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Inne
Molecular motions in a novel ferroelectric crystal (CH3NH3)5Bi2Br11 studied by NMR.
Autorzy
Rok wydania
1989
Czasopismo
Numer woluminu
72
Strony
585-587
DOI
10.1016/0038-1098(89)91038-7
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The temperature dependence of the 1H relaxation times T1, T1ρ and T1D were studied in the ferroelectric (CH3NH3)5Bi2Br11. Three kinds of motions of the methylammonium cation, i.e. (1) rotations of the CH3 and NH3 groups about C3 axis, (2) reorientation of the whole cation about C3 axis forming an angle α = 13° with the C3 axis of NH3 and CH3 groups, (3) 180° flip motion of the methylammonium cation, have been observed separately. The small activation energies of these motions imply that the cations experience a weak crystal field.
Adres publiczny
https://doi.org/10.1016/0038-1098(89)91038-7
Strona internetowa wydawcy
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