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- W2123742772 abstract "The nuclear spin–lattice relaxation time T1 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. 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.Es wird die Kernspin-Gitter-Relaxationszeit T1 von Protonen in Einkristallen der Was- serstoff-gebundenen Ferroelektrika Colemanit, KFCT und TGS zwischen 8 und 60 MHz mit 90°-t −900°-Impulsfolgen zwischen +8O °C und −100 °C gemessen. In allen Kristallen enthalt die Relaxationsrate T verschiedene Beitrage. Dem generellen Verlauf entsprechend einer oder zweier BPP-Abhangigkeiten, ans denen die zugehorigen Aktivierungs- energien berechnet werden, ist in der Nahe des ferroelektrischen Umwandlungspunktes ein weiterer ferroelektrischer Beitrag uberlagort. Die zugehorige Relaxationsrate zeigt in Colemanit und KFCT eine frequenzunabhangige logarithmische Singularitat, wahrend sich in TGS ein komplizierteres Verhalten ergibt. Fur Colemanit und KFCT werden die Ergebnisse mit Hilfe bestehender Theorien gedeutet, wahrend zur Beschreibung von TGS verschiedene Modelle diskutiert werden." @default.
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- W2123742772 date "1974-03-01" @default.
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- W2123742772 title "Proton Spin–Lattice Relaxation in the Hydrogen-Bonded Ferroelectrics Colemanite, KFCT, and TGS" @default.
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- W2123742772 doi "https://doi.org/10.1002/pssb.2220620109" @default.
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