The electrical properties of cubic perovskite series, CaCu_3–x Ti_4–x Fe_2x O₁₂ with x = 0.0, 0.1, 0.3, 0.5, and 0.7, have been studied by employing current density as a function of electric field characteristics registered at different temperatures and thermal variations of direct current electrical resistivity measurements. All of the compositions exhibit strong non-ohmic behavior. The concentration dependence of breakdown field, the temperature at which switching action takes place, and maximum value of current density (J _max) has been explained on account of structural, microstructural, and positron lifetime parameters. The highest ever reported value of J _max = 327 mA/cm² has been observed for pristine composition. The values of the nonlinear coefficient advise the suitability of ceramics for low-voltage varistor applications. The Arrhenius plots show typical semiconducting nature. The activation energy values indicate that electric conduction proceeds through electrons with deformation in the system.

中文翻译：

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Fe3+取代对四重钙钛矿CaCu3Ti4O12 J-E特性和直流电阻率热变化的影响

_{立方钙钛矿系CaCu 3–}的电学性质_X 钛_4–X 铁_2X O ₁₂与X= 0.0、0.1、0.3、0.5 和 0.7，已通过使用电流密度作为在不同温度下记录的电场特性和直流电阻率测量的热变化的函数来研究。所有组合物都表现出强烈的非欧姆行为。击穿场的浓度依赖性，发生开关动作的温度以及电流密度的最大值（杰 _max ) 已根据结构、微观结构和正电子寿命参数进行了解释。有史以来最高的报告价值杰 对于原始成分，已观察到_最大值= 327 mA/cm ^{2 。}非线性系数的值表明陶瓷对低压变阻器应用的适用性。Arrhenius 图显示典型的半导体性质。活化能值表明导电通过电子进行，并在系统中发生变形。