Molecular Structure of Tellurium-Based Optical Glasses and Liquids by Spectroscopy and Calorimetry

本文将利用穆斯堡尔光谱、拉曼光谱和量热法研究两种新型碲基光学玻璃的分子结构。将碱性碲酸盐和碱土碲酸盐与锗合金化，以改变这些非晶态材料的玻璃化转变温度。相应的玻璃熔体的脆性将通过粘度、焓、活化能和热膨胀测量来确定。结果将与从光谱中推断出的玻璃分子结构有关。特别令人感兴趣的是探针离子（碘和碲）周围的平均配位。在基本层面上，目前的玻璃提供了方便的系统来进一步探索最近提出的玻璃共价网络中刚性渗透与相应熔体脆性之间的相关性。在应用水平上，目前的推力为确定它们在光学应用上的可行性提供了基础。

The molecular structure of two new classes of tellurium-based optical glasses will be investigated using Mossbauer spectrosopy, Raman spectroscopy, and calorimetry. The alkaline and alkaline- earth tellurates will be alloyed with germanium to modify the glass transition temperatures of these amorphous materials. The fragility of corresponding glassy melts will be established by viscosity-and enthalpy-activation energies and thermal expansion measurements. The results will be correlated with aspects of glass molecular structure deducted from spectroscopy. Of particular interest is the average coordination around the probe ions (iodine and tellurium). On a basic level, the present glasses provide convenient systems to explore further the recently suggested correlation between rigidity percolation in glassy covalent networks and fragility of corresponding melts. On an applied level, the present thrust provides a basis to determine their viability for optical applications.