CAREER: Novel Ceramic Nanocomposites with Smart Interface Design

职业：具有智能界面设计的新型陶瓷纳米复合材料

• 批准号: 0846504
• 负责人: Haiyan Wang
• 金额: $ 40万
• 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: 2009
• 资助国家: 美国
• 起止时间: 2009-06-01 至 2016-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0846504&HistoricalAwards=false
• 关键词: CAREER; Novel; Ceramic; Nanocomposites; Smart

NON-TECHNICAL DESCRIPTION: The CAREER program explores the fundamental interface control in ceramic nanocomposite thin films which allow the design of nanostructures with new or significantly improved materials properties. This study will have direct impact on processing high temperature superconductor (HTS) YBa2Cu3O7-ä (YBCO)-coated conductors with high critical current density in both self-field and in-field for many envisioned applications. The fundamental knowledge gained will also illuminate the interfacial phenomena observed in many other ceramic nanocomposite systems with heterogeneous interfaces, such as microelectronic and optoelectronic devices, thin film solid oxide fuel cells (SOFC), thin film solar cells and etc.. The research program will integrate with the following educational objectives: (1) to develop a teaching model "The Art of Laying Apples" for the PI's thin film classes; (2) to offer a multidisciplinary training to undergraduate and graduate students at Texas A&M University (TAMU), and at Los Alamos National Laboratory and the University of Houston through collaboration; and (3) to disseminate the research results to a much broader audience by (a) involving high school teachers in the research project through a summer research program at TAMU; and (b) involving under-represented groups into materials science and engineering through the Women Engineering Forum and the Women Mentor Program at TAMU and the Los Alamos Summer School (LASS) at the University of New Mexico.TECHNICAL DETAILS: This CAREER project addresses fundamental materials science research on the synthesis, characterization and engineering of heterogeneous interfaces in epitaxial ceramic nanocomposites. This project explores misfit dislocations and associated defects commonly observed at heteroepitaxial interfaces in ceramic nanocomposites, and studies their impacts on material functionalities. The material systems selected for this study are nanolayered and nanoparticle-doped YBCO. The goal is to understand interface control in epitaxial nanocomposite ceramic thin films, with the objective to engineer the interfaces for unique functionalities. First, a thorough microstructural characterization will be performed on nanolayered systems where strong interfacial effects have already been observed. A combination of various atomic-scale characterization tools including high-resolution transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM) and electron energy loss spectroscopy (EELS) analysis will be employed to identify misfit dislocations and associated defects at the interfaces. Second, a systematic study to correlate the misfit dislocation density and the flux-pinning property will be conducted on YBCO nanocomposite thin films. Finally, a novel 2D ordered nanoparticle array confined by the 2D misfit dislocation array is proposed. All the YBCO nanocomposite thin films will be prepared by pulsed laser deposition (PLD) at TAMU. Various characterization techniques, such as high resolution XRD, TEM (combined with STEM and EELS compositional analysis), as well as transport property measurements will be utilized to investigate the structural and flux-pinning properties of these YBCO nanocomposite systems.

非技术描述：职业计划探讨了陶瓷纳米复合薄膜中的基本接口控制，这些薄膜允许设计具有新的或显着改进的材料特性的纳米结构。这项研究将直接影响处理高温超导体（HTS）YBA2CU3O7-ä（YBCO）涂层的导体，对于许多设想的应用，在自场和现场的临界电流密度高。所获得的基本知识还将照亮许多其他具有异质界面的陶瓷纳米复合系统中观察到的界面现象，例如微电源和光电设备，薄膜固体氧化物氧化物燃料电池（SOFC），薄膜太阳能细胞，薄膜太阳能细胞等。 Pi的薄膜课； （2）通过合作，为德克萨斯A＆M大学（TAMU）的本科和研究生提供多学科培训，并通过合作在洛斯阿拉莫斯国家实验室和休斯敦大学提供跨学科培训； （3）通过（a）通过在TAMU的夏季研究计划参与研究项目的（a）将研究结果传播给更广泛的受众； and (b) involving under-represented groups into materials science and engineering through the Women Engineering Forum and the Women Mentor Program at TAMU and the Los Alamos Summer School (LASS) at the University of New Mexico.TECHNICAL DETAILS: This CAREER project addresses fundamental materials science research on the synthesis, characterization and engineering of heterogeneous interfaces in epitaxial ceramic nanocomposites.该项目探讨了属性脱位和相关的缺陷，通常在陶瓷纳米复合材料的杂田界面上观察到的缺陷，并研究了它们对材料功能的影响。为这项研究选择的材料系统是纳米层和纳米颗粒掺杂的YBCO。目的是了解外延纳米复合陶瓷薄膜中的界面控制，目的是为界面设计独特的功能。首先，将对已经观察到强大的界面效应的纳米层系统进行彻底的微结构表征。各种原子级表征工具的组合将使用高分辨率透射电子显微镜（TEM），扫描透射电子显微镜（STEM）和电子能量损耗光谱（EEL）分析（EELS）分析，以识别界面上的MIDDFIT脱位和相关的缺陷。其次，将在YBCO纳米复合薄膜上进行一项系统的研究，以将不合适的位错密度和通量插入性质相关联。最后，提出了一个新颖的2D有序的纳米颗粒阵列，该阵列被限制在2D MIDDFIT位错阵列中。所有YBCO纳米复合薄膜将通过TAMU的脉冲激光沉积（PLD）制备。各种表征技术，例如高分辨率XRD，TEM（与茎和鳗鱼复合分析结合）以及运输属性测量结果将用于研究这些YBCO纳米复合材料系统的结构和通量限制性能。