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Tellurite And Fluorotellurite Glasses For Active And Passive

Tellurite And Fluorotellurite Glasses For Active And Passive

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4. Thermal properties and glass stability; MDO 105<br />

mol. %) and MOF008 (85TeO2-10Na2O-5ZnF2 mol. %) This glass melting series obeys<br />

the composition rule (90-x)TeO2.xZnF2.10Na2O (mol. %), for 5 ≤ x ≤ 30.<br />

<br />

o C<br />

MOF001<br />

MOF004<br />

MOF005<br />

MOF006<br />

MOF007<br />

MOF008<br />

100 200 300 400 500<br />

Temperature / o C<br />

Fig (4.14): DTA traces of glasses MOF001 (65TeO2-10Na2O-25ZnF2 mol. %), MOF004<br />

(60TeO2-10Na2O-30ZnF2 mol. %), MOF005 (70TeO2-10Na2O-20ZnF2 mol. %),<br />

MOF006 (75TeO2-10Na2O-15ZnF2 mol. %), MOF007 (80TeO2-10Na2O-10ZnF2 mol. %)<br />

and MOF008 (85TeO2-10Na2O-5ZnF2 mol. %) [10].<br />

It can be seen from these curves that the glass transition temperature falls with increasing<br />

fluoride and the Tx-Tg gap widens, thus the glass becomes more stable. Fig. (4.15)<br />

illustrates this.

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