Crystal Growth of Intermetallics with Competing Magnetic Interactions

具有竞争性磁相互作用的金属间化合物的晶体生长

• 批准号: 1358975
• 负责人: Julia Chan
• 金额: $ 24.79万
• 依托单位: University of Texas at Dallas
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-08-16 至 2016-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1358975&HistoricalAwards=false
• 关键词: Crystal; Growth; Intermetallics; Competing; Magnetic

TECHNICAL SUMMARY:The search for materials with desired properties concomitantly relies on the discovery of new materials and the subsequent growth of large single crystals. To unequivocally determine the material's innate properties, large single crystals must be grown such that detailed studies can be completed. The growth of high quality single crystalline materials allows the determination of intrinsic properties and for fundamental correlation between structures and unusual magnetic and electrical properties. This research, supported by the Solid State and Materials Chemistry program is focused on synthesizing materials of the ternary intermetallics Ln:M:X (Ln = lanthanide, M = transition metal, X = Al, In) to correlate crystal chemistry and physical properties. The effort is focused on growing high quality single crystals of four families of intermetallics to study the competition of magnetic fluctuations and unusual magnetism, targeting the CeCr2Al20, Ho6Mo4Al43, ThMn12, and YbFe2Al10 structure types. These structures consist of high coordination polyhedra and serve as models for investigating the role of two sublattices and packing on magnetism. NON-TECHNICAL SUMMARY:The search for materials with desired properties concomitantly relies on the discovery of new materials and systems. The proposed work, supported by the Solid State and Materials Chemistry program involves the synthesis and characterization of novel materials containing rare earth transition metals to understand new physical phenomena. The group's effort is aimed at growing large single crystals to perform measurements and determine intrinsic behavior of new compounds with potential energy applications. The PI's group will continue collaborations with scientists in Japan as there is a natural and mutually beneficial synergy of synthesis and characterization that exists between research groups, as well as a common mentoring of graduate and undergraduate students between the research groups. Research and teaching are integrated by incorporating crystallography and materials science throughout two courses (General Chemistry and Advanced Inorganic Chemistry). The partnership with a local elementary school will lead to continued enhancement in curriculum development. The Chan group will continue to develop hands-on materials-related demonstrations for incorporation into LSU Chem Demo program. An additional aim of this proposal is to involve high school chemistry and physics teachers for a summer research experience in the laboratory. This will offer an invaluable tool to boost teachers' involvement in the sciences and their understanding of how their discipline relates to the children in the classroom.

技术概述：寻找具有所需性能的材料同时依赖于新材料的发现和随后大单晶的生长。 为了明确地确定材料的固有性质，必须生长大的单晶，以便完成详细的研究。 高质量单晶材料的生长允许确定固有特性以及结构与不寻常的磁和电特性之间的基本相关性。本研究由固态与材料化学计划支持，重点是合成三元金属间化合物Ln：M：X（Ln =镧系元素，M =过渡金属，X = Al，In）的材料，以关联晶体化学和物理性质。 这项工作的重点是生长四个家族的金属间化合物的高质量单晶，以研究磁波动和异常磁性的竞争，目标是CeCr2Al20，Ho6Mo4Al43，ThMn12和YbFe2Al10结构类型。 这些结构由高配位多面体组成，并作为研究两个子晶格和包装对磁性的作用的模型。非技术总结：寻找具有所需性能的材料同时依赖于新材料和系统的发现。 由固态和材料化学计划支持的拟议工作涉及含有稀土过渡金属的新型材料的合成和表征，以了解新的物理现象。该小组的努力旨在生长大型单晶，以进行测量并确定具有潜在能源应用的新化合物的内在行为。PI的团队将继续与日本的科学家合作，因为研究小组之间存在天然和互利的合成和表征协同作用，以及研究小组之间对研究生和本科生的共同指导。 研究和教学通过将晶体学和材料科学纳入两门课程（普通化学和高级无机化学）来整合。与当地一所小学的伙伴关系将继续加强课程编制。Chan小组将继续开发与实践材料相关的演示，以纳入LSU化学演示计划。 这项建议的另一个目的是让高中化学和物理教师在实验室进行夏季研究。 这将提供一个宝贵的工具，以促进教师参与科学和他们的学科如何在课堂上与儿童的理解。