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The spin configuration and magnetostrictive properties of TbₓDy₀.₇₋ ₓPr₀.₃(Fe₀.₉B₀.₁)₁.₉₃ (0.10≤x ≤ 0.28)  Laves compounds are investigated. The spin phase diagram for the compounds is constructed to illustrate both the composition dependence of the Curie point T[sub c] and spin reorientation temperature T[sub SR] and the arrangement for the easy magnetization direction (EMD) . It is found that when x is increased from 0.16 to 0.28, T[sub c] increases from 617 to 623 K, while T[sub SR] decreases from 375 to 160 K at which the EMD reorients from  100   to 111   axis. The magnetization and magnetostriction of the compounds are measured as a function of applied field. The magnetocrystalline anisotropy constant K₁ and the ratio λα/K₁ reach a minimum and a maximum value at x=0.22, respectively. The single phase Tb₀.₂₂Dy₀.₄₈Pr₀.₃(Fe₀.₉B₀.₁) ₁.₉₃ compound has the lowest magnetocrystalline anisotropy, the highest magnetostriction to anisotropy ratio, and a large spontaneous magnetostriction  λ₁₁₁of ~ 1500 ppm at room temperature. In view of these properties, the compound is a promising magnetostrictive material.Department of Applied PhysicsAuthor name used in this publication: W. LiuAuthor name used in this publication: S. W. O

Spin configuration and magnetostrictive properties of Laves compounds TbxDy0.7−xPr0.3(Fe0.9B0.1)1.93(0.10⩽x⩽0.28)