Structure and Magnetoelasticity of R(Zn$_1 - rm x$Fe$_rm x$) ($hboxR=hboxTb$, Dy) Polycrystalline Alloys

The structure, magnetization, and magnetostriction of R(Zn
_1-x
Fe
_x
)(R=Tb, Dy) polycrystalline alloys were investigated by X-ray diffraction, vibrating sample magnetometry, and standard strain gauge techniques. It was found that TbZn
_1-x
Fe
_x
consists of a single Tb(Zn,Fe) phase with the cubic CsCl-type structure when x les 0.2. DyZn
_1-x
Fe
_x
was found to consist of nearly a single Dy(Zn,Fe) phase in the range 0 les x les 0.15. A second Dy-rich phase appears when x > 0.15. The Curie temperature of the RZn
_1-x
Fe
_x
alloys increases with increasing Fe content when x les 0.2. When Fe is substituted for Zn in RZn compounds, the magnetization increases with increasing Fe content. The magnetostriction of Tb(Zn
_1-x
Fe
_x
) alloys increases with increasing Fe content when x les 0.1, and that of Dy(Zn
_1-x
Fe
_x
) alloys increases in the composition range 0 les x les 0.05