Faouzia Tayari, Silvia Soreto Teixeira, M. P. F. Graça, Manel Essid, Kais Iben Nassar
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引用次数: 0
Abstract
The goal of this research is to create a perovskite ceramic with electrical and dielectric properties appropriate for energy storage, medical uses, and electronic devices. A bismuth ferric titanate, Bi0.7Ba0.3(FeTi)0.5O3, doped with barium and crystalline, was effectively synthesized at the A-site via sol–gel synthesis. A rhombohedral structure emerged in the R3́C space group, which was confirmed by room-temperature X-ray studies. An average grain size of 263 nm and a homogeneous grain distribution and chemical composition were confirmed by the results of scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). The study established a clear relationship between temperature, frequency, and the electrical properties of the material. Impedance spectroscopy and electrical modulus measurements, performed in the frequency range of 1 kHz to 1 MHz and at temperatures ranging from 200 K to 360 K, demonstrated a non-Debye type of relaxation. Furthermore, once the material was produced at various temperatures, its frequency-dependent electrical conductivity was examined using Jonscher’s law. The results demonstrate that barium doping significantly improves the electrical conductivity and dielectric properties compared to pure BiFeTiO₃. Over the complete temperature range, consistent conduction and relaxation mechanisms were discovered. These findings suggest that the chemical may find widespread applicability across a broad temperature range, including electrical fields and capacitors.
这项研究的目标是创造出一种具有适合能量储存、医疗用途和电子设备的电气和介电特性的过氧化物陶瓷。通过溶胶-凝胶合成法,在 A 位有效合成了一种掺杂钡的结晶钛酸铁铋(Bi0.7Ba0.3(FeTi)0.5O3)。室温 X 射线研究证实,该化合物具有 R3́C 空间群的斜方体结构。扫描电子显微镜(SEM)和能量色散 X 射线分析(EDX)的结果证实了平均粒度为 263 nm、均匀的晶粒分布和化学成分。研究在温度、频率和材料的电特性之间建立了明确的关系。在 1 kHz 至 1 MHz 的频率范围和 200 K 至 360 K 的温度范围内进行的阻抗光谱和电模量测量显示了非德拜类型的弛豫。此外,在不同温度下生产出这种材料后,还利用容舍定律对其随频率变化的导电性进行了研究。结果表明,与纯 BiFeTiO₃ 相比,钡掺杂显著提高了导电性和介电特性。在整个温度范围内,发现了一致的传导和弛豫机制。这些研究结果表明,这种化学物质可能会在广泛的温度范围内得到广泛应用,包括电场和电容器。
期刊介绍:
The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.