Abstract
On the basis of DTA analyses, three (1-x)TeO2-xLiCl (x = 0.3, 0.35 and 0.4 mol) glasses doped with 0.005 mol of Tm2O3 were crystallized in the vicinity of 400 °C. X-ray investigations for samples heated to 425 °C (above the peak crystallization temperature) followed by quenching in air, revealed the presence of the paratellurite (TeO2) as the only crystallizing phase in all glass compositions. SEM investigations revealed that the paratellurite crystals formed in these glasses as a result of surface crystallization were trigonal in shape, between 40 and 50 μm in length, 7 and 15 μm in width and 5 and 9 μm in depth. DTA analyses were carried out on the 0.7TeO2-0.3LiCl glass at different heating rates and an activation energy value of 238 kJ/mol for surface crystallization was determined graphically from a Kissinger-type plot using the analysis of Matusita and Sakka.
| Original language | English |
|---|---|
| Pages (from-to) | 177-183 |
| Number of pages | 7 |
| Journal | Journal of the European Ceramic Society |
| Volume | 21 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Feb 2001 |
Funding
The authors would like to express their gratitude to Prof. Dr. D. Ülkü for serving as technical advisor for the TTGV-180/S (Technology Development Foundation of Turkey) project out of which this investigation has emerged. We also acknowledge the help and contribution of Ms. Nurten Dinçer during the SEM and DTA investigations of this study. This research has been partially supported by the Research Foundation of Istanbul Technical University under the contract number 594.
| Funders | Funder number |
|---|---|
| Istanbul Teknik Üniversitesi | 594 |