GOALI: Magnetic Measurements to Characterize Chemistry and Structure in Nanoscale Doped Oxides

GOALI：通过磁性测量来表征纳米级掺杂氧化物的化学和结构

• 批准号: 1563754
• 负责人: Ivar Reimanis
• 金额: $ 66.67万
• 依托单位: Colorado School of Mines
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1563754&HistoricalAwards=false
• 关键词: GOALI; Magnetic; Measurements; Characterize; Chemistry

NON-TECHNICAL DESCRIPTION: The addition of small amounts of metal atoms, or dopants, to ceramics frequently leads to remarkable property changes that can impact performance in applications such as fuel cells, gas separation, and photocatalysis. The reasons for these changes are believed to be related to the type and state of the dopant and its spatial distribution, all of which influence the material's response to a magnetic field. That response means every material exhibits a unique magnetic signature, and thus, magnetism may be used to understand the roles of dopants in ceramics. The PIs are benchmarking and modeling the magnetic signatures, with the ultimate goal to design new materials with exceptional properties. The collaboration with Quantum Design, a leading manufacturer of magnetometers, means innovations in metrology can be closely coupled with materials discoveries. Additionally, Quantum Design engages students through internships. As part of the project, students of the Colorado Center for Advanced Ceramics are organizing and running an annual on-campus conference in ceramics with participation from industry, university faculty, and members of the local community. The research has broad impact in many energy-related applications where challenges exist in understanding and controlling nanoscale phenomena. TECHNICAL DETAILS: This combined university-industry research project is pioneering magnetometry measurement techniques for nanoscale doped oxides and is utilizing these techniques to assess material behavior. The main scientific objective is to correlate the magnetic response of ceramic materials with nanoscale structural and compositional features such as size and distribution of second phases, solid solution arrangement including ion clustering and segregation, and dopant valence state. From the sensitivity of magnetometry to differentiate the various nanoscale structures, a particularly novel aspect is derived, namely that it is possible to study the initial stages of nucleation and growth of the metal dopant within the ceramic host during internal reduction. The behavior of dopants is being examined in two technologically important transition metal-doped oxide systems: yttria-stablized zirconia (YSZ) and yttria-doped barium zirconate-barium cerate perovskites (BZY-BCY). A suite of characterization tools, including a novel in situ Raman spectroscopy-magnetometry technique, enables kinetic and thermodynamic based descriptions of internal reduction and oxidation. The research lays the foundation to advance the state of nanoscale metrology for magnetometry. Graduate students are being engaged and trained in the potentially transformative magnetometry characterization tools under development.

非技术描述：向陶瓷中添加少量金属原子或掺杂剂通常会导致显着的性能变化，这些变化可能会影响燃料电池，气体分离和催化剂等应用的性能。这些变化的原因被认为与掺杂剂的类型和状态及其空间分布有关，所有这些都会影响材料对磁场的响应。这种响应意味着每种材料都表现出独特的磁性特征，因此，磁性可以用来理解陶瓷中掺杂剂的作用。PI正在对磁性特征进行基准测试和建模，最终目标是设计具有特殊性能的新材料。与领先的磁力计制造商Quantum Design的合作意味着计量创新可以与材料发现紧密结合。此外，量子设计通过实习吸引学生。作为该项目的一部分，科罗拉多高级陶瓷中心的学生正在组织和举办一年一度的校园陶瓷会议，与会者包括工业界、大学教师和当地社区成员。这项研究在许多与能源相关的应用中产生了广泛的影响，这些应用在理解和控制纳米级现象方面存在挑战。技术规格：这个大学与工业相结合的研究项目开创了纳米掺杂氧化物的磁力测量技术，并利用这些技术来评估材料行为。主要的科学目标是将陶瓷材料的磁响应与纳米级结构和成分特征（例如第二相的尺寸和分布、包括离子聚集和偏析的固溶体排列以及掺杂剂价态）相关联。从灵敏度的磁力来区分各种纳米级结构，一个特别新颖的方面是派生的，即它是可能的，以研究在内部还原过程中的陶瓷主机内的金属掺杂剂的成核和生长的初始阶段。在两种技术上重要的过渡金属掺杂氧化物系统中，掺杂剂的行为正在被检查：氧化钇稳定的氧化锆（YSZ）和氧化钇掺杂的锆酸钡-铈酸钡钙钛矿（BZY-BCY）。一套表征工具，包括一种新的原位拉曼光谱-磁力技术，使动力学和热力学为基础的描述内部还原和氧化。该研究为提高磁测量的纳米计量水平奠定了基础。研究生正在参与和培训的潜在变革磁力表征工具正在开发中。