Abstract
The composition dependence of crystal structure, lattice parameter, micromorphology, Curie temperatures, magnetocrystalline anisotropy constant of Tb0.29Dy0.48Ho0.23(Fe1-XMnX)1.95(x0.3) alloys were investigated by the experiment. X-ray diffraction patterns demonstrate the Tb0.29Dy0.48Ho0.23(Fe1-XMnX)1.95(x0.3) alloys possess MgCu2-type cubic Laves structure. The lattice parameter of Tb0.29Dy0.48Ho0.23(Fe1-XMnx)1.95alloy increases with increasing of x value. The Curie temperature Tcdecreases from 375°C for x=0 to 316 °C for x=0.05, 265°C for x=0.1. The magnetocrystalline anisotropy constant K1of Tb0.29Dy0.48Ho0.23(Fe1-xMnx)1.95(x0.3) decreases slightly with the increasing of x value. The magnetostriction was examined under applied magnetic field H in the room temperature. The Tb0.29Dy0.48Ho0.23(Fe1-xMnx)1.95(x0.2) alloys have the character of giant magnetostrictive in room temperature. With the increasing of Mn concentration, the magnetostrictive of Tb0.29Dy0.48Ho0.23(Fe1-xMnx)1.95(x0.2) alloy decreased.
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