The electric conductivity and dielectric properties of polycrystalline La_0.53Ca_0.47Mn_0.5Cr_0.5O₃ are studied with impedance spectroscopy techniques over a wide range of frequencies and temperatures from 100 to 1 MHz and 100 and to 400 K, respectively. The material exhibits a semiconductor behavior in the whole temperature range, characterized by a change in the slope at a specific temperature with a saturation at ~ 360 K. At low temperature, the conduction mechanism is governed by distributed trap localized charge carrier states described by a variable-range hopping model. At high temperature, the conduction mechanism is thermally activated by a small polaron hopping process. At low frequencies, the high dielectric constants of the material decrease rapidly with frequency and increase with temperature due to the free charges accumulated at the electrode-sample interface (interfacial Maxwell–Wagner polarization). These high dielectric constants can be interpreted by the existence of grain boundaries. Additionally, the Nyquist plots are presented by two depressed not centered semicircles on the real axis, indicating non-Debye behavior for the material. The resistance of the grain boundaries is larger than the resistance of the grains, confirming that the grain boundaries govern the conductivity in La_0.53Ca_0.47Mn_0.5Cr_0.5O₃. Finally, the modulus analysis indicates a transition of carrier mobility from the long range in the low-frequency region to the short range in the high-frequency region.

多晶La _0.53 Ca _0.47 Mn _0.5 Cr _0.5 O _3的电导率和介电性能分别使用阻抗谱技术在100至1 MHz和100至400 K的频率和温度范围内进行研究。该材料在整个温度范围内均表现出半导体特性，其特征在于特定温度下的斜率发生变化，饱和度约为〜360K。在低温下，导电机制受分布陷阱局部电荷载流子状态的支配，如可变范围跳变模型。在高温下，传导机制通过小的极化子跳跃过程被热激活。在低频下，由于电极-样品界面上累积的自由电荷（Maxwell-Wagner极化界面），材料的高介电常数随频率而迅速降低，并随温度而升高。这些高介电常数可以通过晶界的存在来解释。此外，奈奎斯特图由实轴上的两个下陷但不居中的半圆表示，表明材料的非德拜行为。晶界的电阻大于晶粒的电阻，这证实了晶界控制着La中的电导率_0.53 Ca _0.47 Mn _0.5 Cr _0.5 O ₃。最后，模量分析表明载流子迁移率从低频区域的长范围到高频区域的短范围过渡。