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A Mossbauer study of Sm2Fe14Ga3C x (x=0-2.5)

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7 Author(s)
Li, Hong‐Shuo ; Sch. of Phys., New South Wales Univ., Sydney, NSW, Australia ; Suharyana ; Cadogan, J.M. ; Hu, Bo‐Ping
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57Fe Mossbauer spectra of Sm2Fe14Ga3Cx (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≠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±0.8 T; whereas for 18 h site it is only 2.7±0.1 T. The average hyperfine field <Hhf> carbon content, which that the average Fe magnetic moment is largely unaffected by the introduction of carbon. Using a conversion factor of 15 T/μB, the average Fe atomic magnetic moment in Sm2Fe14Ga3 is about 1.47 μB at 293 K. The volume expansion resulting from the introduction of carbon leads to a slight increase in the weighted average of the 57Fe isomer shift

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Magnetics, IEEE Transactions on  (Volume:31 ,  Issue: 6 )