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NMR study of cation motions in ferroic [C(NH2)3]3Bi2Br9.
Autorzy
Rok wydania
2000
Czasopismo
Zeitschrift für Naturforschung Section A: A Journal of Physical Sciences
Numer woluminu
55a
Strony
570-574
DOI
10.1515/zna-2000-6-702
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The proton NMR second moment and spin-lattice relaxation time of polycrystalline [C(NH2)3]3Bi2Br9 were studied in a wide-temperature range. Dynamical inequivalence of two crystallographically different guanidinium cations has been revealed . The C3 reorientation of the two types of cations was found to be hindered by different potential barriers (25.1 kJ/mol and 34.7 kJ/mol). At higher temperatures an overall reorientation of the cations was revealed. The existence and order-disorder character of the phase transitions at 333, 350, 415, and 425 K have been confirmed.
Słowa kluczowe
Phase Transitions, Nuclear Magnetic Resonance
Adres publiczny
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