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Inne
NMR study of phase transition in new ferroelectric crystal—(C5H5NH)5Bi2Br11.
Autorzy
Rok wydania
2002
Czasopismo
Solid State Nuclear Magnetic Resonance
Numer woluminu
21
Strony
44-52
DOI
10.1006/snmr.2001.0041
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
A T1 minimum at 216 K for Larmor frequency 90 MHz has been detected and for this minimum no analogous T1 minimum according to the known quadratic dependence of the Larmor frequency 25 MHz is found. The analysis leads to the conclusion that this T1 minimum is a result of the relaxation of protons via quadrupole nuclei. The Kimmich theoretical treatment of 1H NMR experiments exhibiting the existence of this phenomenon in the case of relaxation of protons of piridinium cations in (C5H5NH)5Bi2Br11 and the estimated averaged quadrupole frequency of interacting quadrupole nuclei has been estimated to be around 71 MHz. Below the phase transition at 118 K a wide symmetric spin-lattice relaxation minimum at 25 MHz is detected and a model of small angle libration of the pyridinium cation has been applied to explain the observed T1 relaxation time minimum.
Słowa kluczowe
pyridinium cation, relaxation time, second moment of NMR line
Adres publiczny
https://doi.org/10.1006/snmr.2001.0041
Strona internetowa wydawcy
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