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The effects of the partial substitution of element M(M=Cr,V,Mn,x=0.05;Zr,Ga,x=0.017;Si,x=0.15;Co,x=0.10)for Fe in samarium-iron-nitride Sm<sub>2</sub>(Fe<sub>1-x</sub>M<sub>x</sub>)<sub>17</sub>N<sub>y