Solid-State Oxides and Oxide-Fluorides

固态氧化物和氧化物-氟化物

基本信息

批准号：
1904701
负责人：
Kenneth Poeppelmeier
金额：
$ 50.82万
依托单位：
Northwestern University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-07-01 至 2024-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1904701&HistoricalAwards=false
关键词：
Solid State Oxides Oxide Fluorides

项目摘要

Non-Technical SummaryLasers were discovered in 1960 by scientists at Bell Laboratories. A year after the initial discovery, a group of researchers demonstrated that the high electric fields produced by a laser pulse converted the light passing through a quartz crystal from one color to another (red to green) via a nonlinear optical (NLO) process called second-harmonic generation. Since then, NLO materials like quartz have played a key role in advancing frontiers in laser science. NLO activity and other exciting properties are allowed in materials where inversion symmetry in broken, which are known as noncentrosymmetric (NCS) solids. Through this project, which is supported by the Solid State and Materials Chemistry program at NSF, Prof. Poeppelmeier's group at Northwestern University advances the understanding how chemistry can be used to create materials with broken inversion symmetry and connect atomic structure to properties. A variety of synthetic approaches are used to control the alignment of the building blocks that make up a crystal structure. Their growth of large, high-quality crystals of NCS materials enables detailed investigation of the connection between atomic structure and properties in NCS materials. The research is carried out by undergraduate and graduate students, who in the process of this project are trained in state-of-the-art solid state chemistry. Additionally, the students are encouraged to participate in a myriad of outreach activities that the PI himself is involved in.Technical SummaryAdvances in laser technology have led to a significant increase in the application of laser systems in areas ranging from eye surgery to particle acceleration. Emerging laser technologies require high-performance materials that can efficiently convert the frequency of laser radiation through nonlinear optical (NLO) processes, such as second-harmonic generation and parametric amplification. The NLO properties necessary for applications in tunable laser systems, as well as other technologically useful properties such as piezoelectricity, ferroelectricity, and pyroelectricity, are available in crystalline materials lacking inversion symmetry, known as noncentrosymmetric (NCS) solids. This project, which is supported by the Solid State and Materials Chemistry program at NSF, develops targeted synthesis methods for NCS materials using hydrothermal, solvothermal, and solid-state methods to control the alignment of anionic basic building units such that useful properties can be realized. These synthetic efforts are guided by chemical knowledge as well as machine learning methods that elucidate important trends from large amounts of experimental data. The growth of large, high-quality crystals enables structural characterization with single crystal and powder x-ray diffraction along with NLO and other property measurements to determine structure-property relationships. Examination of the syntheses, structures, and properties of NCS materials is expected to lead to discovery of new NCS materials and new strategies for future NCS materials synthesis.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.

贝尔实验室的科学家在1960年发现了非技术总结。最初发现后一年，一群研究人员表明，激光脉冲产生的高电场通过非线性光学（NLO）工艺将通过石英晶体从一种颜色转化为另一种颜色（红色至绿色）的光。 - 谐波一代。从那时起，像石英这样的NLO材料在推进激光科学领域的前沿中发挥了关键作用。 NLO活性和其他令人兴奋的特性允许在破碎中的反转对称性的材料中，这被称为非中心对称（NCS）固体。通过这个项目，NSF的固态和材料化学计划支持，西北大学Poeppelmeier教授的小组促进了了解如何使用化学物质来创建具有破碎的反转对称性并将原子结构连接到属性的材料。使用多种合成方法来控制组成晶体结构的构建块的对齐。它们对NCS材料的大型高质量晶体的生长可以详细研究原子结构与NCS材料中特性之间的联系。这项研究是由本科生和研究生进行的，在该项目的过程中，他们接受了最先进的固态化学培训。此外，鼓励学生参加PI本人参与的无数外展活动。激光技术的技术摘要导致激光系统在从眼科手术到颗粒加速的领域中的应用大幅增加。新兴激光技术需要高性能材料，这些材料可以通过非线性光学（NLO）过程有效地转换激光辐射的频率，例如第二谐波生成和参数放大。在缺乏反转对称性的晶体中，可为可调激光系统应用所必需的NLO特性以及其他技术有用的特性，例如压电性，铁电性和高电性能。该项目由NSF的固态和材料化学计划支持，使用水热，溶剂热和固态方法开发针对NCS材料的靶向合成方法，以控制阴离子基本建筑单元的对齐，以便可以实现有用的特性。这些合成的工作是由化学知识和机器学习方法指导的，这些方法从大量实验数据中阐明了重要趋势。大型高质量晶体的生长可以通过单晶和粉末X射线衍射以及NLO和其他性质测量结果来确定结构 - 特性关系。检查NCS材料的合成，结构和特性的检查预计将导致发现新的NCS材料和未来NCS材料合成的新策略。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子的评估来支持的优点和更广泛的影响审查标准。

项目成果

期刊论文数量（15）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Synthesis, crystal structure, and magnetic properties of a one-dimensional chain antiferromagnet NiC2O4·2NH3

一维链状反铁磁体NiC2O4·2NH3的合成、晶体结构及磁性能

DOI：
10.1016/j.jssc.2022.123360
发表时间：
2022
期刊：
Journal of Solid State Chemistry
影响因子：
3.3
作者：
Ding, Fenghua;Griffith, Kent J.;Zhang, Chi;Zhan, Jing;Lu, Hongcheng;Poeppelmeier, Kenneth R.
通讯作者：
Poeppelmeier, Kenneth R.

Machine-Learning-Assisted Synthesis of Polar Racemates