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Nickel 1+/2+ Oxides and Oxyfluorides Isoelectronic with Superconducting Cuprates

镍 1 /2 氧化物和氟氧化物与超导铜酸盐等电子

基本信息

批准号：
2004740
负责人：
Viktor Poltavets
金额：
$ 47.57万
依托单位：
University of New Orleans
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-07-01 至 2023-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2004740&HistoricalAwards=false
关键词：
Nickel 1+2+Oxides Oxyfluorides

项目摘要

NON-TECHNICAL SUMMARY:Superconducting materials can transmit electric current without losses and create high magnetic fields, which has led to their application in magnetic resonance imaging, levitation trains, electric motors and generators. However, the mechanism of superconductivity in well-established copper-based materials that superconduct at relatively high temperature is still not fully understood. The recent discovery of superconductivity in thin films of doped NdNiO2 confirmed that these materials, based on nickel, can exhibit physics similar to the superconducting copper-based materials. In this project, supported by the Solid State and Materials Chemistry program within the Division of Materials Research, new Ni1+/Ni2+ nickel-based materials are synthesized and their structure-property relationships are investigated in detail. This impacts our understanding of the high-temperature superconductivity mechanism, potentially guiding the design of new superconductors and contributing to national energy security.Educational impacts of the project will be achieved by training graduate and undergraduate students in the areas of inorganic synthesis, electrochemistry, crystallography, and various characterization techniques. The PI leads the High School Science Teachers Club for teachers from the Greater New Orleans area. The Teachers Club is designed to involve teachers in sharing effective teaching strategies and to educate teachers on current research topics. With the goal of improving science education, the Educational Equipment Lending Library, also established by the PI, is being enhanced with new demonstrations to be used in outreach to high school students.TECHNICAL SUMMARY:Ni1+/Ni2+ nickelates with infinite NiO2 square-planar layers are the only real electronic (d9/d8), and structural (MO2 planes) analogues to high-temperature superconducting cuprates. However, only a few such nickelates are known and no systematic investigation of doped d9/d8 nickelates has been performed. In this project, supported by the Solid State and Materials Chemistry program within the Division of Materials Research, comprehensive investigations of syntheses, structures and properties of doped and undoped Ni1+/Ni2+ nickelates and oxyfluorides with NiO2 planes are producing new cuprate analogues and systematic structure-property relationships. Multiple families of compounds are being studied: doped infinite-layer nickelates with d8/d9 and d9/d10 ratios analogous to the superconducting cuprates, new n = 4 and 5 homologues of T-prime nickelate series as well as fluorinated T-prime nickelates. High-pressure, high-temperature synthesis is used for preparation of some doped parent Ruddlesden-Popper compounds. Low temperature, soft chemistry techniques are used for the preparation of the final (reduced) compounds. In addition to structure determination by powder X-ray and neutron diffraction experiments, physical properties are investigated by ambient and high pressure magnetic and transport measurements, solid-state NMR and muon spin rotation techniques. The project aims for discovery of nickelate superconductors and new fundamental insight into cuprate superconductivity and, more generally, into materials with strongly correlated electrons.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.

超导材料可以无损耗地传输电流并产生高磁场，这导致它们在磁共振成像，悬浮列车，电动机和发电机中的应用。然而，在相对高温下超导的成熟铜基材料中的超导性机制仍然没有完全理解。最近在掺杂NdNiO 2薄膜中发现的超导性证实了这些基于镍的材料可以表现出与超导铜基材料相似的物理性质。在该项目中，在材料研究部的固态和材料化学计划的支持下，合成了新的Ni 1 +/Ni 2+镍基材料，并详细研究了它们的结构-性能关系。这将影响我们对高温超导机制的理解，可能指导新超导体的设计，并为国家能源安全做出贡献。该项目的教育影响将通过培养无机合成，电化学，晶体学和各种表征技术领域的研究生和本科生来实现。PI领导来自大新奥尔良地区的高中科学教师俱乐部。教师俱乐部旨在让教师参与分享有效的教学策略，并就当前的研究课题对教师进行教育。为了提高科学教育的目标，教育设备借阅图书馆，也建立了PI，正在加强与新的示范，用于推广到高中学生。技术摘要：Ni 1 +/Ni 2+镍酸盐与无限的NiO 2正方形平面层是唯一的真实的电子（d9/d8），和结构（MO 2平面）类似物高温超导铜酸盐。然而，只有少数这样的镍酸盐是已知的，并且没有进行掺杂的d9/d8镍酸盐的系统研究。在该项目中，由材料研究部内的固态和材料化学计划支持，对掺杂和未掺杂的Ni 1 +/Ni 2+镍酸盐和具有NiO 2平面的氟氧化物的合成，结构和性质的全面研究正在产生新的铜酸盐类似物和系统的结构-性质关系。多个家庭的化合物正在研究：掺杂的无限层镍酸盐与d8/d9和d9/d10的比例类似于超导铜酸盐，新的n = 4和5同系物的T-总理镍酸盐系列以及氟化的T-总理镍酸盐。采用高压高温合成法制备了一些掺杂的Ruddlesden-Popper母体化合物。低温、软化学技术用于制备最终（还原）化合物。除了通过粉末X射线和中子衍射实验确定结构外，还通过环境和高压磁性和传输测量，固态NMR和μ子自旋旋转技术研究了物理性质。该项目旨在发现镍酸盐超导体和铜酸盐超导性的新的基本见解，更普遍地说，进入具有强关联电子的材料。该奖项反映了NSF的法定使命，并已被认为值得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的支持。