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We report the crystal structure of Nd-Fe alloys as candidates for grain-boundary phases in Nd-Fe-B sintered magnets. We find that the crystal structure of the fluorite Nd-Fe alloys is stable for a wide composition range. We also demonstrate that solid solution of Ga is effective in stabilizing the fluorite crystal structure of Nd-Fe alloys, which is consistent with experimental observations reporting crystalline Nd-Fe alloys at the grain boundaries of Ga-added Nd-Fe-B permanent magnets.doi:10.7567/1882-0786/ab626e fatcat:6ttgij7drndkpjjfkvnvf7jwh4