Crystal structure and magnetic properties of SmCo5.85Si0.90 compound.

Authors :: Luo, J.
Liang, J. K.
Guo, Y. Q.
Liu, Q. L.
Yang, L. T.
Liu, F. S.
Rao, G. H.
Source :: Applied Physics Letters; 4/19/2004, Vol. 84 Issue 16, p3094-3096, 3p, 1 Chart, 4 Graphs
Publication Year :: 2004
Abstract: The crystal structure and magnetic properties of SmCo<subscript>7-x</subscript>Si<subscript>x</subscript> (x=0.1–0.9) compounds were studied by means of x-ray powder diffraction and magnetic measurements. Rietveld refinement of x-ray powder diffraction pattern shows that the as-cast compound SmCo<subscript>7-x</subscript>Si<subscript>x</subscript> with x=0.9 crystallizes in the TbCu<subscript>7</subscript>-type structure with the space group P6/mmm, and the doping element Si has a distinct preference to occupy the 3g site. According to the refinement result, the composition of the compound is derived as SmCo<subscript>5.85</subscript>Si<subscript>0.90</subscript>. The compound SmCo<subscript>5.85</subscript>Si<subscript>0.90</subscript> exhibits ferromagnetic order with the Curie temperature of about 717 K and a saturation moment of about 6.58±0.05 μ<subscript>B</subscript>/f.u. The SmCo<subscript>5.85</subscript>Si<subscript>0.90</subscript> compound shows a strong uniaxial magnetocrystalline anisotropy, and an anomalous increase of magnetization at low temperature is observed in an external field applied perpendicular to the easy direction of magnetization. © 2004 American Institute of Physics. [ABSTRACT FROM AUTHOR]