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• W2069531236 abstract "Deuterium nuclear magnetic resonance (2D NMR) investigations are performed in order to get information about structural changes of the hydrogen bonds for deuterated crystals of trissarcosine calcium chloride (TSCC) near the ferroelectric phase transition at Tc = 130 K. The electric field gradient (efg) tensors at the deuterium sites in the hydrogen bonds are determined at room temperature by measuring the angular dependence of the spectra for rotations around the three crystallographic axes. Near the phase transition (Tc − T = 5 K) the positions of the 2D NMR lines change in an interval of about 10 kHz. These changes can be explained through a rotation of the efg tensor by an angle of about 4° at 125 K. The interpretation is in agreement with results from 1H ENDOR and 13C ENDOR measurements of TSCC crystals doped with Mn2+ according to which a static rotation of sarcosine molecules occurs at the phase transition giving rise also to the spontaneous polarization.Es werden kernmagnetische Resonanzuntersuchungen des Deuteriums (2D-NMR) durchgefuhrt, um Informationen uber strukturelle Anderungen der Wasserstoffbrucken von deuterierten Kristallen von Tris-sarcosincalciumchlorid (TSCC) nahe am ferroelektrischen Phasenubergang bei Tc = 130 K zu erhalten. Bei Raumtemperatur wird der elektrische Feldgradienten-Tensor durch Messung der Winkelabhangigkeiten der Spektren bei Drehung um die drei kristallographischen Achsen bestimmt. In der Nahe des Phasenuberganges (Tc − T = 5 K) verschieben sich die 2D-;NMR-Linien in einem Intervall von ca. 10 kHz. Diese Anderungen konnen durch eine Drehung des Feldgradienten-Tensors um einen Winkel von annahernd 4° bei 125 K erklart werden. Diese Interpretation ist im Einklang mit Ergebnissen von 1H und 13C-ENDOR-Messungen an Mn2+-dotierten TSCC-Kristallen, gemas denen eine statische Rotation der Sarcosin-sMolekule auftritt und die am Phasenubergang zur Entstehung der spontanen Polarisation fuhrt." @default.
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• W2069531236 date "1987-02-01" @default.
• W2069531236 modified "2023-09-23" @default.
• W2069531236 title "2D NMR Study near the Ferroelectric Phase Transition of TSCC" @default.
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• W2069531236 doi "https://doi.org/10.1002/pssb.2221390226" @default.
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