In this work, we discuss the synthesis, characterization and dielectric properties of Bi0.9La0.1−x(Ba/Sr)xFeO₃ [x = 0, 0.05] ceramic compounds. These samples were synthesized via a solid-state reaction method and then characterized for structural analysis exploiting the X-ray diffraction (XRD) technique. The Rietveld refinement data inferred that all the prepared samples were acquired a monoclinic phase with space group C1c1. Field emission scanning electron micrographs (FE-SEM) images of the samples indicated highly grown grains with a moderate level of grain boundary development across the sample. The energy dispersive analysis of the X-ray (EDAX) diffraction spectra analysis confirmed that the composition was free from foreign impurities. Further, UV–Vis experiment was conducted and estimated average value of optical bandgap was about 2.2 eV, which is highly recommended for photocatalytic and opto-electronic device applications. Room-temperature dielectric studies revealed that samples were extremely good dielectric materials with low dielectric loss, which is important for storage device applications. In addition, the depressed semicircles obtained from impedance analysis indicated that the samples exhibited distributed relaxation times and non-Debye behavior.

中文翻译：

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钡 (Ba2+) 和锶 (Sr2+) 掺杂 Bi0.9La0.1FeO3 陶瓷的结构、光学和电学性能研究

在这项工作中，我们讨论了 Bi 的合成、表征和介电特性0.9拉0.1-X(巴/锶)X_三氧化二铁[X = 0, 0.05] 陶瓷化合物。这些样品通过固态反应法合成，然后利用 X 射线衍射 (XRD) 技术进行结构分析表征。Rietveld 精修数据推断所有制备的样品均获得具有空间群 C1c1 的单斜晶相。样品的场发射扫描电子显微照片 (FE-SEM) 图像表明高度生长的晶粒在整个样品中具有中等程度的晶界发展。X射线(EDAX)衍射光谱分析的能量色散分析证实该组合物不含外来杂质。此外，进行了 UV-Vis 实验，估计光学带隙的平均值约为 2.2 eV，强烈推荐用于光催化和光电器件应用。室温介电研究表明，样品是极好的介电材料，具有低介电损耗，这对于存储设备应用很重要。此外，阻抗分析得到的凹陷半圆表明样品表现出分布的弛豫时间和非德拜行为。