Plastic crystal behaviour in tetraethylammonium dicyanamide
Annat, Gary, Adebahr, Josefina, McKinnon, Ian R., MacFarlane, Douglas R. and Forsyth, Maria 2007, Plastic crystal behaviour in tetraethylammonium dicyanamide, Solid state ionics, vol. 178, no. 15-18, pp. 1065-1071, doi: 10.1016/j.ssi.2007.04.015.
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Plastic crystal behaviour in tetraethylammonium dicyanamide
The 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.
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