Structural and magnetic properties of RCo12-xTix (R = Y and Sm) and YFe12-xTix compounds

Magnetic and structural properties of RCo12-xTix With R = Y and Sm and YFe1 2-xTix compounds have been investigated by using x-ray diffraction and magn etic measurements. It was found that all compounds investigated are almost single phase with the ThMn12-type structure. X-ray diffraction patterns of magnetically aligned powder samples indicate that the easy magnetization di rections (EMD) at room temperature are in the basal plane for SmCo12-xTix c ompounds while for YCo12-xTix and YFe12-xTix compounds the EMDs are along t he c-axis. The lattice parameters increase monotonically with increasing Ti content for all the compounds investigated. The Curie temperature Te decre ases monotonically with increasing Ti content for both YCo12-xTix and SmCo1 2-xTix, while T-C of YFe12-xTix is almost independent of Ti content. The sa turation magnetization M-s decreases with increasing Ti content for all the three systems. The anisotropy field B-a of YCo12-xTix and YFe12-xTix compo unds decreases monotonically with increasing Ti content, while the Ti conte nt dependence of the anisotropy fields B-a for SmCo12-xTix compounds at 1.5 K exhibits a maximum at about x = 1.7, which can be understood in terms of a two-sublattice model of anisotropy.