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Inne
Structural phase transitions in (n-C3H7NH3)2BiBr5 and (n-C3H7NH3)3BiBr6.
Autorzy
Rok wydania
1996
Czasopismo
Numer woluminu
217
Strony
67-77
DOI
10.1016/0921-4526(95)00537-4
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The (n-C3H7NH3)2BiBr5 crystal reveals a complex sequence of phase transitions (on cooling); 1st-order at 334, 235 and 170 K (probably continuous). The (n-C3H7NH3)3BiBr6 crystal undergoes a 1st-order phase transition at 281 K. Differential scanning calorimetry, linear thermal expansion and dielectric studies allow us to characterize these phase transitions in both crystals. Molecular motion in (n-C3H7NH3)2BiBr5 was studied by measuring the temperature dependencies of the proton spin-lattice relaxation time, T1, and the second moment M2. All phase transitions having an “order-disorder” nature are due to both the rotation of the alkyl chains of (n-C3H7NH3)+ cations and the C3 motion of NH3+ and CH3 groups.
Adres publiczny
https://doi.org/10.1016/0921-4526(95)00537-4
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