Metal-Ceramic Electromagnetostrictive Nanocomposites for Magnetoelectric Nonreciprocal Impedance Inverter

用于磁电不可逆阻抗逆变器的金属陶瓷电磁致伸缩纳米复合材料

• 批准号: 0757502
• 负责人: Shashank Priya
• 金额: $ 39万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-01 至 2012-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0757502&HistoricalAwards=false
• 关键词: Metal; Ceramic; Electromagnetostrictive; Nanocomposites; Magnetoelectric

TECHNICAL: In this transformative project, PIs plan to synthesize multi-functional materials (MFM) that (i) posses electro-magnetostriction, (ii) exhibits magnetoelectricity, (iii) works as a non reciprocal impedance inverter, and (iv) displays high mechanical strength. The project will synthesize and investigate the structure-property relationship of these novel electrically controlled magneto-electric (ME) nano-composites. The electrically controlled ME system will be realized by using metal nanoparticles which are magnetostrictive and conductive forming a core-shell structure with the ferromagnetic ferrite. The metal ferromagnetic core-shell particles are embedded in a piezoelectric matrix and sintered together yielding a metal-ceramic nano-composite. In this nano-composite, the applied electric field results in a closed loop current in the metal shell inducing magnetic field in the ferrite core which generates strain through magnetostriction. This strain is converted into electric charge through the piezoelectric phase. The synthesis of the electrically controlled ME nano-composite will lead to the invention of a new passive electrical network component - gyrator - which at present does not exist. In conjunction with TEM, nano-beam electron diffraction and X-ray energy-dispersive spectroscopy with a probe size down to a few nanometers will be used to investigate the role of the metallic layer in the formation of the magnetic and piezoelectric domain structures. An important question that will be answered in this project is related to the understanding of metallic layer thickness effect in the nanometer range on the macroscopic ME properties. Comparative studies of the local ME exchange with corresponding structural investigations by XRD and HREM, will be performed to reveal how inter-phase interfaces and their orientations affect ME exchange. NON-TECHNICAL: The material and device synthesized in this research and education program will have significant impact on the electronics industry by improving performance of various components including passive and active filters or delay lines, magnetic field sensors, current probes, read-only memory device, transducers, electromagnetic pick-ups, and advance the application of metallic nanoparticles. The interdisciplinary research area of ME materials will attract students from several majors including materials science and engineering, electrical engineering, mechanical engineering, and electronics. The PIs' will hire one undergraduate student every summer to work on nano-material synthesis. This exercise will also expose them to the state-of-the-art research facilities. The undergraduate student will be drawn from the college of engineering and funded through the summer scholarships given by The Provost of the university. Minority undergraduate students will be involved in the research through the Society of Hispanic Professional Engineers (SHPE). The PI's will initiate a laboratory component to the course Ferroelectric Devices offered in the Fall Semester at UTA "MSE 5390" addressing the application of magneto-electric material. A focused effort on involvement of young women students in the engineering fields will be conducted through lectures in the high school (UTA - Fort Worth Academic Connection). Broad dissemination of the results will be achieved through journal publications, and conference proceedings. The PI's will organize the symposium "Ferroelectric and MultiFerroic Materials", at annual American Ceramic Society meeting. The application oriented results of the research will be provided to the industrial community through the UTA Piezoelectric Workshop Series which is held every year in last week of January. In this way, this research and education program will provide an integrated contribution to the science and society.

技术支持：在这个变革性的项目中，PI计划合成多功能材料（MFM），（i）抑制电磁致伸缩，（ii）表现出磁电性，（iii）作为非互易阻抗逆变器工作，（iv）显示高机械强度。本计画将合成并研究这些新型电控磁电奈米复合材料的结构与性质关系。电控ME系统将通过使用金属纳米颗粒来实现，所述金属纳米颗粒具有磁致伸缩性和导电性，与铁磁铁氧体形成核壳结构。将金属铁磁核-壳颗粒嵌入压电基质中并烧结在一起，产生金属-陶瓷纳米复合材料。在这种纳米复合材料中，所施加的电场导致金属壳中的闭环电流在铁氧体芯中感应磁场，其通过磁致伸缩产生应变。这种应变通过压电相转化为电荷。电控ME纳米复合材料的合成将导致发明一种新的无源电网络组件-回转器-目前还不存在。结合TEM，纳米束电子衍射和X射线能量色散光谱与探针尺寸下降到几个纳米将被用来调查的磁性和压电域结构的形成中的金属层的作用。一个重要的问题，将在这个项目中回答的是有关的理解，在纳米范围内的宏观ME性能的金属层厚度的影响。通过XRD和HREM对局部ME交换与相应的结构调查进行比较研究，以揭示相间界面及其取向如何影响ME交换。非技术性：在这项研究和教育计划中合成的材料和器件将对电子工业产生重大影响，通过提高各种组件的性能，包括无源和有源滤波器或延迟线，磁场传感器，电流探头，只读存储器设备，换能器，电磁拾取器，并推进金属纳米粒子的应用。ME材料的跨学科研究领域将吸引来自材料科学与工程，电气工程，机械工程和电子等多个专业的学生。PI每年夏天都会雇佣一名本科生从事纳米材料合成的工作。这项工作还将使他们接触到最先进的研究设施。本科生将从工程学院抽取，并通过大学教务长提供的夏季奖学金资助。少数民族本科生将通过西班牙裔专业工程师协会（SHPE）参与研究。PI将在UTA“MSE 5390”秋季学期提供的铁电器件课程中启动一个实验室组件，以解决磁电材料的应用。将通过在高中（UTA -沃斯堡学术联系）举办讲座，集中努力让年轻女学生参与工程领域。将通过期刊出版物和会议记录广泛传播研究结果。PI将在美国陶瓷协会年会上组织“铁电和多铁材料”研讨会。面向应用的研究成果将通过每年1月最后一周举行的UTA压电研讨会系列提供给工业界。通过这种方式，这项研究和教育计划将为科学和社会做出综合贡献。