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Unusual combination of conduction and dielectric relaxations in nanocrystalline α-Fe2O3
Materials Letters ( IF 3 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.matlet.2020.127314
Muhammed Junais Pulikkathumbayil , G. Govindaraj

Abstract The present study elucidates the temperature and frequency-dependent electrical properties of α-Fe2O3 synthesised by co-precipitation method. XRD and Raman spectroscopy are employed to study the formation and crystal structure of the material. The material shows two relaxation peaks in the frequency range 1 Hz–1 MHz. The ac electrical data of the material are analysed with the novel relaxation function combining conduction and dielectric relaxations. The results reveal that the material possesses two types of dipoles, one corresponds to the free dipoles of FeO6 molecules, and the other corresponds to the pinned dipoles created by charge carriers and ion lattice. The dc conductivity, conduction relaxation time and dielectric relaxation time obey Arrhenius law.

中文翻译:

纳米晶 α-Fe2O3 中传导和介电弛豫的异常组合

摘要 本研究阐明了通过共沉淀法合成的 α-Fe2O3 的温度和频率依赖性电学特性。XRD和拉曼光谱用于研究材料的形成和晶体结构。该材料在 1 Hz–1 MHz 的频率范围内显示出两个弛豫峰。使用结合传导和介电弛豫的新型弛豫函数分析材料的交流电数据。结果表明,该材料具有两种类型的偶极子,一种对应于 FeO6 分子的自由偶极子,另一种对应于由电荷载流子和离子晶格产生的固定偶极子。直流电导率、传导弛豫时间和介电弛豫时间服从阿伦尼乌斯定律。
更新日期:2020-04-01
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