluorotellurite Glasses For Active And Passive

Tellurite And Fluorotellurite Glasses For Active And Passive

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

8. Fibre drawing; MDO 339<br />

8.2. Results<br />

8.2.1. Viscosity (TMA)<br />

Fig. (8.4) shows the viscosity / temperature behaviour of glasses MOF001 (65TeO2-<br />

10Na2O-25ZnF2 mol. %) and MOF005 (70TeO2-10Na2O-20ZnF2 mol. %) [9].<br />

Log10( η<br />

η) / Pa.s<br />

7.5<br />

7.0<br />

6.5<br />

6.0<br />

5.5<br />

5.0<br />

Fig. (8.4): Viscosity / temperature behaviour of glasses MOF001 (65TeO2-10Na2O-<br />

25ZnF2 mol. %) and MOF005 ((70TeO2-10Na2O-20ZnF2 mol. %) [9].<br />

It can be seen the viscosity decreased for a given temperature with increasing batched<br />

ZnF2 in the glass. Fig. (8.5) and (8.6) shows the modelling for these glasses. The dashed<br />

lines show Tg measured by DTA (see table (4.2)), and the fibre drawing viscosity (10 4.5<br />

Pa.s) [9].<br />

270 280 290 300 310 320 330<br />

Temperature / o C<br />

⎯ 20 mol. % ZnF2 (core)<br />

⎯ 25 mol. % ZnF2 (clad)

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!