New Fluoride and Oxyfluoride Materials – Targeting Magnetic and Optical Properties

新型氟化物和氟氧化物材料 – 针对磁和光学特性

• 批准号: 2221403
• 负责人: Hans-Conrad zur Loye
• 金额: $ 71万
• 依托单位: University of South Carolina at Columbia
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-08-01 至 2026-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2221403&HistoricalAwards=false
• 关键词: New; Fluoride; Oxyfluoride; Materials; Targeting

Non-TechnicalMaterials containing different chemical elements exhibit a wide range of useful, everyday properties and are found in devices as basic as LED light bulbs. The properties, which include optical and magnetic behavior, are found especially in materials containing fluorine and are used for many applications that require the emission of light for them to function. Examples include coatings in LED light bulbs, radiation detectors for homeland security, and scanners for medical x-rays. For many optical applications it is necessary to obtain the materials in the form of single crystals. The research, supported by the Solid State and Materials Chemistry program in NSF’s Division of Materials Research, therefore, targets the crystal growth of new fluoride materials by developing new methods to grow such crystals and by optimizing the chemical compositions to obtain materials with the desired properties. The basic research focus is on the crystal growth of new fluorine-containing materials that are designed to exhibit specific properties, such as light emission, which can find widespread applications and can benefit the nation. As part of this research, numerous students are trained in the chemical sciences by involving a wide range of students, including those from underrepresented groups, in a materials chemistry research laboratory experience. Furthermore, a summer program for undergraduates allows the involvement of underrepresented minorities in research and teaches them about the chemistry of materials with the goal of recruiting them specifically into the University of South Carolina chemistry graduate program. Technical SummaryThe concept of materials discovery via crystal growth is applied to substantially increase the number of new fluoride and oxyfluoride material families to develop new functional materials. It is well known that complex fluoride materials are important for applications that rely on their optical properties, such as luminescence and scintillation, while the ability to obtain fluoride and oxyfluoride structures exhibiting magnetic frustration is of general interest for understanding spin-liquid and spin-ice behavior. The research project is centered around the development of new approaches to systematically synthesize and characterize new classes of fluoride and oxyfluoride materials and to study their optical and magnetic behavior. Specifically, the optimization of the crystal growth of new fluoride and oxyfluoride materials is carried out via three different synthetic routes (mild hydrothermal, supercritical hydrothermal, and flux crystal growth) to produce new magnetic and optical materials. Properties are controlled via the selection and incorporation of transition and lanthanide elements into the new fluoride and oxyfluoride structures, where those containing transition and lanthanide metals are used to study magnetic behavior and those containing lanthanides are used to study optical properties. As part of this research, numerous students are trained in the chemical sciences by involving a wide range of students, including those from underrepresented groups, in a materials chemistry research laboratory experience. Furthermore, a summer program for undergraduates allows the involvement of underrepresented minorities in research and teaches them about the chemistry of materials with the goal of recruiting them specifically into the University of South Carolina chemistry graduate program.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

含有不同化学元素的非技术材料表现出广泛的有用的日常特性，并且存在于像 LED 灯泡这样的基本设备中。这些特性（包括光学和磁性行为）尤其存在于含氟材料中，并用于许多领域。需要发射光才能发挥作用的应用，例如 LED 灯泡的涂层、国土安全辐射探测器和医用 X 射线扫描仪。对于许多光学应用，需要以单一形式获得材料。因此，这项研究得到了美国国家科学基金会材料研究部固态和材料化学项目的支持，其目标是通过开发生长此类晶体的新方法并优化化学成分以获得具有氟化物材料的材料。基础研究的重点是新型含氟材料的晶体生长，这些材料旨在表现出特定的性能，例如发光，它可以得到广泛的应用，并且可以造福国家。通过让广泛的学生（包括来自代表性不足的群体的学生）参与材料化学研究实验室的经历，接受化学科学方面的培训。此外，本科生暑期课程允许代表性不足的少数群体参与研究，并向他们传授化学知识。技术摘要通过晶体生长发现材料的概念被应用于大幅增加新氟化物和氟氧化物材料家族的数量，以开发新的功能材料。知道复杂的氟化物材料对于依赖其光学特性的应用非常重要，例如发光和闪烁，而获得表现出磁挫败的氟化物和氟氧化物结构的能力对于理解自旋液体和自旋冰行为具有普遍意义。重点是开发系统合成和表征新型氟化物和氟氧化物材料的新方法，并研究其光学和磁行为，具体而言，对新型氟化物和氟氧化物材料的晶体生长进行优化。通过三种不同的合成途径（温和水热、超临界水热和通量晶体生长）来生产新的磁性和光学材料，其性能通过选择过渡元素和镧系元素并将其纳入新的氟化物和氟氧化物结构来控制，其中含有的元素。过渡金属和稀土金属用于研究磁性行为，而含有稀土金属的金属用于研究光学性质。作为这项研究的一部分，许多学生通过广泛的学生（包括那些学生）接受化学科学方面的培训。此外，针对本科生的暑期课程允许代表性不足的少数群体参与研究，并向他们传授材料化学知识，目的是专门招募他们进入南卡罗来纳大学化学研究生。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。