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：在过去的几十年里，纳米结构和多功能陶瓷氧化物已经取得了显着的进展，以利用其不寻常的非线性特性。特别是铁电（FE）和铁磁（FM）氧化物，由于它们分别用于非易失性存储器和存储介质的技术前景而受到相当大的关注。然而，仍然有许多悬而未决的问题，在详细了解FE和FM现象作为其尺寸参数和接口的性质的函数。该项目致力于创造多功能氧化物的纳米级结构的创新图案化方法，以及空间和尺寸限制的作用。这项研究有望为纳米图案化氧化物提供预测策略和设计规则，以利用其有用的特性。该项目还包括体验和沉浸的机会，让新闻专业的学生在科学追求中遵循创造力的过程，并让科学和工程专业的学生了解报道和沟通的过程。技术规格：该研究的科学基础围绕着理解空间和尺寸约束对微结构演变的决定性作用，界面的局部特征，以及FE/FM氧化物的尺寸/形状特定的特性/现象。在科学探索中嵌入的是复杂氧化物的纳米图案技术。基于束笔光刻（BPL）的创新混合方法与软化学（溶胶-凝胶）相结合，以生成大面积氧化物纳米粒子。这种方法是必要的，以解决关键的科学问题与相变（结晶）和相分离下的约束。X射线散射和电子显微镜的先进技术预计将在原子尺度上解开衬底和纳米图案之间界面的性质以及铁电性和磁性的动态特性与纳米图案参数和衬底约束的函数关系。研究生，包括研究生和本科实习生，接受先进的显微镜和表征工具和技术的培训，这些工具和技术对现代材料的发展至关重要。