RUI: Magnetic properties of epsilon-Fe2O3 and alpha-FeOOH: an investigation of phase conversions and cations doping.

存在于岩石、土壤和沉积物等地质物质中的氧化铁矿物变化很大，它们的结构、化学组成和磁性反映了这些矿物形成的环境条件。在这项研究中，教师和本科生研究人员合作研究实验室制备的氧化铁类似于地质材料的磁性。参与项目的本科生将参与数据收集和数据分析的实验工作。拟议的研究将使本科生参与原创性研究，在那里他们将接受如何解决问题的培训，从而进一步培养使用现代技术和技术的下一代科学家。本本科院校研究（RUI）项目的目标是研究影响氧化铁形成的物理和化学参数，如时间、温度和离子的可用性。研究人员将研究铁取代Al + Ni和Al + Cr在针铁矿晶格中的竞争过程，以及γ - β - ε - α Fe2O3多晶的转化过程。通过结合使用技术，Mössbauer光谱学在室温下，从50 K到1000 K的磁强计在外部应用领域高达3 T，他们将研究铁相的磁性，在研究土壤，沉积物和考古材料时产生有价值的信息。本科学生将在夏季和/或常规学年从事这项研究工作，训练他们使用现代仪器和技术来研究磁性材料。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

The iron oxide minerals present in geological materials such as rocks, soils, and sediment vary greatly, and their structure, chemical makeup, and magnetic properties reflect the environmental conditions in which these minerals were formed. In this research, faculty and undergraduate researchers work in collaboration to investigate the magnetic properties of laboratory-prepared iron oxides similar to geological materials. The undergraduate students involved in the projects will participate in experimental work of data collection and data analysis. The proposed study will engage undergraduate students in original research where they will be trained on how to solve problems, and thus further the mission of training the next generation of scientists using modern technology and techniques.The goal of this Research in Undergraduate Institution (RUI) project is to investigate the physical and chemical parameters such as time, temperature, and the availability of ions that influence iron oxide formation. The researchers will investigate the competitive process of iron substitutions, Al + Ni and Al + Cr, in the lattice of goethite and the conversion process of gamma-beta-epsilon-alpha Fe2O3 polymorphs. By using a combination of techniques, Mössbauer spectroscopy at room temperature, and magnetometry from 50 K to 1000 K in an externally applied field up to 3 T, they will investigate the magnetic properties of the iron phases, resulting in valuable information when studying soils, sediments, and archaeological materials. Undergraduate students will be engaged in this research work during the summer and/or regular school year, trained to use modern instruments and techniques to investigate magnetic materials.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.