Statics and Dynamics of Spatially and Dimensionally Constrained Oxides

空间和尺寸约束氧化物的静力学和动力学

• 批准号: 1507810
• 负责人: Vinayak Dravid
• 金额: $ 47.82万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-08-01 至 2019-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1507810&HistoricalAwards=false
• 关键词: Statics; Dynamics; Spatially; Dimensionally; Constrained

NON-TECHNICAL DESCRIPTION: The past couple decades have witnessed remarkable advances in nanostructured and multifunctional ceramic oxides to harness their unusual non-linear properties. Ferroelectric (FE) and ferromagnetic (FM) oxides, in particular, have received considerable attention due to their technological prospects for non-volatile memories and storage media, respectively. However, there remain many open questions in term of the detailed understanding of FE and FM phenomena as a function of their dimensional parameters and the nature of the interfaces. This project addresses innovative patterning approaches for creating nanoscale architecture of multifunctional oxides, and the role of spatial and dimensional confinement. The research is expected to provide predictive strategies and design rules for nanopatterned oxides for harnessing their useful properties. The project also involves experiential and immersion opportunity for journalism students to follow the process of creativity in scientific pursuits, and for science and engineering students to learn about the process of reporting and communication. TECHNICAL DETAILS: The scientific underpinning of the research revolves around understanding of the decisive role of spatial and dimensional constraints on microstructural evolution, localized characteristics of interfaces, and size/shape-specific properties/phenomena in FE/FM oxides. Embedded in the scientific quest are nanopatterning techniques for complex oxides. Innovative hybrid approaches based on beam-pen lithography (BPL) are coupled to soft chemistry (sol-gel) to generate large area oxide nanopatterns. This approach is necessary to address critical scientific issues associated with phase transformation (crystallization) and phase separation under confinement. Advanced techniques of X-ray scattering and electron microscopy are expected to unravel, down to atomic scale, the nature of interfaces between substrate and nanopattern and the dynamics of ferroelectricity and magnetism as a function of nanopattern parameters and substrate constraints. The research students, including graduate students and undergraduate interns, are trained in advanced microscopy and characterization tools and techniques which are essential for modern materials developments.

非技术描述：过去几十年来，在纳米结构和多功能陶瓷氧化物中取得了显着进步，以利用其异常的非线性特性。铁电（Fe）和铁磁（FM）氧化物，特别是由于它们对非挥发性记忆和储存介质的技术前景，因此受到了极大的关注。但是，关于Fe和FM现象的详细理解，仍然存在许多开放问题，这是其维度参数和接口的性质的函数。该项目介绍了创新的模式方法，用于创建多功能氧化物的纳米级体系结构，以及空间和维限制的作用。预计该研究将为纳米平淡的氧化物提供预测策略和设计规则，以利用其有用的特性。该项目还涉及新闻业学生在科学追求中遵循创造力的过程，以及科学和工程专业的学生学习报告和沟通过程。技术细节：研究的科学基础围绕着对空间和维度约束对微结构进化的决定性作用的理解，界面的局部特征以及Fe/FM氧化物中的大小/形状特异性/现象/现象。嵌入在科学任务中的是复杂氧化物的纳米图案技术。基于光束式光刻（BPL）的创新杂种方法与软化学（SOL-GEL）耦合，以生成大面积氧化物纳米模式。这种方法对于解决与相变（结晶）和隔离相关相关的关键科学问题是必要的。 X射线散射和电子显微镜的先进技术预计将拆开，直至原子量表，基板和纳米图案之间的接口性质，以及铁电和磁性的动力学，作为纳米图案参数的函数和底物约束。包括研究生和本科实习生在内的研究专业的研究生接受了高级显微镜和表征工具和技术的培训，这对于现代材料开发至关重要。