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：在陶瓷中添加少量金属原子或掺杂剂，通常会导致显着的特性变化，这些变化可能会影响燃料电池，气体分离和光催化等应用的性能。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。该响应意味着每种材料都表现出独特的磁性特征，因此可以使用磁性来理解掺杂剂在陶瓷中的作用。 PI是基准测试和建模磁性标志，其最终目标是设计具有非凡特性的新材料。与磁力计的领先制造商量子设计的合作意味着计量学的创新可以与材料发现紧密相结合。此外，量子设计还可以通过实习来吸引学生。作为该项目的一部分，科罗拉多州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，该会议由行业，大学教职员工和当地社区成员参加。这项研究在许多与能源相关的应用中产生了广泛的影响，在这些应用中，在理解和控制纳米级现象中存在挑战。技术细节：这个联合大学 - 行业研究项目是针对纳米级掺杂氧化物的磁力测量测量技术，并且正在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反应与纳米级结构和组成特征（例如大小和第二阶段的分布，固体溶液的布置），包括离子聚集和隔离以及掺杂剂价状态相关联。从磁力计的敏感性到区分各种纳米级结构，得出了一个特别新颖的方面，即可能在内部还原过程中研究陶瓷宿主中金属掺杂剂的成核和金属掺杂剂的初始阶段。在两个技术上重要的过渡金属氧化氧化物系统中，正在研究掺杂剂的行为：Yttria稳定的锆（YSZ）和氧化氢钡硫酸氢盐碳酸盐含钙钛矿（Bzy-Bcy）。一套表征工具，包括一种新型的原位拉曼光谱法测定法，可以实现基于动力学和热力学的内部还原和氧化的描述。该研究奠定了推进纳米级计量学的基础。研究生正在参与和培训正在开发的潜在变革性磁力测定表征工具中。