Abstract
High Pr-content (Tb0.2Pr0.8)(Fe0.4Co0.6)1.93−xBx magnetostrictive alloys (0.05⩽x⩽0.15) with a single cubic Laves phase were synthesized by arc-melting and subsequent annealing. The Curie temperature, Tc, and the lattice parameter, a, of the Laves phase in the alloys increase with increasing the boron content up to x=0.10, which is ascribed to the preferential occupation of boronin the interstitial sites of the Laves phase. The addition of a small amount of boron to the(Tb0.2Pr0.8)(Fe0.4Co0.6)1.93 alloy reduces the magnetocrystalline anisotropy constant K1 and improves the magnetostriction λa=λ‖−λ⊥ at relatively low magnetic fields at room temperature. The composition dependence of the ratio λa∕K1 for (Tb0.2Pr0.8)(Fe0.4Co0.6)1.93−xBx alloys reaches a maximum value at x=0.10, suggesting that the (Tb0.2Pr0.8)(Fe0.4Co0.6)1.83B0.1 alloy should be a good candidate material for magnetostriction applications.
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