Phase states and structural phase transition in Fe<sub>73</sub>Ga<sub>27</sub>RE<sub>0.5</sub> alloys (RE = Dy, Er, Tb, Yb) alloys: a neutron diffraction study

New data on phase states and structural phase transitions in alloys Fe73Ga27 alloys doped with Dy, Er, Tb, and Yb in an amount of ~0.5 at% are presented. Structural data were obtained in neutron diffraction experiments performed with high resolution and in continuous temperature scanning mode during heating to 850°C and subsequent cooling at a rate of ±2°C/min. It has been established that both the sequence of forming and disappearing structural phases and the final state of the alloy depend on the type of rare earth element. Phase transitions in the alloy with Dy are similar to those in the initial Fe73Ga27 alloy, excluding the final state. The procedure of doping with Er and Tb leads to the formation of disordered A1 and A3 phases instead of the L12 and D019 ordered close packed phases, respectively. In the case of doping with Yb, neither of the above phases is observed. The formation of the L60 (m-D03) and D022 tetragonal structural phases previously discovered in similar alloys by the electron diffraction method is not confirmed.