Abstract

In this study, different phases of iron oxide have been synthesized by sol–gel auto combustion route followed by annealing. Temperature and frequency-dependent dielectric properties have been studied in detail which provide the information on the contribution of grain and grain boundary in charge transport. Conductivity and electric modulus spectra have also been analyzed. The scaled coordination of impedance spectrum merges in a single master curve which signifies that the distribution of relaxation time is temperature independent. Complex impedance spectra have been used to evaluate activation energy (E_a) by using Arrhenius relation. The activation energy calculated for α-Fe₂O₃ is 1.36 eV.

摘要

在这项研究中，通过溶胶-凝胶自动燃烧路线和退火合成了不同相的氧化铁。已经详细研究了温度和频率相关的介电特性，这些特性提供了有关晶粒和晶界在电荷传输中的贡献的信息。还分析了电导率和电模量谱。阻抗谱的比例协调合并在一条主曲线中，这表明弛豫时间的分布与温度无关。通过使用阿伦尼乌斯关系，复阻抗谱已被用于评估活化能 ( E _a )。α-Fe ₂ O _{3 的}计算活化能为1.36 eV。