Nanostructured and magnetic materials

这个研究项目涉及新的先进材料的开发。 它通过对材料的物理性质的透彻理解和使用有效的组合材料科学方法对材料进行仔细系统的调查来解决这个问题。 将研究三种基本类型的材料：（1）磁性形状记忆合金，（2）磁致伸缩材料和（3）锂离子电池电极材料。 磁性形状记忆合金和磁致伸缩材料都表现出很大的磁弹性效应，当施加磁场时，它们的外部尺寸会发生变化。 相反，施加机械应变可以导致产生磁场。 这些特性使材料可用于声纳投影仪、导弹制导执行器或磁场传感器等应用。 本论文主要研究Ni-Mn-Ga基磁性形状记忆合金和Fe-Ga基磁致伸缩合金。 将开发材料组成和制备方法以优化材料的有用性。 我们还将关注新型锂离子电池电极材料的开发。 通过对材料性能的仔细研究，我们预计材料的开发将提高可充电锂电池的容量和循环寿命。

This research program deals with the development of new advanced materials.  It approaches this problem through a thorough understanding of the physical properties of the materials and a careful systematic investigation of materials using efficient combinatorial materials science methods.  Three basic classes of materials will be studied: (1) magnetic shape memory alloys, (2) magnetostrictive materials and (3) Li-ion battery electrode materials.  Magnetic shape memory alloys and magnetostrictive materials both exhibit large magnetoelastic effects and change their external dimensions when a magnetic field is applied.  Conversely, the application of a mechanical strain can result in the production of a magnetic field.  These properties allow the materials to be used for applications such as sonar projectors, missile guidance actuators or magnetic field sensors.  Our work will deal with Ni-Mn-Ga based magnetic shape memory alloys and Fe-Ga based magnetostrictive alloys.  Material compositions and preparation methods will be developed to optimize the usefulness of the materials.  We will also look at the development of new Li-ion battery electrode materials.  Through a careful study of material properties we anticipate the development of materials that will improve both the capacity and cycle life of rechargeable Li batteries.