Abstract
The pressure-composition isotherm of the Sm 2Fe 17N system was measured volumetrically at 823 K. The data strongly suggest the formation of a nitrogen solid solution with the solubility limit lying at a nitrogen concentration [N]/[Sm 2Fe 17] = 3 in mole ratio and a nitride phase with the composition Sm 2Fe 17N 6. More marked anisotropic changes in the lattice structure seem to take place in the formation of the solid solution phase at [N]/[Sm 2Fe 17] < 3 than at 3 < [N]/[Sm 2Fe 17] < 6, where two phases, namely a nitrogen-saturated solid solution and a nitride, would seem to coexist.
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