Abstract
The Raman line shape of the symmetric stretching vibration of the dimethylammonium (DMA) group at 890 cm -1 in the spectrum for a [(CH 3 ) 2 NH 2 ] 5 Cd 3 Cl 11 (DMAPCC) crystal was analyzed. The temperature dependence of this vibration mode is explained in terms of the motional narrowing due to the disordered NH 2 group in DMA(3), which results in splitting of the DMA(2) line in the internal mode region. The disorder mechanism is discussed by comparing the results with the two relaxation times obtained from the dielectric dispersion data.
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