Structural and magnetic properties of pseudobinary system Zesub(1-x)Mosub(x)Fe2

Crystallographic, magnetic and Mössbauer studies on Zr 1- x Mo x Fe 2 are reported. Crystal structure changes with increasing x from MgCu 2 type (x ≦0.15) to MgZn 2 type (x ≧0.25). Magnetic moment of Fe estimated from magnetization is nearly unchanged (≈1.6 µB) in x ≦0.15 and decreases considerably in x ≧0.2. Mössbauer spectra at 78 K showed the existence of Fe with hyperfine fields of 217 and 199 kOe in Zr 0.9 Mo 0.1 Fe 2 and of Fe with 99 and 0 kOe in Zr 0.75 Mo 0.25 Fe 2. Magnetic properties of MgZn 2 type compounds Zr 0.7 Mo 0.3 Fe y and Zr 0.5 Mo 0.5 Fe y change from weak ferromagnetism for y =2.0 to paramagnetism for y =1.6.