The structure, magnetostriction, and anisotropy compensation of $(Tb1−xPrx)(Fe0.4Co0.6)1.9$ alloys

The structure, magnetostriction, and anisotropy compensation of $(Tb1−xPrx)(Fe0.4Co0.6)1.9$ $(0⩽x⩽1)$ alloys were investigated. It was found that the matrix of $(Tb1−xPrx)(Fe0.4Co0.6)1.9$ alloys is a $(Tb,Pr)(Fe,Co)2$ phase with a $MgCu2$-type cubic Laves structure, and a second phase of small amount is a $(Tb,Pr)(Fe,Co)3$ phase when $x⩽0.2$ and $x=0.5$ and 1.0. In the range $0.2<x⩽0.4,$ the amount of the $(Tb,Pr)(Fe,Co)3$ phase with a $PuNi3$-type structure increases with increasing $x$ and becomes the main phase when $x=0.4.$ When $0.5<x⩽0.6,$ the $(Tb,Pr)(Fe,Co)3$ phase increases sharply, whereas the $0.6<x⩽0.8,$ it decreases with increasing $x.$ The spontaneous magnetostriction $λ111$ of the alloys exhibits a peak near $x=0.8 (λ111=2370×10−6).$ The magnetostriction $|λ∥−λ⊥|$ at room temperature was also examined.