CAREER: Understanding and Controlling the Integration of Magnetism into Semiconducting Mixed Metal Chalcogenides

职业：理解和控制磁性融入半导体混合金属硫属化物

• 批准号: 1237550
• 负责人: Pierre Poudeu Poudeu
• 金额: $ 35.05万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-01-01 至 2015-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1237550&HistoricalAwards=false
• 关键词: CAREER; Understanding; Controlling; Integration; Magnetism

TECHNICAL SUMMARY:The ability to develop in a single material, ferromagnetic and semiconducting functionalities which are desirable for spintronics as well as thermoelectric devices is a great challenge in solid state chemistry. This CAREER grant supported by the Solid State and Materials Chemistry (SSMC) program seeks to exploit the marked structural features of synthetic and naturally occurring ternary and quaternary heavy main-group metal chalcogenides with general composition Pb(n+2)Sb2(m+1)Q(n+3m+5 and MtPb(n-t+2)Sb2(m+1)Q(n+3m+5) (M = Mn, Fe, Co; Q = S, Se, Te) to: (i) investigate the stability of the framework structure upon changing the nature of transition metal elements and/or the nature of chalcogen atom; (ii) investigate how the magnetism and the charge transport properties of this family of compounds change with modification of the composition and structure; and (iii) understand the correlation between the charge carrier's concentration and mobility and the coupling between magnetic centers in the structure. This will be done by combining two approaches: (a) the nature and stoichiometry of elements within a given structure type will be systematically varied and their effects on the magnetism and electronic transport of the resulting materials will be assessed, (b) for a given system, phases with structures closely related to each other (pseudo-homologous series) will be used to investigate the effects of structural evolution (changes in structure type within the homologous series) on the magnetism and charge transport properties of the materials. NON-TECHNICAL SUMMARY:This research program aims to develop ferromagnetic and semiconducting functionalities in a single material. The availability of such materials could impact the architecture of modern computers where an entire computer is built on a single semiconducting chip using a device capable of electronically writing and reading information to and from a magnetic material. Additionally, the materials can also be used to build a device capable of cooling the whole computing system. The multi-component educational program proposed in this CAREER grant will provide research and teaching experiences to K-12 teachers, high school students, undergraduate students, graduate students and postdoctoral associates. Graduate students and postdoctoral researchers will receive outstanding training on state-of-the-art techniques in high temperature solid-state synthesis, X-ray diffraction and physical properties measurements. They will also be involved in data analysis as well as preparation of manuscripts for publication. Although, the University of New Orleans (UNO) is located in an "urban city" with about 58% of the population from African American origin, the number of high school seniors from this group entering higher education is still low. The proposed Community Services and Learning Experiences for Chemistry Freshmen program will provide hands-on experience and training to current UNO Chemistry freshmen while simultaneously stimulating interest among high school students (sophomores, juniors and seniors) in chemistry.

技术摘要：在单一材料，铁磁和半导体功能中开发的能力，对于自旋形成型以及热电设备是可取的，这在固态化学中是一个巨大的挑战。固态和材料化学（SSMC）计划支持的这项职业赠款旨在利用合成和自然发生的三元和第四纪重型主基团金属硫化硫化的明显结构特征，并具有一般组成Pb（n+2）SB2（N+2）SB2（M+1）Q（N+3m+5和MTPB（N+3m+5和MTPB（N-TPB）（N-t+2）SB2（N+3M+3M+） Mn，Fe，c = s，se，te）至：（i）在改变过渡金属元素的性质和/或chalcogen原子的性质时，框架结构的稳定性； structure. This will be done by combining two approaches: (a) the nature and stoichiometry of elements within a given structure type will be systematically varied and their effects on the magnetism and electronic transport of the resulting materials will be assessed, (b) for a given system, phases with structures closely related to each other (pseudo-homologous series) will be used to investigate the effects of structural evolution (changes in structure type within the homologous series) on the材料的磁和电荷传输特性。 非技术摘要：该研究计划旨在开发单个材料中的铁磁和半导体功能。此类材料的可用性可能会影响现代计算机的架构，在该计算机上，整个计算机都使用能够通过电子编写和从磁性材料进行电子编写和阅读信息的设备构建在单个半导体芯片上。此外，这些材料也可以用于构建能够冷却整个计算系统的设备。本职业赠款中提出的多组分教育计划将为K-12教师，高中生，本科生，研究生和博士后同事提供研究和教学经验。研究生和博士后研究人员将接受有关高温固态合成，X射线衍射和物理特性测量的最先进技术的出色培训。他们还将参与数据分析以及准备出版的手稿。尽管新奥尔良大学（UNO）位于一个“城市”中，约有58％的非裔美国人人口，但进入高等教育的高中生数量仍然很低。 拟议的社区服务和化学新生计划的学习经验将为当前的UNO化学新生提供动手经验和培训，同时激发了化学中高中生（大二学生，大三和老年人）的兴趣。