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Naji, M. |
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Motta, Antonella |
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Aletan, Dirar |
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Mohamed, Tarek |
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Ertürk, Emre |
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Taccardi, Nicola |
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Kononenko, Denys |
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Petrov, R. H. | Madrid |
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Alshaaer, Mazen | Brussels |
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Bih, L. |
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Casati, R. |
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Muller, Hermance |
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Kočí, Jan | Prague |
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Šuljagić, Marija |
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Kalteremidou, Kalliopi-Artemi | Brussels |
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Azam, Siraj |
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Ospanova, Alyiya |
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Blanpain, Bart |
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Ali, M. A. |
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Popa, V. |
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Rančić, M. |
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Ollier, Nadège |
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Azevedo, Nuno Monteiro |
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Landes, Michael |
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Rignanese, Gian-Marco |
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Fojud, Zbigniew
Adam Mickiewicz University in Poznań
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (7/7 displayed)
- 2020Phase transitions, molecular dynamics and structural properties of 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquidcitations
- 2010Molecular dynamics in grafted polydimethylsiloxanescitations
- 2009Crystal structure, electric field gradient, and electronic charge densities in ReB<inf>2</inf>: A single crystal x-ray, B<sup>11</sup> nuclear magnetic resonance, and first-principles studycitations
- 2009The aluminium effect on the structure of silico-phosphate glasses studied by NMR and FTIRcitations
- 2008Redetermination of the structure and dielectric properties of bis(thiourea) pyridinium iodide - A new ferroelectric inclusion compoundcitations
- 2005Spectroscopic studies of poly(ε-caprolactone)/sodium montmorillonite nanocompositescitations
- 2005Structure of multicomponent SiO<inf>2</inf>-Al<inf>2</inf>O <inf>3</inf>-Fe<inf>2</inf>O<inf>3</inf>-CaO-MgO glasses for the preparation of fibrous insulating materialscitations
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article
Redetermination of the structure and dielectric properties of bis(thiourea) pyridinium iodide - A new ferroelectric inclusion compound
Abstract
<p>The crystal structure of bis(thiourea) pyridinium iodide (T2PyI) was previously determined at 295 and 110 K [Prout, Heyes, Dobson, McDaid, Maris, Mueller & Seaman (2000). Chem. Mater. 12, 3561-3569] and the two phases were described in the space groups Cmcm and P21 cn, respectively. Because differential scanning calorimetry revealed two phase transitions, at 161 and 141 K, a redetermination of the structure of T2pyI at 295, 155 and 110 K has been undertaken, and the following sequence of space groups obtained: Cmcm (I) C2cm (II) P21 cn (III). The high- (I) and low-temperature (III) phases confirmed the results reported in the previous study. In the new intermediate phase II, the mirror plane perpendicular to the x axis vanishes and the crystal structure loses the centre of symmetry. In phases I and II the pyridinium cations are strongly dynamically disordered, while in the low-temperature phase III the cations are well ordered. In all three phases the thiourea-iodine hydrogen-bonded sublattice is very well ordered. Dielectric measurements show that the intermediate and low-temperature phases are ferroelectric and that 161 K is the Curie point of a new ferroelectric crystal. © 2008 International Union of Crystallography.</p>