Thermal and mechanical properties of tellurite glasses for mid-IR molded glass lens applications

摘要

In the present study, zinc molybdenum tellurite glasses with the molar composition of (l-x)TeO_2-yMoO_3-xZnO and (l-x)TeO_2-yMoO_3-xZnO, where x = 10, 20, and 30 mol%, and y = 10 and 20 mol%, were prepared by a high temperature melt quenching technique and studied their thermal, thermo-mechanical and mechanical properties. From the thermal analysis, it was found that the glass transition (T_g), crystallization (T_x) and stability parameters slightly increased with increase in ZnO content in both series of glasses. Thermal expansion coefficient decreases from 16.56 to 14.67×10~(-6)/K as the ZnO content increases from 10 to 30 mol%. Knoop hardness slightly decreases from 307 to 290 kgf/mm~2 with increase in ZnO content from 10 to 30 mol% for 10 mol% of MoO_3 content, whereas it increases for 20 mol% of MoO_3. Based on the results, it concludes that the number of bridging oxygens and network compactness of tellurite matrix increased with increase in ZnO content varied from 10 to 30 mol%.