Dynamics and Structure of New Chalcogenide Glasses: Nanoscale Effects of Time and Length

马丁9420651 新的重碱金属和轻碱土金属硫代硼酸盐玻璃将首次制备和表征。 虽然与类似的氧化物硼酸盐具有一些相似性，但这些玻璃具有显著的差异，例如与碱金属氧化物硼酸盐玻璃的两个四面体硼相比，每添加一个硫化物阴离子形成六至八个四面体硼的形成速率。 本研究将探讨中程有序的奈米长度尺度效应与玻璃物理性质之间的关系。 拉曼、核四极共振和中子散射光谱将用于探测更长距离的结构。 纳秒时间尺度测量（千兆赫兹频率）的电导率和核自旋晶格弛豫将被用来探测这些属性之间的关系，所产生的阳离子跳跃动力学在这些快速离子导电玻璃。 将尝试开发一类新的化学稳定的快速离子传导玻璃，推动这些材料在电化学应用中的适用性。 拟议中的研究旨在更深入地探索玻璃的结构，长尺度，并更远地回到阳离子运动的动力学，更短的时间尺度，比以往任何时候都更深。 这些毛藻玻璃提供了一个近乎完美的模板，可以在上面进行这些实验。 将制备和表征新的重碱金属和轻碱土金属硫代硼酸盐玻璃。 该研究旨在探索纳米长度尺度效应与玻璃物理性质之间的关系。 ***

Martin 9420651 New Heavy alkali and light alkaline earth thioborate glasses will be prepared and characterized for the first time. While having some similarity to the analogous oxide borates, these glasses have striking differences, such as the formation rate of six to eight tetrahedral borons per every added sulfide anion compared to two tetrahedral borons for the alkali oxide borate glasses. This research will explore the relationship between nanometer length scale effects of intermediate-range order and physical properties of glass. Raman, Nuclear Quad Resonance, and neutron scattering spectroscopies will be used to probe longer range structures. Nanosecond time scale measurements (Giga hertz frequencies) of the conductivity and of nuclear spin lattice relaxation will be used to probe the relationship between these properties that arise from cationhopping dynamics in these fast ion conducting glasses. An attempt will be made to develop a new class of chemically robust fast ion conducting glasses that push the suitability envelope for these materials in elechochemical applications. The proposed research seeks to probe deeper into the structure of glass, long length scales, and farther back into the dynamics of cation motion, shorter time scales, than ever before. These chaecognide glasses provide a nearly perfect template upon which these experiments can be staged. %%% New heavy alkali and light alkaline earth thioborate glasses will be prepared and characterized. The research will be aimed to explore the relationship between nanometer length scale effects and physical properties of glasses. ***