Structure and Magnetic Properties of R(FeVB)12 Compounds.

Stable R(FeVB)(12) compounds (R=Nd, Sm, Y) with the ThMn12-type tetragonal structure have been prepared. The Curie temperatures of these compounds are enhanced compared with the boron-free compounds. In some of these compounds the saturation magnetization at 4.2 K is also increased. A spin reorientation is observed at 130 K in Nd(FeVB)(12). FOMP transitions occur at 4.2 K in both Sm(FeVB)(12) and Nd(FeVB)(12) compounds, with onset fields of 11.5 T and 2.2 T, respectively.