Abstract
The magnetostrictive properties and microstructure of Tb 0.27Dy 0.73Fe 2B x ( x=0, 0.05, 0.1, 0.15, 0.2) have been investigated. Measurement of magnetic properties, X-ray diffraction and magnetostriction were made on Tb 0.27Dy 0.73Fe 2B x polycrystalline samples prepared by arc melting. With the increase of boron content x, the iron-rich phase which leads to the detriment of magnetostrictive properties, decreases. The matrix phase of these alloys also has the MgCu 2 structure. The lattice constant and Curie transition temperature change only slightly. The doping of boron in the Tb 0.27Dy 0.73Fe 2 alloy can restrain the emergence of the iron-rich phase. The peritectic region probably shifts slightly with the addition of boron.
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