The Sm2Fe17Nx magnets were produced using heterogeneous diffusion and gas nitrogenation of 25% Sm-75% Fe mixture of powders. On decreasing the grain size to 0.97 micrometers the anisotropy constants K1 and K2 increase to 1.4 MJ/ cubic metres and 0.93 MJ/ cubic metres, respectively. Angular dependence of the coercivity can be understood as intermediate between the nucleation model and curling mechanism. On the basis of the domain structure observations, intrinsic magnetic properties were calculated. R
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