Magnetic properties of Sm-2(Fe,Ti)(17) compounds and their nitrides with Th2Zn17 and Th2Ni17 structures

In Sm-2(Fe1-xTix)(17) compounds (x=0.02, 0.03, 0.04) the hexagonal Th2Ni17 structure has been stabilized at high temperatures. The type of crystal str ucture affects the magnetic properties of Sm-2(Fe,Ti)(17). For the Th2Ni17 structure, higher values of the Curie temperature and constants of planar m agnetocrystalline anisotropy than those for the Th2Zn17 structure are obser ved. For both structures, the substitution of Ti for Fe leads to growing im portance of the anisotropy constants of orders higher than second. No chang e in the type of structure is found upon nitrogenation. The hexagonal Sm-2( Fe,Ti)(17) nitrides as well as the rhombohedral nitrides show uniaxial anis otropy at room temperature. (C) 2000 Elsevier Science S.A. All rights reser ved.