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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 102<br />

Crystallisation and melting peaks were not as clearly discernable for these compositions<br />

compared to glasses MOD001 and MOD002 due to increased glass stability. Tg occurred<br />

at 282°C, 286°C, 289°C and 292°C for MOD006 to MOD009 respectively. The only<br />

prominent crystallisation peak can be seen for MOD007 at 447°C, giving this glass a Tx-<br />

Tg of 161°C.<br />

Fig. (4.12) shows DTA traces for glasses MOD010 (75TeO2-10ZnO-10Na2O-5PbO<br />

mol. %), MOD011 (70TeO2-10ZnO-10Na2O-10PbO mol. %), MOD012 (75TeO2-<br />

10ZnO-10Na2O-5GeO2 mol. %) and MOD013 (80TeO2-10ZnO-10Na2O mol. %).<br />

<br />

o C<br />

200 300 400 500 600 700<br />

Temperature / o C<br />

MOD010 MOD011<br />

MOD012 MOD013<br />

Fig. (4.12): DTA traces for glasses MOD010 (75TeO2-10ZnO-10Na2O-5PbO mol. %),<br />

MOD011 (70TeO2-10ZnO-10Na2O-10PbO mol. %), MOD012 (75TeO2-10ZnO-10Na2O-<br />

5GeO2 mol. %) and MOD013 (80TeO2-10ZnO-10Na2O mol. %).

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