Abstract
The structural and magnetic properties of the Gd2Fe17Dx compounds (x = 0, 3, and5) have been investigated by means of x-ray powder diffraction, high energyinelastic neutron scattering and magnetic measurements. The Gd2Fe17Dxcompounds crystallize in the R-3m space group with the Th2Zn17-like structure.The increase of the lattice parameters with D content reveals a two-stepfilling of the interstitial sites with deuterium first filling the octahedral9e sites for x = 3 and then partially filling the tetrahedral 18g sites for x = 5.The evolution of the Jex exchange coupling versus the deuterium (D) content isdiscussed. Although it is well known that the permanent magnet properties ofD-doped samples are considerably better than those of the pure compoundGd2Fe17 there is a reduction in the Gd-Fe exchange field. Finally, theinfluence of deuterium insertion on the exchange interaction between the Gdand Fe sublattice is compared to that of nitrogen (N) or carbon (C). The C andN atoms are found to be more efficient in reducing the intersublatticecoupling.
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