Entropy stabilized complex oxides

熵稳定的复合氧化物

• 批准号: 1610844
• 负责人: Jon-Paul Maria
• 金额: $ 55.22万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-07-01 至 2018-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1610844&HistoricalAwards=false
• 关键词: Entropy; stabilized; complex; oxides

NON-TECHNICAL DESCRIPTION: This project addresses the ongoing challenge to discover new materials that respond to societal needs through the new and interesting properties they provide, and the new scientific information that they reveal. The world depends upon a rapidly evolving set of modern technologies that are routinely enabled by advanced materials. Maintaining this progress requires an ever-expanding set of candidates that accompany and facilitate new designs. Currently, the research community at large is engaged in this process, and is doing so in many cases using the power of computational tools. The present activity is investigating an alternative strategy where configurational entropy - engineered by composition - is used to imagine and create a new class of solid crystals. While the approach is generic to all material types, this research focuses on oxide ceramics, with particular attention to those interesting to electronic applications. During the course of research, it is likely that new materials of importance to energy storage and microelectronic devices will result from this work.TECHNICAL DETAILS: This project is exploring how configurational disorder can be engineered through composition so the entropic contributions to free energy predominate the minimization and thus stabilization process. Specific objectives include quantifying the strength of entropic stabilization, extending the stabilization concept to ternary systems, using thin film deposition techniques to quench in extreme high entropy structures, and exploring how configurational entropy can influence phase transformations. This research is an important complement to modern computation-led efforts such as the Materials Genome Initiative, which address the grand challenge of finding new materials that become the foundation of new technologies. Current indications suggest that entropic stabilization is prominent in oxides and that many new phases and thus new opportunities for new properties are present. If so, the impacts will be transformational as a new avenue for material development will be presented to the research community. A full-time graduate student and part-time (between semesters) undergraduate student is supported and mentored. The students and PI are participating in regional activities that encourage pre-college student engagement in science and engineering, and thus contribute to a robust and diverse future scientific cohort.

非技术描述：该项目解决了正在进行的挑战，即通过他们提供的新有趣的属性以及他们揭示的新科学信息来发现对社会需求的新材料。世界取决于一组快速发展的现代技术，这些技术通常由高级材料实现。保持这一进展需要一组不断扩大的候选人，这些候选人伴随并促进新设计。当前，整个研究社区正在参与此过程，并且在许多情况下都使用计算工具的力量。目前的活动正在研究一种替代策略，其中配置熵（由组成设计）用于想象和创建一类新的实心晶体。尽管该方法对所有材料类型都是通用的，但本研究的重点是氧化陶瓷，特别关注那些对电子应用有趣的人。在研究过程中，这项工作可能会导致对储能和微电动设备重要的新材料。技术细节：该项目正在探索如何通过组成来设计构型疾病，从而使自由能量的贡献促进自由度贡献最小化和稳定过程。特定目标包括量化熵稳定的强度，将稳定概念扩展到三元系统，使用薄膜沉积技术在极端高熵结构中淬灭，并探索配置熵如何影响相变。这项研究是对现代计算领导的努力（例如材料基因组计划）的重要补充，该计划应对寻找成为新技术基础的新材料的巨大挑战。当前的迹象表明，熵稳定在氧化物中是突出的，并且存在许多新阶段，因此存在新的特性的新机会。如果是这样，这些影响将是一种变革性的，因为新的材料开发途径将介绍给研究界。支持和指导的专职研究生和兼职（在学期之间）的本科生。学生和PI正在参加鼓励学生参与科学和工程学的区域活动，从而有助于强大而多样化的未来科学队列。