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首页> 外文期刊>Condensed Matter >Complex Dielectric and Impedance Spectroscopic Studies in a Multiferroic Composite of Bi2Fe4O9-BiFeO3
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Complex Dielectric and Impedance Spectroscopic Studies in a Multiferroic Composite of Bi2Fe4O9-BiFeO3

机译：Bi2Fe4O9-BiFeO3的多铁复合材料的复介电和阻抗谱研究

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摘要

Complex dielectric and impedance spectroscopic studies have been carried out in a detailed manner on the system comprising of Bi2Fe4O9-BiFeO3 composite particles dispersed in a α-Fe2O3 matrix as prepared using ball milling and controlled annealing treatments. This multiferroic composite is observed to exhibit a giant dielectric constant associated with a low tangent loss. A non-Debye type of relaxation has been deduced based on complex modulus analysis. Based on these studies, the important role played by bismuth ferrite nanoshell in the core-shell composite of Bi2Fe4O9-BiFeO3 is elucidated for the observed complex impedance spectroscopic properties of the system. Electron hopping across Fe2+/Fe3+ and oxygen vacancies are deduced to be playing an important role in conduction mechanisms based on activation energy analysis of the complex impedance spectroscopy results.
机译：已经对系统进行了详细的介电和阻抗光谱的复杂研究，该系统包括分散在α-Fe2O3基质中的Bi2Fe4O9-BiFeO3复合颗粒，该颗粒是通过球磨和受控退火处理制备的。观察到这种多铁性复合材料表现出与低切线损耗相关的巨大介电常数。基于复数模量分析已推导出了非德拜型松弛。基于这些研究，阐明了铋铁氧体纳米壳在Bi2Fe4O9-BiFeO3的核-壳复合物中的重要作用，因为该系统具有复杂的阻抗谱特性。基于复数阻抗谱结果的活化能分析，推断出跨越Fe2 + / Fe3 +的电子跃迁和氧空位在传导机理中起着重要作用。

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