Temperature dependence of Raman spectra was measured for polycrystalline [Ni(NH3)6](CI04)f and [Ni(NDJ)6](C104)2. Spectroscopic evidence for the phase transition at 173 K was obtained. The phase transition is evident in the splitting of some bands corresponding to the internal C10; ion vibrations and in characteristic intensity dependences of the bands. Some bands also showed a characteristic broadening with increasing temperature, which we interpret as being connected with stochastic reorientations of NH, groups and C10-ions. ' Two bands which were not resolved from the others at the room temperature study' were now evidenced at low temperatures.
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