## 3 Results and Discussion
### Factors Affecting
#### 3.2.3 Effect of Temperature  
Similarly, to determine the effect of temperature on the structure, through the phase transition and crystallization process of Fe\({}_{63}\)Ni\({}_{32}\)Co\({}_{5}\) alloy, we only need to investigate the total energy value of the system and the number of crystal structure units of materials at the respective temperature. The obtained results are shown in Table 1.  
The obtained results show that, at temperature (T), T = 300 K, P = 0 GPa, the Fe\({}_{63}\)Ni\({}_{32}\)Co\({}_{5}\) alloy with 13,500 atoms have the lengths of the links with a constant value r = 2.475 A, and the g(r) of RDF changes in a corresponding way. In addition, the number of crystalline structure units (FCC, HCP, BCC) is 12,514 atoms; the size of the alloy (I) corresponds to 1 = 5.34 nm, the total energy of the system (E\({}_{\rm tot}\)), E\({}_{\rm tot}\) = \(-\)58,263 eV. When increasing the temperature from T = 300 K to T = 500, 700, 900, 1100, 1300 K, the RDF changes correspond separately with the corresponding decrease in the number of crystallographic units from 12,514 atoms to 12,496, 12,462, 12,389, 12,306, 12,137 atoms (Table 1). Moreover, the size of the alloy has a constant value r = 2.475 A, and the total energy of the system decrease from E\({}_{\rm tot}\) = \(-\)58,263 eV to E\({}_{\rm tot}\) = \(-\)57,941, \(-\)57,610, \(-\)57,275, \(-\)56,938, \(-\)56,630 eV (Table 1). The obtained results show that, when increased the temperature with Fe\({}_{63}\)Ni\({}_{32}\)Co\({}_{5}\) alloy of 13,500 atoms, the number of crystallographic units decreases, and Amor increases, indicating that Fe\({}_{63}\)Ni\({}_{32}\)Co\({}_{5}\) alloy of 13,500 atoms decreases, the crystallinity increase, and transfer gradually to the liquid state.  
In addition, the relationship between temperature and total energy of the system has a close relationship with each other when increasing temperature leads to increased energy (according to Figure 4).  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Temperature (K)** & **300** & **500** & **700** & **900** & **1100** & **1300** \\ \hline E\({}_{\rm tot}\) (eV) & \(-\)58,263 & \(-\)57,941 & \(-\)57,610 & \(-\)57,275 & \(-\)56,938 & \(-\)56,630 \\ \hline Number of crystalline structure units & 12,514 & 12,496 & 12,462 & 12,389 & 12,306 & 12,137 \\ \hline \hline \end{tabular}
\end{table}
Table 1: Parameters associated with the structure of Fe\({}_{63}\)Ni\({}_{32}\)Co\({}_{5}\) alloy with 13,500 atoms at different temperatures.  
Figure 4: Phase transition of Fe\({}_{63}\)Ni\({}_{32}\)Co\({}_{5}\) alloy in the function of the temperature.  
The results show that the relationship between T, E\({}_{\rm tot}\) has almost linear values and is interrupted at the point with the value T = 498 K. This point is called the glass point or glass temperature (T\({}_{\rm g}\)), T = T\({}_{\rm g}\) = 498 K. Moreover, some studies by the simulation study [22] confirmed that the cause of this phase transition is the size effect (surface effect). The obtained results are completely consistent with the experimental results with T\({}_{\rm g}\) = 498 K [77]. Based on these results, a major contribution to future experimental studies is determining the glass temperature of 3-component alloys (Figure 4).  
In addition, our computational studies show that, when increasing the concentration of Fe and Co doping, the crystallization process increases, and when increasing Ni, the crystallization process decreases. Similarly, increasing the number of atoms leads to an increase in the crystallization process, and as the temperature increases, the crystallization process decreases. These results show that, with Fe, Ni, and Co 3-metal alloys, the bond lengths are constant, while the energy increases with increasing temperature, and decreases with increasing of the number of atoms. These results can be applied in the manufacturing of magnetic nano-alloy materials.