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Inne
Structural phase transitions in (n-C3H7NH3)2SbBr5.
Autorzy
Rok wydania
1993
Czasopismo
Zeitschrift für Naturforschung Section A: A Journal of Physical Sciences
Numer woluminu
48A
Strony
529-534
DOI
10.1515/zna-1993-0314
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Dielectric, DSC, thermal expansion and preliminary X-ray diffraction studies on (n-C3H7NH3)- SbBr5 are reported. It was found that this crystal undergoes a complex sequence of phase transitions. On cooling: phase I → phase II at 188.7 K (continuous), II → III at 165 K (1st order, ΔS = 26.8 J/mol K), III → IV at 137 K (1st order, 1.6 J/mol K). On heating: IV → III at 154 K, III → II’ at 168 K, II’ → II at 177 K (1st order, 2.8 J/mol K), II → I at 189 K. All 1st order phase transitions are likely due to the motion of the n-C3H7NH3+cations. The dielectric dispersion studies between 100 Hz-1 MHz within the phases I and II indicate a fast reorientational motion of dipoles with τ < 10−7 S.
Słowa kluczowe
Alkylammonium halogenoantimonates, Phase transition, Dielectric, DSC, Thermal expansion
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