Synergistic effects of Al and Co co-doping on structural, electrical and luminescence properties of gallium ferrites synthesized by sol-gel method

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology Pub Date : 2024-08-05 DOI:10.1007/s10971-024-06498-3

Pritam Das, Nandni Sharma, Kulwinder Singh, Sur Sharma Kongbrailatpam, Sawini, Mukul Kumar, Sanjeev Kumar, Ashish Kumar Mall, Deepak Kumar, Suresh Ghotekar

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Abstract

In the present manuscript, synergic impacts of aluminum and cobalt co-doping on the structural, optical, P-E and leakage current densities of gallium ferrite (GFO) have been investigated. We have synthesized polycrystalline Ga_1-xAl_xFeO₃ (x = 0.0, 0.50) and Ga_0.5Al_0.5Fe_1-yCo_yO₃ (y = 0, 0.025, 0.05) samples using the sol-gel method. XRD analysis shows the orthorhombic crystal structure corresponding to the Pc21n space group with no secondary or impurity peaks. The unit cell volume decreases with Al and Co co-doping in GFO. The leakage current density is significantly decreased (2.71 × 10⁻⁸ A/cm²) when Al and Co are co-doped in GFO. The ferroelectricity at room temperature is confirmed by the P-E measurements of the Al and Co co-doped GFO samples. The co-doped GFO samples showed better ferroelectric properties compared to bare sample. At room temperature, photoluminescence (PL) spectra have been recorded using 440 nm excitation for the reflection detections of Al and Co replacements on GFO. By using PL emission spectral analysis, the site disorder and cation redistribution have been also verified.

Graphical Abstract

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铝和钴共掺杂对溶胶-凝胶法合成的镓铁氧体的结构、电学和发光特性的协同效应

本手稿研究了铝和钴共掺杂对镓铁氧体（GFO）的结构、光学、P-E 和漏电流密度的协同影响。我们采用溶胶-凝胶法合成了多晶 Ga1-xAlxFeO3 (x = 0.0, 0.50) 和 Ga0.5Al0.5Fe1-yCoyO3 (y = 0, 0.025, 0.05) 样品。X 射线衍射分析表明，该样品具有与 Pc21n 空间群相对应的正方晶体结构，没有次级峰或杂质峰。随着 Al 和 Co 在 GFO 中的共掺杂，单位晶胞体积减小。当 Al 和 Co 共掺杂在 GFO 中时，漏电流密度明显降低（2.71 × 10-8 A/cm2）。对共掺杂 Al 和 Co 的 GFO 样品进行的 P-E 测量证实了它们在室温下的铁电性。与裸样品相比，共掺杂 GFO 样品显示出更好的铁电特性。在室温下，使用 440 纳米激发波长记录了光致发光（PL）光谱，以对 GFO 上的铝和钴替代物进行反射检测。通过 PL 发射光谱分析，还验证了位点无序和阳离子重新分布的情况。

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来源期刊

Journal of Sol-Gel Science and Technology 工程技术-材料科学：硅酸盐

CiteScore

4.70

自引率

4.00%

发文量

280

审稿时长

2.1 months

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.