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Abstract：
Silver iodide is a prototype compound of superionic conductors that allows ions to flow through its structure. It exhibits a first-order phase transition at 420 K, characterized by an abrupt change in its ionic conductivity behavior, and above this temperature, its ionic conductivity increases by more than three orders of magnitude. Introducing small concentrations of carbon into the silver iodide structure produces a new material with a mixed conductivity (ionic and electronic) that increases with increasing temperature. In this work, we report the experimental results of the ionic conductivity as a function of the reciprocal temperature for the (AgI)x - C(1-x) mixture at low carbon concentrations (x = 0.99, 0.98, and 0.97). The ionic conductivity behavior as a function of reciprocal temperature was well fitted using a phenomenological model based on a random variable theory with a probability distribution function for the carriers. The experimental data show a proximity effect between the C and AgI phases. As a consequence of this proximity behavior, carbon concentration or temperature can control the conductivity of the (AgI)x - C(1-x) mixture.
摘要：
碘化银是超离子导体的原型化合物,其允许离子流过其结构。在420K时表现出一阶相变，其特征在于其离子电导率行为的突然变化，高于这个温度，它的离子电导率增加了三个数量级以上。在碘化银结构中引入低浓度的碳可产生一种新材料，该材料具有混合的电导率（离子和电子），该电导率随温度升高而增加。在这项工作中,我们报告了在低碳浓度（x=0.99，0.98和0.97）下（AgI）x-C（1-x）混合物的离子电导率随温度倒数变化的实验结果。使用基于随机变量理论的现象学模型以及载流子的概率分布函数，可以很好地拟合作为倒数温度函数的离子电导率行为。实验数据显示了C和AgI相之间的邻近效应。作为这种接近行为的结果，碳浓度或温度可以控制(AgI)x-C(1-x)混合物的电导率。
