Crystal Growth of Intermetallics with Competing Magnetic Interactions

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的大单晶的生长。为了明确地确定材料的固有属性，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使人们能够确定固有性质，并确定结构与不寻常的磁性和电性之间的基本关联。本研究在固态和材料化学计划的支持下，致力于合成三元金属间化合物Ln：M：X(Ln=La，M=过渡金属，X=Al，In)，以将晶体化学和物理性能联系起来。针对CeCr2Al20、Ho6Mo4Al43、ThMn12和YbFe2Al10结构类型，重点研究了四类金属间化合物的高质量单晶生长，以研究磁起伏和反常磁性之间的竞争关系。这些结构由高度配位的多面体组成，可以作为研究两个亚晶格和堆积对磁性作用的模型。非技术概述：寻找具有所需性能的材料同时依赖于新材料和新系统的发现。这项拟议的工作由固态和材料化学计划支持，涉及合成和表征含有稀土过渡金属的新材料，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量应用的新化合物的本征行为。PI的小组将继续与日本的科学家合作，因为研究小组之间存在着合成和表征的自然和互惠的协同，以及研究小组之间对研究生和本科生的共同指导。通过在两门课程(普通化学和高级无机化学)中整合结晶学和材料科学，将研究和教学结合在一起。与当地一所小学的伙伴关系将导致在课程开发方面继续加强。陈小组将继续开发与实践材料相关的演示，以纳入路易斯安那州立大学化学演示计划。这项提议的另一个目的是让高中化学和物理教师在实验室进行暑期研究体验。这将提供一个宝贵的工具，以促进教师对科学的参与，以及他们对他们的纪律如何与课堂上的孩子相关的理解。

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.