Impedance spectroscopy has become one of the most versatile and essential investigation methods concerning electrical properties of materials for electronic and energy applications. Deriving knowledge about physical mechanisms, however, often demands excellent expertise in evaluating the spectra. Investigating different representations of the same data set can help elucidate the underlying physics, but this is rarely applied. In this work, the importance of using the modulus representation to identify parallel electric responses is rationalized. Those responses result from parallel conducting pathways, e.g., at grain boundaries, or from regions with differing permittivity, e.g., in composites. Qualitative and quantitative data can be obtained, as it is illustrated based on experimental data from electroceramics and respective physical simulation results using the finite element method. The findings should help to study intricate electric responses of materials with chemical or structural heterogeneity.

阻抗谱已成为有关电子和能源应用材料电性能的最通用和最重要的研究方法之一。然而，获取有关物理机制的知识通常需要在评估光谱方面具有出色的专业知识。研究同一数据集的不同表示可以帮助阐明基础物理，但这很少应用。在这项工作中，使用模数表示来识别并行电响应的重要性得到了合理化。这些响应来自平行传导路径，例如，在晶界处，或来自具有不同介电常数的区域，例如, 在复合材料中。可以获得定性和定量数据，如基于电陶瓷的实验数据和使用有限元方法的相应物理模拟结果所示。这些发现应该有助于研究具有化学或结构异质性的材料的复杂电响应。