Abstract
Abstract The 35Cl, 14N nuclear quadrupole resonance and nuclear quadrupole double resonance spectra have been measured in a number of systems exhibiting structural, incommensurate and commensurate ferroelectric phase transitions. In this contribution we illustrate the power of NQR spectroscopy for the study of the incommensurate and commensurate ferroelectric phases as well as for the study of structural phase transitions in models of biological membranes and related systems. We specifically studied the sequence of structural phase transitions in the Octylammonium N-Octylammoniumchloride layer structure compound and the Paraelectric to Ferroelectric transition in (CH3NH3)HgCl3. The dynamical properties of the above transitions are reflected in the temperature dependence of the NQR frequencies as well as in the time anomalous behaviour of the nuclear quadrupole spin-lattice relaxation times. From the above experimental data one can extract detailed information about the microscopic nature of the above transition.
Published Version
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