标题： 硝酸锂中的巨大介电响应和电极化 显示英文标题

标题： Colossal Dielectric Response and Electric Polarization in Lithium Nitrate

摘要： 硝酸锂 LiNO$_3$被确认在粉末样品中，在临界温度$T$$_W$ = 306 K 以上时，在 1 千赫兹下的介电常数$\epsilon$' 大于 6x10$^6$。对于单晶样品，在经过简单的“活化”过程后，在 280-340 K 温度范围内，$\epsilon$' 可以保持高于 10$^5$，且损耗因子低于 10。 此外，热释电电流测量表明LiNO$_3$具有铁电性，其电极化强度为$P$= 1,200$\mu$C/cm$^2$。 两者$\epsilon$和$P$都是已知材料中最高的之一。 我们提出一个模型，说明$\epsilon$' 和$P$的巨大幅度可能源于宏观层面上平面 NO$_3$$^-$ 的齿轮啮合与脱离过程。 我们的结果有可能推动陶瓷电容器的边界。 显示英文摘要

摘要： Lithium nitrate LiNO$_3$ is identified to possess a dielectric constant $\epsilon$' larger than 6x10$^6$ at 1 kHz in powder samples above the critical temperature $T$$_W$ = 306 K. For single crystalline samples, $\epsilon$' can be sustained to remain above 10$^5$ and the dissipation factor below 10 in the temperature region of 280-340 K after a simple 'activation' process. Moreover, pyroelectric current measurements show LiNO$_3$ to be ferroelectric with an electric polarization of $P$ = 1,200 $\mu$C/cm$^2$. Both $\epsilon$' and $P$ are amongst one of the highest in all known materials. We propose a model suggesting the mechanism underlying the colossal magnitudes of $\epsilon$' and $P$ to stem from a gearing-ungearing process of the planar NO$_3$$^-$ at the macroscopic level. Our results potentially push the boundaries of ceramic capacitors.