Tellurite And Fluorotellurite Glasses For Active And Passive

4. Thermal properties and glass stability; MDO 104
These compositions showed Tg values at 337°C, 367°C and 366°C for glasses MOD014
to MOD015 respectively. Glasses MOD014 and MOD015 also exhibit crystallisation
peaks at 456°C and 526°C respectively giving Tx-Tg values of 119°C and 159°C.
Table (4.1) summarises the characteristic temperatures of melts MOD001, 002, 006 to
MOD016, inclusively.
Table (4.1): Characteristic temperatures for oxide tellurite glasses (see table (3.1)).
MOD ID Tg / °C Tx / °C (Tx-Tg) / °C
001 274 329 55
002 288 373 85
006 282 - -
007 286 447 161
008 289 - -
009 292 - -
010 281 - -
011 266 343 77
012 296 460 164
013 281 389 108
014 337 456 119
015 367 526 159
016 366 - -
4.2.2. DTA traces of fluorotellurite glasses
Effect of ZnF2 on the series (90-x)TeO2.xZnF2.10Na2O (mol. %), for 5 ≤ x ≤ 30
Fig. (4.14) shows DTA traces of glasses MOF001 (65TeO2-10Na2O-25ZnF2 mol. %),
MOF004 (60TeO2-10Na2O-30ZnF2 mol. %), MOF005 (70TeO2-10Na2O-20ZnF2 mol.
%), MOF006 (75TeO2-10Na2O-15ZnF2 mol. %), MOF007 (80TeO2-10Na2O-10ZnF2