CAREER: Effects of Anelastic Relaxation of Defect Complexes on the Mechanical Behavior of Oxide Ceramics

职业：缺陷复合体的滞弹性弛豫对氧化物陶瓷机械行为的影响

• 批准号: 1057155
• 负责人: Miladin Radovic
• 金额: $ 45万
• 依托单位: Texas A&M Engineering Experiment Station
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-07-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1057155&HistoricalAwards=false
• 关键词: CAREER; Effects; Anelastic; Relaxation; Defect

NON-TECHNICAL DESCRIPTION: Oxide ceramics with high ionic or mixed ionic-electronic conductivity are currently essential materials for highly-efficient and environmentally-friendly energy technologies, including solid oxide fuel cells and batteries. The project addresses, on a fundamental level, the relationship between atomic defects in oxide ceramics and their mechanical behavior under the combined effects of elevated temperature and mechanical stresses. The results of this project are expected to advance significantly the knowledge on formation and interaction of atomic defects in oxides that is needed today for further development of reliable and durable devices for energy generation, transformation, and storage. This project integrates research, educational and outreach activates that are focused on understanding complex behavior of oxides under extreme conditions, with an emphasis on involving graduate, undergraduate, K-12 students and underrepresented groups in research on novel materials for energy applications. TECHNICAL DETAILS: Although, significant progress has been achieved in understanding the chemistry, structure and kinetics of point defects in oxides and their effect on transport properties, the behavior of point defects under applied loads and their effects on temperature-dependant mechanical properties remain elusive. The main objective of the project is to quantify experimentally the effects of type, concentration and association of point defects on the mechanical properties in pure and doped binary and ternary oxides ceramics with high ionic or mixed ionic-electronic conductivity. Furthermore, this project contributes to the theory of point defects in ceramics and generates a more comprehensive understanding of the role that these defects have on mechanical behavior by linking experimental results to structure, chemistry and point defects interactions under different conditions. New experimental and computational tools are utilized in this project to better rationalize relationship between structural and thermo-mechanical properties of oxides at elevated temperatures. The grant further strengthens the educational and research experience of students through their close involvement in hands-on research and development of new courses in areas of materials science and renewable energy.

非技术描述：具有高离子或混合离子-电子电导率的氧化物陶瓷是目前高效和环保能源技术的基本材料，包括固体氧化物燃料电池和电池。该项目从根本上解决了氧化物陶瓷中的原子缺陷与其在高温和机械应力综合作用下的机械行为之间的关系。该项目的结果预计将显着推进对氧化物中原子缺陷的形成和相互作用的知识，这是今天需要进一步开发可靠和耐用的能源生产，转换和存储设备。该项目整合了研究，教育和推广活动，重点是了解极端条件下氧化物的复杂行为，重点是让研究生，本科生，K-12学生和代表性不足的群体参与能源应用新材料的研究。 技术规格：虽然，在理解氧化物中点缺陷的化学、结构和动力学以及它们对输运性质的影响方面已经取得了重大进展，但是点缺陷在施加载荷下的行为以及它们对温度依赖性机械性质的影响仍然难以捉摸。该项目的主要目标是通过实验量化点缺陷的类型、浓度和相关性对具有高离子或混合离子-电子电导率的纯和掺杂二元和三元氧化物陶瓷的机械性能的影响。此外，该项目有助于陶瓷中的点缺陷理论，并通过将实验结果与不同条件下的结构，化学和点缺陷相互作用联系起来，更全面地了解这些缺陷对机械行为的作用。在这个项目中使用新的实验和计算工具，以更好地合理化氧化物在高温下的结构和热机械性能之间的关系。 该补助金进一步加强了学生的教育和研究经验，通过他们在材料科学和可再生能源领域的新课程的动手研究和开发的密切参与。