Mao Juncheng, Huang Run, Fu Chenghui, Lv Xiaodong, He Lihua, Zhang Jinzhu
School of Materials and Metallurgy, Guizhou University, Guiyang, 550025, People's Republic of China.
Guizhou Province Key Laboratory of Metallurgical Engineering and Energy Process Saving, Guiyang, 550025, People's Republic of China.
Sci Rep. 2021 Feb 19;11(1):4264. doi: 10.1038/s41598-021-83698-9.
In this study, neodymium and arsenic were sealed into industrial pure iron cylinders at a temperature of 1223 K for 50 h. The interaction mechanism of the Nd-Fe-As system at various atomic ratios was investigated by optical microscopy, X-ray diffractometry, and scanning electron microscopy. Binary compounds FeAs, NdAs, FeAs, and FeNd were the main products formed, with traces of NdFeAs compounds. In addition, at high temperatures, As content affected the diffusion of Fe atoms; the diffusion of Fe increased with an increase in the atomic ratio. Furthermore, the diffusion ability of Nd was weaker than that of As. The major diffusion mechanism of Nd was through the Fe atomic vacancy mechanism. As mainly bind to Fe to form Fe and As compounds. The formation of ternary compounds was confirmed by laboratory experiments and mismatch calculations.
在本研究中，将钕和砷在1223 K的温度下密封于工业纯铁圆筒中50小时。通过光学显微镜、X射线衍射仪和扫描电子显微镜研究了不同原子比下Nd-Fe-As体系的相互作用机制。二元化合物FeAs、NdAs、FeAs和FeNd是形成的主要产物，还有微量的NdFeAs化合物。此外，在高温下，砷含量影响铁原子的扩散；铁的扩散随着原子比的增加而增加。此外，钕的扩散能力比砷弱。钕的主要扩散机制是通过铁原子空位机制。砷主要与铁结合形成铁和砷的化合物。通过实验室实验和失配计算证实了三元化合物的形成。
