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The para-ferroelectric phase transitions in (NH3(CH3)5Bi2Cl11. (P.M.A.C.B.).
Autorzy
Rok wydania
1991
Czasopismo
Numer woluminu
33
Strony
31-41
DOI
10.1080/01411599108207709
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
A new ferroelectric crystal, (CH3NH3)5 Bi2Cl11 has been grown. It reveals a second-order phase transition at 307 K with a high peak in the dielectric permittivity along c: ∊c ⋍ 8.5 × 103. The structures of the ferro and paraelectric phases are orthorhombic. In the paraelectric phase, three of the five methylammoniums are disordered, while in the ferroelectric phase two of them are still disordered. The packing is ensured by N—H…Cl hydrogen bonds between anions and cations. The ordering of the methylammonium cation in the ferroelectric phase leads to a new hydrogen bond formation responsible for the high dipolar properties of this compound.
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