A Mossbauer study of Sm/sub 2/Fe/sub 14/Ga/sub 3/C/sub x/ (x=0-2.5)

/sup 57/Fe Mossbauer spectra of Sm/sub 2/Fe/sub 14/Ga/sub 3/C/sub x/ (x=0, 0.5, 1.0, 1.5, 2.0, 2.5) collected at 293 K have simplified fitting model of four (for x=0) or six (for x/spl ne/0) broadened sextets which ignores the local Ga environment of each Fe site. Our analyses show that the strong Ga preferential occupation of 18 h site model results in the best fit to the experimental spectrum, The values of the hyperfine field of four sextets with zero neighbouring carbon are virtually constant for all namely, 28.7(5), 22.9(5), 20.8(5) and 20.3(5) T. The reduction in hyperfine field with one neighbouring carbon for 18 f site is 6.3/spl plusmn/0.8 T; whereas for 18 h site it is only 2.7/spl plusmn/0.1 T. The average hyperfine field

carbon content, which that the average Fe magnetic moment is largely unaffected by the introduction of carbon. Using a conversion factor of 15 T//spl mu/B, the average Fe atomic magnetic moment in Sm/sub 2/Fe/sub 14/Ga/sub 3/ is about 1.47 /spl mu/B at 293 K. The volume expansion resulting from the introduction of carbon leads to a slight increase in the weighted average of the /sup 57/Fe isomer shift.