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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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Szafrański, Marek
Adam Mickiewicz University in Poznań
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (23/23 displayed)
- 2024Structural and optical properties of methylhydrazinium lead bromide perovskites under pressurecitations
- 2024Polyiodides of amino acids. Betainium triiodidecitations
- 2023Electrical polarization switching in bulk single-crystal GaFeO$_3$
- 2022Above-room-temperature ferroelectricity and piezoelectric activity of dimethylglycinium-dimethylglycine chloridecitations
- 2019Vitrification and New Phases in the Water:Pyrimidine Binary Eutectic Systemcitations
- 2019Band Gap Engineering in MASnBr3and CsSnBr3 Perovskites: Mechanistic Insights through the Application of Pressurecitations
- 2018A giant 2-dimensional dielectric response in a compressed hydrogen-bonded hybrid organic-inorganic saltcitations
- 2016Mechanism of Pressure-Induced Phase Transitions, Amorphization, and Absorption-Edge Shift in Photovoltaic Methylammonium Lead Iodidecitations
- 2014Effect of high pressure on the supramolecular structures of guanidinium based ferroelectricscitations
- 2014Quasistatic disorder of NH⋯N bonds and elastic-properties relationship in 2-phenylimidazole crystalscitations
- 2014Origin of metastable properties in the ferroelectric phase of tetraguanidinium dichloro-sulfatecitations
- 2013Strong negative thermal expansion and relaxor ferroelectricity driven by supramolecular patternscitations
- 2011Crystal structures, phase transitions, and pressure-induced ferroelectricity in [C(NH<inf>2</inf>)<inf>3</inf>]<inf>5</inf>SO <inf>4</inf>(SO<inf>3</inf>-OC<inf>2</inf>H<inf>5</inf>)<inf>2</inf>Fcitations
- 2008Anomalous protonic-glass evolution from ordered phase in NH...N hydrogen-bonded dabcoHBF ferroelectriccitations
- 2007Impossibility of pressure-induced crossover from ferroelectric to nonergodic relaxor state in a Pb (Mg1 3 Nb2 3) 0.7 Ti0.3 O3 crystal: Dielectric spectroscopic studycitations
- 2007Crystal structure and phase transitions in perovskite-like C(NH<inf>2</inf>)<inf>3</inf>SnCl<inf>3</inf>citations
- 2006Molecular interactions in crystalline dibromomethane and diiodomethane, and the stabilities of their high-pressure and low-temperature phasescitations
- 2006Disproportionation of pyrazine in NH<sup>+</sup>⋯ hydrogen-bonded complexes: New materials of exceptional dielectric responsecitations
- 2005Structural implications of anomalous thermal expansion and glass-like dielectric response in pyridinium halogenoauratescitations
- 2004High-pressure peculiarities in compositionally ordered Pb(Sc <inf>1/2</inf>Nb<inf>1/2</inf>)O<inf>3</inf>citations
- 2002Dielectric and structural properties of dipyridinium iodide triiodidecitations
- 2001Microscopic instabilities related to H<inf>3</inf>O<sup>+</sup> dynamics in monoguanidinium dioxonium trinitratecitations
- 2000Pressure-induced decoupling of the order-disorder and displacive contributions to the phase transition in diguanidinium tetrachlorostannatecitations
Places of action
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article
Crystal structures, phase transitions, and pressure-induced ferroelectricity in [C(NH<inf>2</inf>)<inf>3</inf>]<inf>5</inf>SO <inf>4</inf>(SO<inf>3</inf>-OC<inf>2</inf>H<inf>5</inf>)<inf>2</inf>F
Abstract
<p>A guanidinium compound, [C(NH<sub>2</sub>)<sub>3</sub>]<sub>5</sub>SO <sub>4</sub>(SO<sub>3</sub>-OC<sub>2</sub>H<sub>5</sub>)<sub>2</sub>F, with complex anionic sublattice has been synthesized and characterized by calorimetric and dielectric measurements at ambient and high hydrostatic pressures, as well as by single-crystal X-ray diffraction at varied temperatures. At room temperature, the crystal structure is orthorhombic, with the space group Pnma. In this phase, each of the two crystallographically nonequivalent ethoxysulfonate anions is disordered between two sites. On cooling, one of these anions starts to set in order at 228 K, where the crystal transforms in a continuous manner to the intermediate orthorhombic phase, with the space group P2<sub>1</sub>2<sub>1</sub>2<sub>1</sub>. This transition belongs to the exceptionally rare pure gyrotropic phase transitions, the order parameter of which is described by the third-rank gyrotropic tensor. The ordering of the second ethoxysulfonate anion occurs suddenly at 187 K, inducing a first-order phase transition to the low-temperature phase of space group Pna2<sub>1</sub>. The dissimilar response of both ethoxysulfonate anions to the temperature variation can be attributed to the different hydrogen bonding patterns they form with the cationic framework. Despite the polar symmetry, the low-temperature phase is not ferroelectric at ambient pressure, but it acquires ferroelectric features at elevated pressures above 140 MPa, as evidenced by the polarization reversal in an external electric field. The ferroelectric properties disappear on increasing pressure above 220 MPa, where the phase transition strongly modifying the crystal properties, but fully reversible, takes place. In the pressure-induced phase, a Debye-like dipolar relaxation process has been found and characterized as a function of pressure. The unusual properties of [C(NH<sub>2</sub>)<sub>3</sub>]<sub>5</sub>SO<sub>4</sub>(SO <sub>3</sub>-OC<sub>2</sub>H<sub>5</sub>)<sub>2</sub>F under hydrostatic pressure have been summarized in the p-T phase diagram. © 2011 American Chemical Society.</p>