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Plastic crystal behaviour in tetraethylammonium dicyanamide
journal contribution
posted on 2007-06-11, 00:00 authored by G Annat, J Adebahr, I McKinnon, D MacFarlane, Maria ForsythMaria ForsythThe plastic crystal tetraethylammonium dicyanamide ([N2,2,2,2][dca]) has been investigated with an emphasis on structure and dynamics in the plastic phase. It was found that almost all of the volume expansion occurs at the II → I transition, with no volume expansion at the melt transition (as normally observed for crystals). The conductivity of this material shows a rapid increase at temperatures below the II → I transition, reaching values ~ 10− 3 S/cm in Phase I, and 0.1 S/cm in the melt. The NMR measurements show that there is a sudden onset of rotational motions of the cations at the plastic transition; below this temperature the cations appear static. The rotational motion of the cation in Phase I has been discussed in terms of isotropic tumbling.
History
Journal
Solid state ionicsVolume
178Issue
15-18Pagination
1065 - 1071Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0167-2738eISSN
1872-7689Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2007, Elsevier B.V.Usage metrics
Keywords
plastic crystalvolumeNMRconductivityScience & TechnologyPhysical SciencesChemistry, PhysicalPhysics, Condensed MatterChemistryPhysicsDIFFERENTIAL THERMAL-ANALYSISPHASE-TRANSITIONSIONIC LIQUIDSELECTRICAL-CONDUCTIVITYMETHYLAMMONIUM IONSPYRAZOLIUM IMIDESHEAT-CAPACITIESTEMPERATUREELECTROLYTECondensed Matter Physics
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