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Inne
Specific heat and linear birefringence behaviour of 4-aminopyridinium tetrachloroantimonate (III), [4-NH2C5H4NH][SbCl4].
Autorzy
Rok wydania
2003
Czasopismo
Journal of Physics-Condensed Matter
Numer woluminu
15
Strony
643-648
DOI
10.1088/0953-8984/15/43/L01
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Thermal (specific heat) and optical (linear birefringence) studies were performed for a new ferroelectric crystal [4-NH2C5H4NH][SbCl4]. Four phase transitions were confirmed and described. Thermal parameters (ΔH,ΔS) of the normal–incommensurate, N–IC, and incommensurate–ferroelectric commensurate, IC–F(C), phase transitions are given. The order–disorder mechanism of the N–IC phase transition is proved but the displacive one for the IC–F(C) transition can be proposed. The critical index value (2β = 0.68 ± 0.02) estimated from the linear birefringence measurements indicates that the N–IC phase transition can be described in terms of the 3d XY model.
Adres publiczny
https://doi.org/10.1088/0953-8984/15/43/L01
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