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 me...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.展开更多
基金Maximilian Gehringer,An-Phuc Hoang,and Till Fromling gratefully acknowledge the German Ministry of Education and Research(BMBF)for funding of the Young Investigator Group HTLNBT within the program“NanoMatFutur”[Grant No.03XP0146]Sebastian Steiner and Till Fromling are thankful for the financial support by the Deutsche Forschungsgemeinschaft(DFG)through project Grant No.FR 3718/1-1.Bai-Xiang Xu would like to thank the DFG(Grant No.Xu 121/6e1)for the funding.
文摘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.
