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- W2149257918 abstract "The plastic nature of the highest-temperature metastable phase of CH3NH3Br obtainable above 483 K was studied by X-ray diffraction, differential scanning calorimetry, and 1H NMR spin-lattice and spin-spin relaxation time measurements. The CsCl-type cubic structure determined for this phase implies the presence of highly disordered cationic orientations in accordance with the reported results in the other ionic-plastic crystals. 1H NMR relaxation times observed in this phase were well explained by the motional model of the slow translational self-diffusion and rapid overall rotation of the CH3NH3+ cations. The obtained activation energy (51 kJ mol−1) and correlation times (1.1 · 10−8 s at the melting point) were shown to be reasonable values as compared with those in stable plastic crystals. The melting condition derived from the dynamic parameters obtained in molecular and ionic plastic crystals was generally discussed." @default.
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- W2149257918 date "1991-12-01" @default.
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- W2149257918 title "Cationic Self-Diffusion in the Metastable Ionic-Plastic Phase of CH3NH3Br Studied by 1H NMR" @default.
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- W2149257918 doi "https://doi.org/10.1002/bbpc.19910951209" @default.
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