1173K条件下稀土元素钕与铁和砷的相互作用研究

Study on the interaction of rare earth element neodymium,iron and arsenic at 1173K

主要研究了将钕和砷按克原子比1.0∶1.0封入H08钢缸体内,在1 173K保温50h后,通过光学显微镜,X射线衍射仪和扫描电镜能谱分析等测试方法,对试样中Nd-Fe-As高温相互作用进行分析。结果表明,二元化合物AsNd和FeAs2是Nd-Fe-As高温相互作用的主要产物,并且AsNd和FeAs2很可能是三元化合物NdFeAs形成的先决条件,而少量的Fe6Nd4为高温作用下钕铁化合物的混合物。在Nd-Fe-As高温相互作用体系内,各种物相之间存在着共生关系。通过对钕、铁和砷原子扩散系数的计算并结合扫描电镜和能谱微区分析,发现铁原子的扩散在该体系中占据了主导地位。

In this paper,Nd and As were sealed into the H08 steel cylinder at an atomic ratio of 1.0∶1.0.After incubation at 1 173 Kfor 50 h,the samples were tested by optical microscopy,X-ray diffraction and scanning electron microscopy in terms of high-temperature interaction of Nd,Fe and As.The results show that the binary compound AsNd and FeAs2 are the main products of high-temperature interaction of Nd,Fe and As.In addition,AsNd and FeAs2 are likely to be prerequisites of the formation of ternary compound NdFeAs,while a small amount of Fe6 Nd4 is the mixture of compounds Nd and Fe under high-temperature.In the Nd-Fe-As hightemperature interaction system,there are symbiotic relationships among various phases.Based on the calculation of diffusion coefficient of neodymium,iron and arsenic atoms and combination with scanning electron microscopy and energy spectrum analysis,it is found that the diffusion of iron atoms dominates the system.