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.

包含不同化学元素的非技术材料每天都有各种有用的特性，并且在像LED灯泡一样基本的设备中发现。这些特性（包括光学和磁性行为）尤其是在含有氟的材料中发现的，用于许多需要发射光才能发挥作用的应用。例如，LED灯泡中的涂料，用于国土安全性的辐射探测器以及用于医疗X射线的扫描仪。对于许多光学应用，有必要以单晶的形式获得材料。因此，这项研究得到了NSF材料研究部的固态和材料化学计划的支持，因此，通过开发新方法来生长这种晶体并优化化学成分以获得具有所需特性的材料，从而针对新的氟化物材料的晶体生长。基础研究重点是旨在展示特定特性的新型含氟材料的晶体生长，例如光发射，可以找到宽度的应用并可以使国家受益。作为这项研究的一部分，许多学生接受了化学科学的培训，包括众多学生，包括来自代表性不足的人群的学生，在材料化学研究实验室经验中进行了培训。此外，这是一项针对研究不足的少数群体所代表的夏季计划，并向他们讲授了材料的化学反应，目的是将其专门招募到南卡罗来纳大学的化学研究生课程中。技术总结通过晶体生长发现的材料发现概念可用于大大增加新的氟化物和氧氟化物材料家族的数量，以开发新的功能材料。众所周知，复杂的氟化物材料对于依靠其光学特性（例如发光和闪烁）的应用很重要，而获得氟化物和氧气氟化物结构的能力进行了磁性乐载量的一般兴趣，这对理解自旋液体和旋转冰行为具有一般兴趣。该研究项目集中在新方法的开发中，以系统合成并表征新的氟化物和氧气含氧材料，并研究其光学和磁性行为。具体而言，通过三种不同的合成途径（轻度热液，超临界水热和通量晶体生长）进行新的磁性和光学材料，对新氟化物和氧氟化物材料的晶体生长进行优化。特性通过转变和植物元素的选择和公司来控制新的氟化物和氧氟化物结构，其中使用含有过渡和灯笼金属的氟化物结构来研究磁性行为，并且含有灯笼的人用于研究光学特性。作为这项研究的一部分，在化学化学研究实验室的经验中，涉及各种各样的学生，包括来自代表性群体不足的学生，包括来自代表性不足的群体的学生，对化学科学进行了培训。此外，这是一项针对研究不足的少数群体的夏季计划，并向他们讲授了材料的化学，目的是将其专门招募到南卡罗来纳大学化学研究生课程中。该奖项反映了NSF的法定任务，并通过使用该基金会的知识分子和广泛的影响来评估Criteria诚实地认为，通过评估诚实的支持。