Relaxation Dynamics in Selenide-Based Chalcogenide Glasses: Characterization of the Intermediate Phase

硒化物硫系玻璃中的弛豫动力学：中间相的表征

• 批准号: 1112416
• 负责人: Sindee Simon
• 金额: $ 30万
• 依托单位: Texas Tech University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-08-01 至 2015-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1112416&HistoricalAwards=false
• 关键词: Relaxation; Dynamics; Selenide; Based; Chalcogenide

In this project funded by the Chemical Structure, Dynamics, and Mechanisms Program of the Chemistry Division, Sindee L. Simon and Gregory B. McKenna of Texas Tech University will investigate the relaxation dynamics in selenide-based chalcogenide glasses using calorimetry, dynamic heat spectroscopy, shear and bulk rheology, and nanorheology. Three important scientific issues are addressed: the stability of the glasses with respect to aging near and in the intermediate phase region, the effects of nanoconfinement and pressure on the dynamics, and the origin of the unusual mechanical stiffening of ultrathin films. Of particular interest is the measurement of enthalpy recovery and creep during aging as a function of composition, temperature, and aging time aimed at a more complete understanding of the composition dependence of the stability of these glasses. Broader impacts include training of two graduate students, incorporation of new material into courses taught by the PIs, and outreach to young students, from fifth through eleventh grades, through a "Super Saturdays" enrichment program for grade-school children and a summer "Science - It's a Girl Thing" program for junior-high and high-school girls.The physical and chemical stability of chalcogenide glasses are important in many of their potential applications, including as memory devices, optical waveguides, and solar cells. By increasing understanding the Boolchand intermediate phase, which has enhanced stability, the results are anticipated to facilitate synthesis of stable chalcogenide glasses for such applications.

在该项目中，由化学结构，动力学和机制计划资助，德州理工大学的Sindee L. Simon和Gregory B. McKenna将使用量热法，动态热光谱，剪切和散热器和块状晶状体，以及纳米素学研究基于硒化的基于硒化的硫化核化合物玻璃的放松动力学。 解决了三个重要的科学问题：玻璃在近距离和中间相位区域的衰老方面的稳定性，纳米配置和压力对动力学的影响以及超薄膜的异常机械僵硬的起源。 特别感兴趣的是在衰老过程中测量焓恢复和蠕变，这是旨在更完整地了解这些玻璃稳定性的组成依赖性的组成，温度和衰老时间的函数。 更广泛的影响包括对两名研究生的培训，将新材料纳入由PI教授的课程中，以及向年轻学生（从五年级到十一年级的年轻学生）通过“超级星期六”的“超级星期六”丰富计划和夏季的“科学”和“这是一项针对初级和高级学校的女孩”计划的夏季“科学”计划。光学波导和太阳能电池。 通过增加了解稳定性增强的布尔琴中间阶段，预计结果可以促进稳定的奶油蛋白酶玻璃的合成。