INVESTIGATION OF THE STRUCTURAL-PROPERTIES OF CRYSTALLIZED FE-(CU)-SM-B RIBBONS

Crystallized Fe-(Cu)-Sm-B ribbons were investigated by means of X-ray diffraction, differential scanning calorimetry and Mossbauer spectrome try. The bcc alpha-Fe, tetragonal Fe3B and tetragonal Fe2B phases were found to crystallize after appropriate annealing. The relative propor tion of alpha-Fe decreases with increasing Sm content, in agreement wi th the increase of the crystallization point. The metastable Fe3B phas e decomposition into alpha-Fe and Fe2B was observed within a wide rang e of annealing temperature. The Sm ions randomly accommodate the Fe si tes in the Fe3B lattice. After cumulative annealing at higher temperat ures, the tetragonal Sm1.1Fe4B4 paramagnetic phase is found.