无稀土Mn基永磁材料相关体系合金相图及其化合物的结构与性能研究

This project will first time to study the phase relations and crystal structures and physical properties of the compounds in the Mn-Bi-X (X=Fe, Al, Sb, Co) ternary systems, which are related to rare earth free Mn-based permanent magneitc alloys,and figure out the possibility of these alloys being permanent magnetic materials. The project will explore and look for new new Mn-based ternary compounds related permanent magnets based on our experience and by investigations on alloy phase diagrams of these sysetms, especially the new Mn-based ternary compounds with excellent physical properties. The new Mn-based compounds will be synthesized. Investigations on the magnetic, electrical and thermal expansion properties of the new compounds will be performed. Studies on the effects of Sn, Cr and rare earth metals on the structures and physical properties of Mn-based ternary compounds, especially those with excellent physical properties, will be carried out. The project manifests itself a character of initial innovation. The research results will provide basic guide for exploring cheap new functional materials with excellent magnetic for permanent magnetic materials. The investigation on the R-Bi based ternary systems is very significant and valuable for developing and utilizing the abundant nonferrous metal resources of Bi and Mn minerals ores in Guangxi province and our country.

本项目首次研究无稀土永磁材料相关的Mn基合金相关体系--Mn-Bi-X (X=Fe, Al, Sb, Co)三元系的合金相关系及其新化合物的晶体结构与物理性能，并探索其作为无稀土永磁材料的可能性。通过研究合金相图以及我们的研究经验，探索、寻找、发现和研究永磁材料相关体系的无稀土Mn基新三元化合物、特别是具有良好磁性性能的新化合物，并对新化合物的晶体结构和磁性性能、电学性质、热膨胀性能进行研究。根据需要，研究掺杂元素Sn、Cr、稀土等合金元素对永磁相的MnBi及Mn基三元化合物、特别是对磁性较好的新化合物的晶体结构、磁性及电性质的影响。项目的研究属原创性探索，具有原始创新的特点，将为研究和探索价格低廉的、高性能的新型无稀土永磁磁性等材料提供理论依据，同时，对开发利用我国的Bi矿产资源和广西丰富的Mn矿产资源也有重要的经济价值和社会价值。

本项目利用X射线衍射仪（XRD）、电子显微镜（SEM）结合能谱分析（EDS）和磁性测量等实验手段和方法，研究和测定了Mn-Bi-X (X=Fe, Al, Co)及Co-Ni-In等4个三元系合金相图及其化合物的晶体结构和磁性性能，研究了Gd, Y, Al等掺杂合金元素对MnBi结构及其磁性能的影响；合成了Co80-xMnxSn20 等相关的新化合物，确定和合成这些化合物的存在，并测定和研究其晶体结构与磁性性能。项目的结果为研究和探索价格低廉的高性能的无稀土或少稀土磁性材料等新型材料提供依据。同时，对开发利用广西和我国丰富的锰、铝等有色矿产资源也有重要的意义。