Magnetic Properties of Iron-Rich Mixed Rare-Earth Sm₂-ₓTbₓFe₁₇-YSi Y Compounds


A series of Sm2−xTbxFe17−ySiy solid solutions with x=0, 1, and 1.5 and y=1, 2, and 3 were prepared by induction melting stoichiometric amounts of high purity elements. The x-ray diffraction data confirm that the postannealed samples are 2:17 intermetallics of the Rmathm space group. The lattice parameters and the unit cell volumes were calculated using a modified Rietveld program. The fitted intensities showed behavior related to a disordered rhombohedral structure as inferred from neutron data. It was observed that for a particular y, the unit cell volume decreased almost linearly with increasing Tb content (x=0, 1, and 1.5). The unit cell volume decreases with increasing Si content (y) for a particular x as is also observed for the single rare-earth 2:17 compounds. The Curie temperature measurements show that with increasing Tb content x a decrease in the Curie temperatures of about 3% for y=1, 10% for y=2, and 15% for y=3 was observed. For a particular x, a nearly linear type increase in the Curie temperature resulted with increasing silicon content (y⩽3). It was observed that with increasing x there was a decrease of about 40% in the magnetization for y=1 and 2, whereas there was a decrease of about 35% for y=3. For a particular x, the magnetization decreased almost linearly with increasing Si content (y=1-3). © 2002 American Institute of Physics.



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© 2002 American Institute of Physics (AIP), All rights reserved.