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.

本课题由Sindee L。西蒙和格雷戈里B。德克萨斯理工大学的McKenna将使用量热法、动态热光谱、剪切和体流变学以及纳米流变学来研究硒化物基硫属化物玻璃的弛豫动力学。 三个重要的科学问题得到解决：玻璃的稳定性，相对于老化附近和中间相区域，纳米约束和压力的动态的影响，和起源的不寻常的机械硬化的玻璃膜。 特别感兴趣的是测量的焓恢复和蠕变老化过程中作为一个功能的组成，温度和老化时间，旨在更全面地了解这些玻璃的稳定性的组成依赖性。 更广泛的影响包括培训两名研究生，将新材料纳入方案研究所教授的课程，以及向五年级至十一年级的年轻学生推广，通过针对小学生的“超级星期六”充实计划和针对初中和高中生的夏季“科学--这是女孩的事情”计划，硫族化物玻璃的物理和化学稳定性在它们的许多潜在应用中是重要的，包括作为存储器件、光波导和太阳能电池。 通过增加对布尔昌德中间相的理解，其具有增强的稳定性，预期结果将促进用于此类应用的稳定硫族化物玻璃的合成。