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Structural and Optical Properties of Gadolinium Doped-Magnetite Nano-crystal for Photocatalytic Application
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2023-06-01 , DOI: 10.1016/j.jallcom.2023.170811
Neeraj Kadian, Renu Kumari, Ankit Panchal, Jasvir Dalal, Diwakar Padalia

Doped ferrite materials offer a combination of enhanced magnetic properties, multifunctionality, higher Curie temperature, biocompatibility, and potential energy applications. Their unique characteristics make them appealing for research in diverse fields, including materials science, electronics, biomedical engineering, and energy technology. In present work, Gadolinium-doped magnetite samples are synthesized following the co-precipitation method. The effects of doping on the structural and optical properties of Fe3O4 are studied. Structural parameters of the samples such as cell parameters, cell volume crystalline size, x-ray density, and average micro-strain are calculated from the analysis of x-ray diffraction (XRD) data via Rietveld refinement method. An increase in crystalline size and cell volume is observed while a reduction in micro-strain is observed with increase in doping concentration. The particle size estimated from FE-SEM data ranges from 9 -16 nm and is in good agreement with XRD data and confirms the formation of nanoscopic phase of the particles. The presence of characteristic peaks concerned with tetrahedral and octahedral site vibrations in the Fourier transform infrared spectroscopy data approve the formation of inverse spinel structure. The distribution of Gd in the samples is determined with Energy dispersive x-ray analysis. The optical studies show that the direct and indirect band gaps decrease from 4.07 to 3.95 eV and 3.79 to 3.65 eV, respectively. These values of band gap are indicated the potential use of the synthesized nanoparticles for photocatalytic application.



中文翻译:

用于光催化应用的钆掺杂磁铁矿纳米晶的结构和光学性质

掺杂铁氧体材料结合了增强的磁性、多功能性、更高的居里温度、生物相容性和势能应用。它们独特的特性使它们对不同领域的研究具有吸引力,包括材料科学、电子学、生物医学工程和能源技术。在目前的工作中,掺钆磁铁矿样品是按照共沉淀法合成的。研究了掺杂对Fe 3 O 4结构和光学性质的影响。样品的结构参数,如细胞参数、细胞体积晶体尺寸、x射线密度和平均微应变是根据x的分析计算的-射线衍射 (XRD) 数据,通过 Rietveld 细化方法。随着掺杂浓度的增加,观察到晶体尺寸和晶胞体积增加,同时观察到微应变减少。从 FE-SEM 数据估计的粒径范围为 9 -16 nm,与 XRD 数据非常一致,证实了颗粒纳米级相的形成。傅里叶变换红外光谱数据中与四面体和八面体位点振动有关的特征峰的存在证实了反尖晶石结构的形成。Gd 在样品中的分布通过能量色散x射线分析确定。光学研究表明,直接和间接带隙从 4.07 减少到 3.95  eV,从 3.79 减少到 3.65 eV,分别。这些带隙值表明合成纳米粒子在光催化应用中的潜在用途。

更新日期:2023-06-02
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