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 R3 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).



Second Department


International Standard Serial Number (ISSN)


Document Type

Article - Journal

Document Version

Final Version

File Type





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

Publication Date

15 May 2002