ANALOGOUS SM-TI-FE HIGH-COERCIVITY PHASES IN SM-V-FE AND SM-ZR-FE SPUTTERED FILM SAMPLES

A phase with high room-temperature coercivity has been synthesized in sputtered film samples of Sm-Fe V. The samples of SmFeV and SmFeZr have been processed as was SmFeTi to first produce a high room-temperature coercivity of 38.5 kOe. The observed intrinsic coercivity (i)H(c) for Sm:Fe:V = 19.6:73.5:6.9 atomic was 15.8 kOe at 293 K with a rise to 31 kOe at 6 K. The 4-pi-M at 293 K for an applied field of 90 kOe was 6.2 kG. When this sample was cooled in an applied field of 90 kOe, the 4-pi-M rose smoothly to 7.9 kG at 6 K. The x-ray patterns for SmFeV were similar to the high (i)H(c) Sm-Fe-Ti which we have reported. All the observed x-ray-diffraction lines can be fit to the large-cell 5-17 Nd-Fe binary structure. In contrast to this, the Sm-Fe-Zr phase at a similar composition showed a readily indexed x-ray pattern of TbCu7 type with a = 5.109 angstrom and c = 4.074 angstrom with no unaccounted lines. The Sm:Fe:Zr atomic composition was 19.9:72.0:8.1. The Sm-Fe-Zr 4-pi-M at 18 kOe was 6.2 kG and the coercivity was 6.7 kOe as measured at 293 K. Values of (i)H(c) for SmFe(Ti,V) intermediate compositions of 46 kOe have been measured at 293 K.