The beneficial effect of the boron substitution on the magnetostrictive compound Tb0.7Pr0.3Fe2

The influence of a partial boron substitution on the crystal structure, Curie temperature, easy magnetization direction and magnetostriction of Tb 0.7 Pr 0.3 Fe 2 has been studied. The matrix of Tb 0.7 Pr 0.3 Fe 2 consists of the (Tb, Pr)Fe 2 phase with a cubic MgCu 2 -type structure coexisting with a large amount of the (Tb, Pr)Fe 3 phase with a rhombohedral PuNi 3 -type structure. The introduction of boron can effectively restrain the emergence of the iron-rich phase and thus the Tb 0.7 Pr 0.3 (Fe 1- x B x ) 2 alloys are essentially single phase compared with the boron free material. The linear magnetostriction at room temperature λ a = λ ∥ -λ ⊥ and T C pronouncedly increase with the boron substitution.