Effects of Gd substitution on the metamagnetic transition of NdCo 9.5 V 2.5

Abstract Crystal structure and magnetic properties of the Nd 1− x Gd x Co 9.5 V 2.5 compounds ( x =0–1) have been investigated. The compounds crystallize in the tetragonal ThMn 12 structure with space group I 4/ mmm . The lattice parameters a , c and the unit cell volume V decrease with the increase of Gd content. The Curie temperature of Nd 1− x Gd x Co 9.5 V 2.5 increases monotonically upon the substitution of Gd for Nd. The critical field H C r i t L required to induce the magnetization jump decreases with increasing Gd content. The metamagnetic transition phenomenon becomes less obvious and even disappears with the substitution of Gd for Nd. The H C r i t H required for the metamagnetic transition increased with increasing Gd content at low substitution content. The saturation moment M S of the compounds decreases first then increases with the increased Gd content.