## 3 Results and Discussion
### Factors Affecting
#### 3.2.1 Effect of Doping Concentration  
The obtained results show that, at temperature (T), T = 300 K, P = 0 GPa, the Fe\({}_{\rm 1-x-yNi_{x}Co_{y}}\) alloy with 13,500 atoms associated with x = 0.32, y = 0.63 (Fe\({}_{\rm 5}\)Ni\({}_{\rm 32}\)Co\({}_{\rm 63}\)) has 13,500 atoms (corresponding to 8505 Fe atoms, 4320 Ni atoms and 675 Co atoms), and its structure shape is shown in Figure 2a1. For this case, the lengths of the links r = 2.475 A and the g(r) of RDF is g(r)\({}_{\rm Fe-Ni}=7.01\), g(r)\({}_{\rm Fe-Co}=7.19\), and g(r)\({}_{\rm Ni-Co}=7.35\) (Figure 2b1). The number of the  
Figure 1: Shape (**a**), structure shape (**b**), RDF (**c**), number of structural unit (**d**) of Fe\({}_{\rm 63}\)Ni\({}_{\rm 32}\)Co\({}_{\rm 5}\) alloy at T = 300 K.  
structural unit is 7060 FCC, 4460 HCP, 575 BCC, and 1405 Amor as it is shown in Figure 2c1, the size of the alloy (I) corresponds to 1 = 5.34 nm, and the total energy of the system (E\({}_{\text{tot}}\)), E\({}_{\text{tot}}\) = \(-\)58,189 eV. When changes x = y (corresponding to x = y = 0.333) (Fe\({}_{33.4}\)Ni\({}_{33.5}\)Co\({}_{33.3}\)), and x = 0.32, y = 0.05 (Fe\({}_{63}\)Ni\({}_{32}\)Co\({}_{5}\)), the concentration of doped Fe increases, Co decreases corresponding to the number of atoms. The Fe, Ni, Co, and structural shape change major (Figure 2a1-a3). Similarly, links lengths do not change r = 2.475 A and the g(r) of RDF varies greatly between g(r)Fe-Ni = 6.42 to g(r)Fe-Ni = 7.32, g(r)Fe-Co = 6.60 to g(r)Fe-Co = 8.20, g(r)Ni-Co = 6.97 to g(r)Ni-Co = 7.35 (Figure 2b1-b3). Furthermore, with the increase of impurities Fe or Co both lead to an increase in g(r), which proves that Fe, Co metal has a smaller lattice constant than Ni metal (making honey larger atoms). In addition, the number of the structural unit varies greatly, corresponding to FCC decreasing and increasing, HCP increasing and decreasing, BCC increasing and decreasing, BCC increasing and decreasing, and Amor increasing and decreasing (Figure 2c1-c3) resulting in a change in the size of the alloy (I) that decreases from 1 = 5.34 to 1 = 5.33 nm, and the total energy of the system (E\({}_{\text{tot}}\)) increases and then decreases from E\({}_{\text{tot}}\) = \(-\)58,189 eV to \(-\)57,932 and \(-\)58,263 eV. The obtained results show that, when it is changed the doping concentration, the number of FCC, BCC, and Amor structural units increases (in Fe\({}_{5}\)Ni\({}_{32}\)Co\({}_{63}\), and Fe\({}_{63}\)Ni\({}_{32}\)Co\({}_{5}\)), which shows the fact when increasing the concentration of Fe, Co doping leads to Fe\({}_{1\times\gamma}\)Ni\({}_{\text{Co}}\)O\({}_{\gamma}\) alloy crystallization increases, but when increases the concentration of Ni doping, crystallization decreases. This is a difficult question for researchers as to why the difference in the crystallization process occurs when these metals are all magnetic metals, with nearly equal lattice constants. After the research process, we found that the root cause of this problem is caused by the electronic interaction between metals. In addition, with Fe\({}_{63}\)Ni\({}_{32}\)Co\({}_{5}\), there is the largest crystallization (corresponding to the total binding energy of the system that has the smallest value). The obtained results have an important impact on future experimental studies on the influence of doping concentration with 3-metal alloys. We choose Fe\({}_{63}\)Ni\({}_{32}\)Co\({}_{5}\) alloy as the standard material to investigate the influencing factors in the next section.  
Figure 2: Structure shape (**a1–a3**), RDF (**b1–b3**), number of the structural unit (**c1–c3**) of Fe\({}_{1\times\gamma}\)Ni\({}_{\text{x}}\)Co\({}_{\gamma}\) alloy at T = 300 K, P = 0 GPa with different adulteration.