ABSTRACT A promising Aurivillius layered pervoskite ceramics, namely, the title compound has drawn interest in recent days owing to its figure of merit (magnetoelectric coupled properties). General formula of the compound is expressed as (Bi2O2)2+(A n–1 B nO3n+ 1)2–, where A represents Bi/Nd and B represents Ti/Fe/Co. However, no reports are available on impedance measurement of this compound. In the present study, four-layered (Bi4NdTi3Fe0. 7Co0.3O15) and three-layered (Bi3NdTi2Fe0. 7Co0. 3O12– ) compounds were synthesized by solid state reaction method and an intergrowth ceramics of three-layered and four-layered compound (title compound) was prepared. XRD pattern confirmed the intergrowth compound as single phase eight-layered compound. Dielectric data of the compounds were recorded as function of temperature at various frequencies. The intergrowth sample showed high dielectric and remnant polarization (Pr) values. From the combined impedance spectroscopic and AC conductivity (σac) plots, the respond function was found to be frequency dependent, indicating the conduction process to be thermally activated. In the present study, an attempt was made to understand the inheriting dielectric relaxations, and the results were corroborated to the master (scaling) plots. GRAPHICAL ABSTRACT

中文翻译：

---

Bi4NdTi3Fe0.7Co0.3O15-Bi3NdTi2Fe0.7Co0.3O12–δ共生Aurivilius陶瓷的电学研究

摘要 一种很有前途的 Aurivilius 层状钙钛矿陶瓷，即标题化合物，由于其品质因数（磁电耦合特性）在最近几天引起了人们的兴趣。该化合物的通式表示为(Bi2O2)2+(A n–1 B nO3n+ 1)2–，其中A代表Bi/Nd，B代表Ti/Fe/Co。但是，没有关于该化合物阻抗测量的报告。在本研究中，采用固态反应法合成了四层（Bi4NdTi3Fe0.7Co0.3O15）和三层（Bi3NdTi2Fe0.7Co0.3O12-）化合物以及三层和四层化合物的共生陶瓷（制备了标题化合物)。XRD 图证实共生化合物为单相八层化合物。化合物的介电数据被记录为不同频率下温度的函数。共生样品显示出高介电和残余极化 (Pr) 值。从组合阻抗谱和交流电导率 (σac) 图中，发现响应函数与频率有关，表明传导过程被热激活。在本研究中，试图了解继承的介电弛豫，结果得到了主（缩放）图的证实。图形概要 并且结果得到了主（缩放）图的证实。图形概要 并且结果得到了主（缩放）图的证实。图形概要