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Inne
Vibrational study of the structural phase transitions in the (CH3ND3)3Sb2Br9 (d-MABA) crystals by infrared spectroscopy.
Autorzy
Rok wydania
2001
Czasopismo
Numer woluminu
25
Strony
101-113
DOI
10.1016/S0924-2031(00)00112-0
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Infrared spectra in the region of the internal vibrations of methylammonium cation (4000 and 400 cm−1) around the phase transitions at Tc1=166 K and Tc2=129 K of the deuterated analogue of MABA are presented and discussed. A detail analysis has been performed for the bands assigned to the stretching and deformation vibrations of the ND3+ groups. The self-diffusion theory related to the order–disorder phase transitions has been applied for the analysis of bandwidth of some modes below the 129 K phase transition (within the phase III). The results confirm the order–disorder type of this transition and give information about the energy barrier for a reorientation of the CH3ND3+ cations.
Słowa kluczowe
(CH3ND3)3Sb2Br9, Vibrational spectra, Phase transition
Adres publiczny
https://doi.org/10.1016/S0924-2031(00)00112-0
Strona internetowa wydawcy
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