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Collet, E.
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article
Discovery of an intermediate phase in bis-thiourea pyridinium chloride inclusion compound
Abstract
<p>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 Cmc 2<sub>1</sub> → 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<sub>1</sub>=237 K is continuous while at T <sub>2</sub>=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. © 2009 American Institute of Physics.</p>