Thermodynamic properties and molecular motions in ferroelectric (C3N2H5)5Sb2Br11

Kruk, Danuta; Medycki, W.; Przesławski, J.; Dacko, S.; Piecha, A.; Jakubas, R.

doi:10.1016/j.chemphys.2010.12.010

Cited by 7 publications

(2 citation statements)

References 26 publications

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“…The absence of “anomalies” in the relaxation times around the PT temperatures also indicates that the changes in the dynamics of the imidazolium cations are rather subtle. A similar behavior (absence of abrupt changes) of 1 H spin–lattice relaxation of imidazolium cations in the vicinity of ferroelectric transition was observed in some other haloantimonates(III) and halobismuthates(III). − …”

Section: Results and Discussionsupporting

confidence: 72%

Dynamics of Ferroelectric Bis(imidazolium) Pentachloroantimonate(III) by Means of Nuclear Magnetic Resonance ¹H Relaxometry and Dielectric Spectroscopy

et al. 2014

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Some of haloantimonates(III) and halobismuthates(III) are ferroelectric. Bis(imidazolium) pentachloroantimonate(III), (C3N2H5)2SbCl5 (abbreviation: ICA) is the first example of such compounds with a one-dimensional anionic chain which exhibits ferroelectric properties. The relation between the ionic dynamics and network structure and the ferroelectric features is not clear. Here Nuclear Magnetic Resonance (NMR) (1)H spin-lattice relaxation experiments at 25 MHz are reported for ICA in the temperature range of 80 K-360 K, covering ferroelectric-paraelectric and structural phase transitions of the compound occurring at 180 and 342 K, respectively. The relaxation process is biexponential in the whole temperature range indicating two dynamically nonequivalent types of imidazolium cations. Temperature dependences of both relaxation contributions allow for identifying three motional processes. Two of them are cation-specific - i.e. they are attributed to the two types of imidazolium cations, respectively. The third process involves both types of cations, and it is characterized by much lower activation energy. Moreover, the relaxation data (combined with (1)H second moment measurements) show that the ferroelectric-paraelectric phase transition mechanism is governed, to a large extent, by the anionic network arrangement. The NMR studies are complemented by dielectric spectroscopy experiments performed in the vicinity of the Curie temperature, TC = 180 K, to get insight into the mechanism of the ferroelectric-paraelectric phase transition. The dielectric dispersion data show critical slowing down of the macroscopic relaxation time, τ, in ICA when approaching TC from the paraelectric side, indicating an order-disorder type of ferroelectrics.

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Section: Results and Discussionsupporting

confidence: 72%

Dynamics of Ferroelectric Bis(imidazolium) Pentachloroantimonate(III) by Means of Nuclear Magnetic Resonance ¹H Relaxometry and Dielectric Spectroscopy

et al. 2014

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“…† The parameters are typical of heteroaromatic cations. [37][38][39][40][41][42][43][44][45] At the present stage we are not able to describe exactly the movements of the relaxing imidazolium cations in both the studied compounds in phase III. We may suppose that the different types of the small-angle librations of the imidazolium rings in-plane and out-of plane appear as it is postulated from X-ray diffraction.…”

Section: Optical Propertiesmentioning

confidence: 87%

Structure–property relationships in hybrid (C₃H₅N₂)₃[Sb₂I₉] and (C₃H₅N₂)₃[Bi₂I₉] isomorphs

Węcławik

Gągor

Jakubas

et al. 2016

Inorg. Chem. Front.

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NMR Studies of Solid-State Dynamics

Kruk

Privalov

Medycki

et al. 2012

Annual Reports on NMR Spectroscopy

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Thermodynamic properties and molecular motions in ferroelectric (C3N2H5)5Sb2Br11

Cited by 7 publications

References 26 publications

Dynamics of Ferroelectric Bis(imidazolium) Pentachloroantimonate(III) by Means of Nuclear Magnetic Resonance ¹H Relaxometry and Dielectric Spectroscopy

Dynamics of Ferroelectric Bis(imidazolium) Pentachloroantimonate(III) by Means of Nuclear Magnetic Resonance ¹H Relaxometry and Dielectric Spectroscopy

Structure–property relationships in hybrid (C₃H₅N₂)₃[Sb₂I₉] and (C₃H₅N₂)₃[Bi₂I₉] isomorphs

NMR Studies of Solid-State Dynamics

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Thermodynamic properties and molecular motions in ferroelectric (C3N2H5)5Sb2Br11

Cited by 7 publications

References 26 publications

Dynamics of Ferroelectric Bis(imidazolium) Pentachloroantimonate(III) by Means of Nuclear Magnetic Resonance 1H Relaxometry and Dielectric Spectroscopy

Dynamics of Ferroelectric Bis(imidazolium) Pentachloroantimonate(III) by Means of Nuclear Magnetic Resonance 1H Relaxometry and Dielectric Spectroscopy

Structure–property relationships in hybrid (C3H5N2)3[Sb2I9] and (C3H5N2)3[Bi2I9] isomorphs

NMR Studies of Solid-State Dynamics

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Dynamics of Ferroelectric Bis(imidazolium) Pentachloroantimonate(III) by Means of Nuclear Magnetic Resonance ¹H Relaxometry and Dielectric Spectroscopy

Dynamics of Ferroelectric Bis(imidazolium) Pentachloroantimonate(III) by Means of Nuclear Magnetic Resonance ¹H Relaxometry and Dielectric Spectroscopy

Structure–property relationships in hybrid (C₃H₅N₂)₃[Sb₂I₉] and (C₃H₅N₂)₃[Bi₂I₉] isomorphs