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Proton Spin–Lattice Relaxation in the Hydrogen‐Bonded Ferroelectrics Colemanite, KFCT, and TGS
Author(s) -
Brosowski G.,
Buchheit W.,
Müller D.,
Petersson J.
Publication year - 1974
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220620109
Subject(s) - ferroelectricity , materials science , proton , condensed matter physics , relaxation (psychology) , lattice (music) , hydrogen , spin–lattice relaxation , nuclear magnetic resonance , physics , nuclear physics , quantum mechanics , psychology , social psychology , optoelectronics , dielectric , acoustics
The nuclear spin–lattice relaxation time T 1 of protons in single crystals of the hydrogen‐bonded ferroelectrics colemanite, KFCT, and TGS is measured between 8 and 60 MHz and between +80 °C and −100 °C by applying 90°‐ t −90° pulse sequences. In all crystals there are several contributions to the relaxation rate T 1 −1 . Near the ferroelectric transition a ferroelectric contribution appears which is superimposed on a general behaviour according to one or two BPP type curves from which the corresponding activation energies are estimated. In colemanite and KFCT the ferroelectric relaxation rate shows a. frequency independent logarithmic singularity whereas in TGS a more complicated behaviour is observed. With respect to colemanite and KFCT these results are interpreted by applying established theories whereas for describing the behaviour of TGS several models are discussed.