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The lattice dynamics of crystalline [Ni(NH 3 ) 6 ] (ClO 4 ) 2 , [Ni(NH 3 ) 6 ] (BF 4 ) 2 , and [Ni(NH 3 ) 6 ] (PF 6 ) 2  is studied in the framework of the point charge model. Phonon frequencies, in six high‐symmetry directions, and elastic constants are calculated. Good agreement with the experimental data for Raman active frequencies is achieved.