Synthesis Crystallographic, and Magnetic Properties of New Nitrided Hard Magnetic Materials

将研究间隙氮对新型稀土-铁-氮磁体晶体结构和磁结构的影响，以及钴、镍、锰、铝和硅对这些氮化物中铁的替代作用。用中子衍射法测定替代元素在晶体结构中不同位置上的优先占位。中子衍射和穆斯堡尔谱学都将被用来确定这些化合物的磁性结构，并揭示随着合成方法和加工技术的变化，每个不同铁位的详细磁性行为。来自中子衍射和穆斯堡尔谱的微观结构信息将与磁测量确定的块体性质相关联。详细了解间隙氮和替代元素如何影响铁和稀土的磁性相互作用，将是开发更好的磁体的重要一步。

The effects of interstitial nitrogen on the crystal and magnetic structures of new rare earth-iron-nitrogen magnets as well as the effects of cobalt nickel, manganese, aluminum, and silicon substitution for iron in these nitrided compounds will be studied. Neutron diffraction will be used to determine preferential occupancies of the substitutional elements on the different sites in crystal structure. Both neutron diffraction and Mossbauer spectroscopy will be used to determine the magnetics structures of these compounds and to reveal the detailed magnetic behavior at each of the different iron sites as a function of synthetic methods and processing techniques. The microscopic structural information from neutron diffraction and Mossbauer spectroscopy will be correlated with bulk properties as determined by magnetic measurements. Understanding in detail how the interstitial nitrogen and substitutional elements affect the iron and rare earth magnetic interactions will be an important step towards developing even better magnets.