Mn基四方结构Heusler合金相关体系相图及化合物的结构与性能的研究

Heusler合金是一类性能优异的金属间化合物,组成Heusler 合金的组元很多，几乎占据了半个周期表。不断发现Heusler 合金的新特性及潜在的应用前景，使得对Heusler 合金研究十分活跃。本项目主要研究Mn基Heusler合金四方相Mn3−xTxGa和Mn3−xTxGe相关体系Cr-Mn-Ga和Co-Mn-Ge三元系合金相图及相关化合物的晶体结构与物理性能，系统研究第三组元T对四方相的结构及热稳定性与性能的影响。根据我们相图研究的新成果以及经验，发现和合成新的Mn基三元化合物，关注Mn基体系中具有四方结构的新化合物（包括Heusler化合物），并对新化合物的结构和性能等进行研究。项目的研究属原创性探索，有原始创新的特点，将为研究和探索多功能、高性能的新型Heusler材料提供理论依据，同时，对开发利用我国和广西丰富的锰等有色金属矿产资源也有重要的经济价值和社会价值。

Heusler compounds are a remarkable class of intermetallic materials with excellent properties. Heusler materials can be formed by combination of the different elements including more half of the elements in the periodic table. They are in a field of active research because new properties and potential fields of applications emerge constantly. The purpose of this project is to study the phase diagrams of the Cr-Mn-Ga and Co-Mn-Ge ternary systems related to the tetragonal phases of Mn3−xTxGa and Mn3−xTxGe and the structures and physical properties of the compounds related to tetragonal Mn-based Heusler alloys. Systematically investigate the effects of the third elements T on the structures, thermal stability and properties on the tetragonal phases. Based on the new results of our investigations on alloy phase diagrams and on crystal structures and our experience, explore and synthesize new Mn-based ternary compounds. Attention will also be pay to the new compounds with tetragonal structures including Heusler compounds. Investigations on the magnetic, electrical and thermal expansion properties of the new compounds will be performed. The project manifests itself a character of initial innovation. The research results will provide basic guide for exploring multi-functional Heusler materials with excellent properties. The study result is very significant and valuable for developing and utilizing the abundant nonferrous metal resources such as Mn minerals ores in Guangxi province and our country.