Exploration of the structural, optical, and dielectric performance of Mg-doped Sr2FeNbO6 double perovskite for wireless applications

IF 4.7 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications Pub Date : 2025-06-11 DOI:10.1016/j.elecom.2025.107981

Asif Ullah , Farman Ullah , Kamran Ullah , Fida Rehman , Aiyeshah Alhodaib , Salhah Hamed Alrefaee , Shaxnoza Saydaxmetova , Salah Knani , Vineet Tirth , Ali Algahtani , Abid Zaman

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Abstract

This study examined the effects of Mg doping on the structural, optical, photoluminescence, and dielectric properties of a series of double perovskite Sr_2-xMgₓFeNbO₆ (0.00 ≤ x ≤ 0.40) ceramics that is successfully manufactured by using the mixed oxide route. It was proven by X-ray diffraction that a single-phase monoclinic perovskite (space group P21/c.) had formed, and at increasing Mg concentrations, SEM showed reduced porosity and increased grain uniformity. Tauc analysis and UV–Vis spectroscopy revealed a consistent decrease of the bandgap from 2.77 eV to 2.46 eV, which was ascribed to defect-induced electronic states and lattice distortion. The presence of levels of recombination-active defects was further confirmed by photoluminescence spectra. At high temperatures (∼560 °C), dielectric studies revealed a low loss (tanδ = 2.0) and a high dielectric constant (εᵣ ≈800), which made these materials attractive options for wireless communication components. Mg-doped Sr₂FeNbO₆ ceramics have the potential for advanced applications in microwave electronics and optoelectronics due to their superior dielectric behavior, bandgap tunability, and integrated structural stability.

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无线应用中掺镁Sr2FeNbO6双钙钛矿结构、光学和介电性能的探索

本研究考察了Mg掺杂对成功制备的双钙钛矿型Sr2-xMgₓFeNbO₆（0.00≤x≤0.40）陶瓷的结构、光学、光致发光和介电性能的影响。x射线衍射证实，形成了一种单相单斜钙钛矿（空间群P21/c.），随着Mg浓度的增加，SEM显示孔隙率降低，晶粒均匀性增加。Tauc分析和UV-Vis光谱显示，带隙从2.77 eV持续减小到2.46 eV，这是由于缺陷引起的电子态和晶格畸变所致。光致发光光谱进一步证实了重组活性缺陷水平的存在。在高温（~ 560°C）下，介电研究表明，这些材料具有低损耗（tanδ = 2.0）和高介电常数（εᵣ≈800），这使得这些材料成为无线通信元件的有吸引力的选择。镁掺杂Sr₂FeNbO₆陶瓷由于其优异的介电性能、带隙可调性和整体结构稳定性，在微波电子和光电子领域具有先进的应用潜力。

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来源期刊

Electrochemistry Communications 工程技术-电化学

CiteScore

8.50

自引率

3.70%

发文量

160

审稿时长

1.2 months

期刊介绍： Electrochemistry Communications is an open access journal providing fast dissemination of short communications, full communications and mini reviews covering the whole field of electrochemistry which merit urgent publication. Short communications are limited to a maximum of 20,000 characters (including spaces) while full communications and mini reviews are limited to 25,000 characters (including spaces). Supplementary information is permitted for full communications and mini reviews but not for short communications. We aim to be the fastest journal in electrochemistry for these types of papers.