$\mbox{Rb}_{2}\mbox{Ti}_2\mbox{O}_{5-δ}$：具有巨介电常数的超离子导体
$\mbox{Rb}_{2}\mbox{Ti}_2\mbox{O}_{5-δ}$: A superionic conductor with colossal dielectric constant
摘要：
导电性和高介电常数原则上是自排斥的，这使得术语绝缘体和电介质通常是同义的。当电载体是电子时，这当然是正确的，但不一定是在离子极其移动、电子传导可以忽略不计并且界面处的电荷转移不重要的材料中。在这里，我们证明了在钙钛矿衍生的结构含有五个协调的Ti原子，巨大的介电常数（高达$\mbox{10}^9$）连同非常高的离子传导$\mbox{10}^{-3}\mbox{S.cm}^{-1}$在室温下。I-V和介电常数行为的耦合调查允许证明，由于离子迁移和积累，这种材料的行为像一个巨大的偶极子，表现出巨大的电极化（$\mbox{0.1\,C.cm}^{-2}$的顺序）。因此，它可以被认为是一种“铁离子网”，在应用方面是非常有前途的。
英文摘要：
Electrical conductivity and high dielectric constant are in principle self-excluding, which makes the terms insulator and dielectric usually synonymous. This is certainly true when the electrical carriers are electrons, but not necessarily in a material where ions are extremely mobile, electronic conduction is negligible and the charge transfer at the interface is immaterial. Here we demonstrate in a perovskite-derived structure containing five-coordinated Ti atoms, a colossal dielectric constant (up to $\mbox{10}^9$) together with very high ionic conduction $\mbox{10}^{-3}\mbox{S.cm}^{-1}$ at room temperature. Coupled investigations of I-V and dielectric constant behavior allow to demonstrate that, due to ion migration and accumulation, this material behaves like a giant dipole, exhibiting colossal electrical polarization (of the order of $\mbox{0.1\,C.cm}^{-2}$). Therefore, it may be considered as a "ferro-ionet" and is extremely promising in terms of applications.
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