Quadrupole Relaxation of 79Br Nuclei in Ferroelectric (CH3)4NCdBr3 (TMCB) |
| D.F. Baisa, E.D. Chesnokov Institute of Physics, Ukrainian Acad. Sci., Prospekt Nauki 46, 252028 Kiev, Ukraine and Z. Czapla Institute of Experimental Physics, University of Wrocław, M. Borna 9, 50-204 Wrocław, Poland |
| Received: April 13, 1994 |
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| Investigations of temperature dependence of a nuclear quadrupole spin-lattice relaxation time of 79Br nuclei in ferroelectric (CH3)4NCdBr3 are presented. It is shown that in paraelectric phase in the vicinity of phase transition temperature relaxation process is determined by critical fluctuations of electric field gradient. In ferroelectric phase relaxation is related to three different mechanisms, namely: lattice vibrations, CH3¯ group reorientations and TMA cation motions. According to the results of measurements it is concluded that the phase transition is connected with ordering of TMA cations. |
| DOI: 10.12693/APhysPolA.86.357 PACS numbers: 64.70.Kb |