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Thermal, dielectric and vibrational properties of allylammonium chloroantimonates(III) and chlorobismuthates(III): [C3H5NH3]3[BiCl6] and [C3H5NH3]3[SbCl5]·Cl.
Autorzy
Rok wydania
2012
Czasopismo
Numer woluminu
62
Strony
121-132
DOI
10.1016/j.vibspec.2012.05.015
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The allylammonium hexachlorobismuthate(III), [C3H5NH3]3[BiCl6], and the allylammonium pentachloroantimonate(III), [C3H5NH3]3[SbCl5]Cl, compounds have been synthesized and studied by means of differential scanning calorimetry, thermal expansion, dielectric and infrared (IR) techniques. [C3H5NH3]3[BiCl6] exhibits three solid–solid structural phase transitions (PTs) at: 304/304 K (I ↔ II) (upon cooling/heating), 195/197 K (II ↔ III) and 155/156 K (III ↔ IV). In turn [C3H5NH3]3[SbCl5]Cl exhibits two PTs at: 221/221 K (I ↔ II) and 181/185 K (II ↔ III). The dielectric studies have been made in the frequency range of 2 kHz–1 MHz between 100 and 350 K. The dielectric relaxation processes are observed in both crystals. The activation energy (EA) value of the dielectric relaxation process for [C3H5NH3]3[BiCl6] amounts to about 43 and 72 kJ mol−1 for the low- and high-temperature relaxation, respectively, whereas for [C3H5NH3]3[SbCl5]Cl EA = 15 kJ mol−1. The infrared spectra of [C3H5NH3]3[BiCl6] and [C3H5NH3]3[SbCl5]Cl have been recorded over the wavenumber range between 3800 and 40 cm−1 at selected temperatures (10–310 K). The mechanisms of PTs in the title compounds are discussed.
Słowa kluczowe
Thermal properties, Chloroantimonates(III) and chlorobismuthates(III), dielectric properties, phase transition, Infrared and Raman spectroscopy
Adres publiczny
https://doi.org/10.1016/j.vibspec.2012.05.015
Strona internetowa wydawcy
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