Abstract Compositions with x=0.03, 0.05 and 0.10 are synthesized in the syst em BaFexTi1–xO3 using conventional solid state reaction method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). XRD patterns reveal the coexistence of tetragonal and hexagonal phases which are strongly affected by the level of Fe doping. The hexagonal phase increases with increasing x, being maximum for x=0.10. SEM images show the presence of agglomerated grains which increase in size with amount of Fe doping. SEM for x=0.10 shows mostly rod-like or rectangular grains indicating predominantly hexagonal phase. Dielectric and impedance measurements have been carried out in the frequency range 20 Hz-1 MHz as a function of temperature (300-650 K). The samples with x=0.03 and 0.05 exhibit diffuse phase transition. Using complex impedance analysis equivalent circuit models have been developed which represent the data well and successfully separate out the contributions of tetragonal phase, hexagonal phase, grain boundaries and electrodes. GRAPHICAL ABSTRACT

中文翻译：

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Fe 掺杂 BaTiO3 的结构、介电和阻抗光谱研究

摘要 在 BaFexTi1-xO3 系统中，使用常规固态反应方法合成了 x=0.03、0.05 和 0.10 的组合物，并通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和能量色散 X 射线光谱仪进行表征。 EDX）。XRD 图案揭示了四方相和六方相的共存，这些相受到 Fe 掺杂水平的强烈影响。六方相随着 x 的增加而增加，x=0.10 时最大。SEM 图像显示存在附聚晶粒，其尺寸随着 Fe 掺杂量的增加而增加。x=0.10 的 SEM 显示主要是棒状或矩形晶粒，表明主要是六方相。介电和阻抗测量已在 20 Hz-1 MHz 的频率范围内作为温度 (300-650 K) 的函数进行。x=0.03 和 0 的样本。05 表现出扩散相变。已经开发了使用复阻抗分析等效电路模型，该模型可以很好地表示数据并成功地分离出四方相、六方相、晶界和电极的贡献。图形概要