Bg. Shen et al., EFFECTS OF GA SUBSTITUTION ON THE HARD MAGNETIC-PROPERTIES OF THE SM2F17C1.5 COMPOUNDS, Journal of magnetism and magnetic materials, 153(3), 1996, pp. 332-336
A systematic investigation of the structure and magnetic properties of
are-melted and as-quenched Sm2Fe17-xGaxC1.5 samples with 0 less than
or equal to x less than or equal to 6 has been made by X-ray diffracti
on and magnetic measurements. X-ray diffraction studies have shown tha
t these samples crystallize in the rhombohedral Th2Zn17-type structure
. The unit-cell volumes upsilon of Sm2Fe17-xGaxC1.5 compounds increase
monotonically with increasing Ga concentration. The Ga-concentration
dependence of the Curie temperature T-C exhibits a maximum value of 63
3 K at about x=2. The room-temperature saturation magnetization M(s) d
ecreases monotonically with increasing Ga concentration, The Sm2Fe17-x
GaxC1.5 compounds exhibit an easy c-axis anisotropy at room temperatur
e. The anisotropy field is found first to increase and then to decreas
e with increasing x, having a maximum value of 130 kOe at about x=2. T
he coercivities of 13.0-16.0 kOe are obtained in as-quenched Sm2Fe17-x
GaxC1.5 (x=2 and 3) ribbons prepared at the speeds of 15-30 m/s at roo
m temperature. The substitution of Ga in Sm2Fe17C1.5 not only stabiliz
es the hard magnetic phase but also leads to the increase in coercivit
y.