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Inne
Vibrational spectra of [(CH3) 3NH] 3Sb2Cl9, [(CH3) 3NH] 3Bi2Cl9 and their mixed crystals.
Autorzy
Rok wydania
1999
Czasopismo
Numer woluminu
20
Strony
103-111
DOI
10.1016/S0924-2031(99)00027-2
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The IR and Raman spectra of [(CH3)3NH]3Sb2Cl9 (A), [(CH3)3NH]3Bi2Cl9 (B) and two of their mixed crystals containing respectively 33% (AB.33) and 42% Bi (AB.42) are analyzed and compared. A and AB.33 show ferroelectric–paraelectric phase transition at 364 K and 344 K, respectively. AB.42 and B are paraelectric in the temperature range between 90 and 365 K. Most of the vibrational modes show continuous changes, with the temperature, in the IR frequencies or intensities with no soft mode behavior. However, characteristic ν(NH⋯Cl) and δ(NH⋯Cl) vibrations of weakly hydrogen-bonded species are only observed in A and AB.33 below the temperature of the phase transition and are related to the ferroelectricity. The evolution of the IR spectra with the temperature suggests that the ferroelectric properties are connected with the reorientation of the cations which needs a breaking of the weak NH⋯Cl hydrogen bonds in the paraelectric phase.
Słowa kluczowe
[(CH3)3NH]3Sb2Cl9, [(CH3)3NH]3Bi2Cl9, Mixed crystals
Adres publiczny
https://doi.org/10.1016/S0924-2031(99)00027-2
Strona internetowa wydawcy
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