The effects of boron on the magnetostrictive properties of Tb 0.27Dy 0.73Fe 2

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 the arc melting technique. With the increase of boron context x, the iron-rich phase which leads to the detriment of magnetostrictive properties decreases obviously. The matrix phase of these alloys also has an MgCu 2 structure type. The lattice constant and Curie transition temperature change only slightly. Doping of boron in the Tb 0.27Dy 0.73Fe 2 alloy can restrain the emergence of an iron-rich phase. The peritectic action point either shifts slightly or the peritectic action is promoted by boron.