| People | Locations | Statistics |
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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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Czarnecki, Piotr
Adam Mickiewicz University in Poznań
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (18/18 displayed)
- 2022Above-room-temperature ferroelectricity and piezoelectric activity of dimethylglycinium-dimethylglycine chloridecitations
- 2012New ferroelectric: Bis-thiourea pyridinium bromide inclusion compoundcitations
- 2012Structures and phase transitions in a new ferroelectric-pyridinium chlorochromate-studied by X-ray diffraction, DSC and dielectric methodscitations
- 2010The neutron diffraction study, calorimetry and spontaneous polarization of pyridinium perrhenate at 350, 300 and 100Kcitations
- 2009Discovery of an intermediate phase in bis-thiourea pyridinium chloride inclusion compound.citations
- 2009Discovery of an intermediate phase in bis-thiourea pyridinium chloride inclusion compoundcitations
- 2008Redetermination of the structure and dielectric properties of bis(thiourea) pyridinium iodide - A new ferroelectric inclusion compoundcitations
- 2007Phase transitions in ferroelectric pyridinium periodide under high pressurecitations
- 2006Structure, phase transitions and dielectric properties of a new inclusion compound of bis-thiourea pyridinium nitrate saltcitations
- 2006Dielectric response of the relaxor ferroelectric Pb(Mg<inf>1/3</inf>Nb <inf>2/3</inf>)O<inf>3</inf> in the nonergodic state after a DC electric field is turned off
- 2005Decoupling of the order-disorder and displacive contributions to the phase transition in NH<inf>4</inf>H(ClH<inf>2</inf>CCOO)<inf>2</inf>citations
- 2005Compositional and pressure effects on the phase transition in ferroelectric NH<inf>4</inf>H(ClH<inf>2</inf>CCOO)<inf>2</inf>
- 2003Effect of hydrostatic pressure on the dielectric response of Pb(Mg 1/3Nb2/3)O3 relaxorcitations
- 2003The neutron diffraction study of pyridinium periodate at 352, 300 and 100 Kcitations
- 20012-5 pyrochlore relaxor ferroelectric Cd<inf>2</inf>Nb<inf>2</inf>O<inf>7</inf> and its Fe<sup>2+</sup>/Fe<sup>3+</sup> modificationscitations
- 2001Structure and dynamics of ferroelectric pyridinium periodatecitations
- 2000High pressure study of cation dynamics in pyridinium Perchloratecitations
- 2000Structure and dielectric properties of ferroelectric pyridinium perrhenate crystalscitations
Places of action
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article
The neutron diffraction study of pyridinium periodate at 352, 300 and 100 K
Abstract
<p>The crystal and molecular structure of pyridinium periodate [H<sub>5</sub>C<sub>5</sub>NH]<sup>+</sup>[IO<sub>4</sub>]<sup>-</sup> (hereafter referred to as PyIO<sub>4</sub>) was re-determined by single-crystal neutron diffraction at 350, 300 and 100 K. The structures of the high-temperature paraelectric and the ferroelectric intermediate phase confirmed the x-ray results. The low-temperature ferroelectric phase at 100 K, for which x-ray results did not agree with dielectric measurements, was uniquely determined by neutron diffraction. The sequence of space groups and continuous phase transitions is Cmcm(I) 321 K → Cmc2<sub>1</sub>(II) 210 K → C112<sub>1</sub>(III). The structure of the low-temperature phase III is consistent with all physical measurements. The continuous phase transition at T<sub>2</sub> = 210 K is not just accompanied by symmetry lowering but also by reversible twinning by pseudo-merohedry. The dipole moment of the ions of the low ferroelectric phase was calculated using the Gaussian 98 program. The theoretical value agrees well with the experimental spontaneous polarization measurements from the pyroelectric effect. The PyIO<sub>4</sub> belongs to the order-disorder class of ferroelectrics.</p>