Home > Publications database > Isostructural phase transition, quasielastic neutron scattering and magnetic resonance studies of a bistable dielectric ion-pair crystal [(CH3)2 NH2]2 KCr(CN)6 > print

001     863682
005     20210130002254.0
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100 1 _ |a Rok, M.
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245 _ _ |a Isostructural phase transition, quasielastic neutron scattering and magnetic resonance studies of a bistable dielectric ion-pair crystal [(CH3)2 NH2]2 KCr(CN)6
260 _ _ |a London
|c 2019
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520 _ _ |a We have synthesised and characterised a novel organic–inorganic hybrid crystal, [(CH3)2NH2]2KCr(CN)6. The thermal DSC, TMA, DTG and DTA analyses indicate two solid-to-solid structural phase transitions (PTs). According to the X-ray diffraction experiments, the first PT at 220 K is isostructural, since it does not involve a change of the space group. This transition occurs between the states, where the (CH3)2NH2+ cations are orientationally disordered and ordered (frozen). The other reversible PT at 481 K leads to a melt-like phase similar to the one observed in plastic crystals or polar liquids. Dielectric spectroscopy has been used to characterise the switching properties of the dipole moments in the vicinity of the PTs. Continuous-wave electron paramagnetic resonance spectroscopy was employed to investigate the effect of ordering on the local environment of the Cr3+ ions. We have also applied the quasielastic neutron scattering (QENS) technique as well as 1H NMR spectroscopy to measure the dynamics of the (CH3)2NH2+ cations residing in the inorganic framework.
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693 _ _ |a Forschungs-Neutronenquelle Heinz Maier-Leibnitz
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700 1 _ |a Bator, G.
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700 1 _ |a Zarychta, B.
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700 1 _ |a Dziuk, B.
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700 1 _ |a Repeć, J.
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700 1 _ |a Medycki, W.
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700 1 _ |a Šimėnas, M.
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700 1 _ |a Banys, J.
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773 _ _ |a 10.1039/C8DT05082A
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