Abstract
Abstract An ionic plastic crystal (IPC) is defined as a phase of material in which the orientation orders of constituent ions are melted but the gravity centers are ordered. It is formed by near-globular ions, which are violently rotated or largely disordered. Because of the rotation or disorder, structural analysis of an IPC cannot be performed in the same routine fashion as that of an ordinary ordered crystal. Therefore, we formulated diffraction intensities of IPCs consisting of ions which are regarded as statistically spherical, by introducing the structure factor of the components with rotational disorder. The method was applied to the structural study of the IPC phase of trimethylethylammonium bis(fluorosulfonyl)amide ([N1112][FSA]), which is an ionic liquid prototype. As a result, we found that the [FSA]− and the [N1112]+ can be regarded as statistically spherical owing to independent rotation or large disorder around each N atom. In addition, they are arranged in the CsCl-type structure. This model explained well not only the diffraction pattern but also the intensities. This is probably the first report on the diffraction intensity analysis of IPC.
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