Discovery of an intermediate phase in bis-thiourea pyridinium chloride inclusion compound.
In: Journal of Chemical Physics, Jg. 130 (2009-01-28), Heft 4, S. N.PAG- (6S.)
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Zugriff:
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 KCmc21→206 KPbca. 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 T1=237 K is continuous while at T2=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. [ABSTRACT FROM AUTHOR]
Titel: |
Discovery of an intermediate phase in bis-thiourea pyridinium chloride inclusion compound.
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Autor/in / Beteiligte Person: | Pajzderska, A. ; Polish_hook, J. ; Czarnecki, P. ; Toupet, L. ; Collet, E. |
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Zeitschrift: | Journal of Chemical Physics, Jg. 130 (2009-01-28), Heft 4, S. N.PAG- (6S.) |
Veröffentlichung: | 2009 |
Medientyp: | academicJournal |
ISSN: | 0021-9606 (print) |
DOI: | 10.1063/1.3065983 |
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