We have performed a dielectric investigation of the ionic charge transport and the relaxation dynamics in plastic crystalline 1-cyano-adamantane (CNA) and in two mixtures of CNA with the related plastic crystals adamantane or 2-adamantanon. Ionic charge carriers were provided by adding 1% of Li salt. The molecules of these compounds have nearly globular shape and, thus, the so-called revolving-door mechanism assumed to promote ionic charge transport via molecular reorientations in other PC electrolytes should not be active here. Indeed, a comparison of the dc resistivity and the reorientational α-relaxation times in the investigated PCs reveals complete decoupling of both dynamics. Similar to other PCs, we find a significant mixing-induced enhancement of the ionic conductivity. Finally, these solid-state electrolytes reveal a second relaxation process, slower than the α-relaxation, which is related to ionic hopping. Due to the mentioned decoupling, it can be unequivocally detected and is not superimposed by the reorientational contributions as found for most other ionic conductors.

中文翻译：

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具有近球形分子的塑料晶体中的离子电导率和弛豫动力学。

我们已对塑料晶体1-氰基金刚烷（CNA）以及CNA与相关塑料晶体金刚烷或2-金刚烷酮的两种混合物中的离子电荷传输和弛豫动力学进行了介电研究。通过添加1％的Li盐来提供离子载流子。这些化合物的分子几乎呈球形，因此，所谓的旋转门机制被认为可通过其他PC电解质中的分子重新取向促进离子电荷传输，因此在此不应起作用。确实，直流电阻率和方向性α的比较研究的PC中的松弛时间揭示了两种动力学的完全解耦。与其他PC相似，我们发现离子诱导的电导率显着增加。最后，这些固态电解质显示出第二弛豫过程，该过程比与离子跳跃有关的α-松弛慢。由于提到了去耦，因此可以毫不含糊地检测到它，而不会像大多数其他离子导体那样被重新定向的贡献所叠加。