Structure and magnetostriction of R(Fe1−xAlx)2 alloys (R  Dy0.65Tb0.25Pr0.1)

The structure, Curie temperature and magnetostriction of R(Fe1−xAlx)2 alloys (R  Dy0.65Tb0.65Pr0.1) (x ⩽ 0.3) have been investigated. It was found that the matrix structure of R(Fe1−xAlx)2 alloys is cubic Laves (Dy,Tb,Pr)(Fe,Al)2. Its lattice parameter increases linearly, while the Curie temperature decreases, with increasing x. The second phase of PuNi3-type (Dy,Tb,Pr)(Fe,Al)3 was found when x < 0.15. The magnetostriction of R(Fe1−xAlx)2 alloys decreases with increasing x in high magnetic fields; however, it exhibits a peak at x = 0.05 in low magnetic fields (H ⩽ 2 kOe).