Discovery of an intermediate phase in bis-thiourea pyridinium chloride inclusion compound. - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Journal of Chemical Physics Année : 2009

Discovery of an intermediate phase in bis-thiourea pyridinium chloride inclusion compound.

Aleksandra Pajzderska
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Jan Wąsicki
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Loic Toupet
Eric Collet

Résumé

This paper reports the occurrence of a new phase for bis-thiourea pyridinium chloride inclusion compound, which is intermediate to the high- and low-temperature ones already reported. The structure of the intermediate phase was determined by the x-ray diffraction and the following sequence of space groups was obtained: Cmcm-->(237 K)Cmc2(1)-->(206 K)Pbca. The triplication of the lattice a parameter in the intermediate phase was observed. Detailed investigations of its phase transitions were performed by differential scanning calorimetry, x-ray diffraction, and dielectric spectroscopy methods. The phase transition at T(1)=237 K is continuous while at T(2)=206 K is discontinuous. Both phase transitions have been classified as of order-disorder type. The high- and low-temperature phases are nonpolar in contrast to the intermediate phase, for which we could not found ferroelectric ordering.
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Dates et versions

hal-00666908 , version 1 (06-02-2012)

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Aleksandra Pajzderska, Jan Wąsicki, Piotr Czarnecki, Loic Toupet, Eric Collet. Discovery of an intermediate phase in bis-thiourea pyridinium chloride inclusion compound.. Journal of Chemical Physics, 2009, 130 (4), pp.044503. ⟨10.1063/1.3065983⟩. ⟨hal-00666908⟩
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