EFFECT OF V ON MICROSTRUCTURE AND MAGNETIC-PROPERTIES OF POLYCRYSTAL TB-DY-FE ALLOY

The systems of Tb1-XDyX(F1-YVY)(1.95) (X=0.73, 0.5, Y=0.051 0.10, 0.15 ) polycrystalline alloys have been studied using X-ray diffraction. BS E, EMPA-microanalysis, analysis of graphy, Co-57 Mossbauer spectra and magnetic measurements. The results indicate that the grains of the al loy have been broken down, the Laves phase has spread all over the mic tostructure and the Fe-rich phase has been increased by the addition o f V. The results of Hyperfine fields show that the Mossbauer spectra o f iron nuclei at room temperature have two sets of six-line patterns, with relative population 3:1. The easy direction of magnetization rema ins the [ill] direction when substituting V for Fe,V atoms occupy 16d sites, The addition of V changed the point of anisotropy compensation of the alloys to higher Tb content, improved the magnetostrictive prop erties significantly and increased Curie temperatures to 390-426 degre es C. (C) 1997 Elsevier Science S.A.