揭示转化：NiFe2O4和CdFe2O4尖晶石纳米颗粒的结构、磁性、形貌、光学和微波吸收特性的比较研究

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects Pub Date : 2025-09-01 DOI:10.1016/j.nanoso.2025.101540

Shikhil S. Wanjari , Deoram V. Nandanwar , K.G. Rewatkar , Amit V. Gongal

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引用次数: 0

摘要

采用微波自燃烧法合成了nfe₂O₄（NFO）和CdFe₂O₄（CFO）尖晶石纳米颗粒（NPs），并对其结构、磁性、形貌和光学性能进行了比较。x射线衍射（XRD）证实，NiFe2O4和CdFe2O4 NPs均以尖晶石结构结晶，但晶格参数不同。平均晶粒尺寸为26 ~ 34 nm。两种NPs在室温下都具有高度顺磁性，其中NFO由于阳离子分布和尺寸效应而表现出更高的饱和磁化强度。扫描电镜（SEM）和高分辨率透射电镜（HR-TEM）显示球形、分散良好的NFO颗粒（30.11 nm）和团聚的CFO颗粒（48.55 nm）。傅里叶变换红外辐射（FT-IR）在416、509、609和596 cm−1处显示Fe-O和Ni/Cd-O拉伸振动，而tac图显示直接带隙为2.63 eV （NFO）和1.34 eV （CFO）。矢量网络分析仪（VNA）检测了Ku波段（12.4-18 GHz）的电磁和吸收参数。NFO和CFO在13.744 GHz处的RLs分别为−16 dB（97 %吸收）和−10 dB（90 %吸收），厚度分别为8 mm和10 mm。这些发现突出了镍铁氧体作为千兆赫应用的有效吸收剂，如雷达隐身、催化、能量存储和磁性设备。

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Unravelling the transformations: Comparative study of structural, magnetism, morphology, optical and microwave absorptions properties in NiFe2O4 and CdFe2O4 spinel nanoparticles

NiFe₂O₄ (NFO) and CdFe₂O₄ (CFO) spinel nanoparticles (NPs) were synthesized by microwave auto-combustion and compared for their structure, magnetic, morphological, and optical properties. The X-ray diffraction (XRD) confirmed that both NiFe₂O₄ and CdFe₂O₄ NPs crystallized in a spinel structure, though with different lattice parameters. The average crystallite size was 26–34 nm. Both NPs are highly paramagnetic at room temperature, with NFO showing higher saturation magnetization due to cation distribution and size effects. Scanning electron microscope (SEM) and High-resolution transmission electron microscope (HR-TEM) revealed spherical, well-dispersed NFO particles (30.11 nm) and agglomerated CFO particles (48.55 nm). Fourier transform infrared radiation (FT-IR) bands at 416, 509, 609, and 596 cm⁻¹ indicate Fe-O and Ni/Cd-O stretching vibration, while Tauc plots gave direct band gaps of 2.63 eV (NFO) and 1.34 eV (CFO). A vector network analyzer (VNA) examined electromagnetic and absorption parameters in the Ku band (12.4–18 GHz). NFO and CFO had RLs of −16 dB (97 % absorption) and −10 dB (90 % absorption) at 13.744 GHz with an 8 mm and 10 mm thickness. These findings highlight nickel ferrites as efficient absorbers for gigahertz applications such as radar stealth, catalysis, energy storage, and magnetic devices.

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来源期刊

Nano-Structures & Nano-Objects Physics and Astronomy-Condensed Matter Physics

CiteScore

9.20

自引率

0.00%

发文量

审稿时长

22 days

期刊介绍： Nano-Structures & Nano-Objects is a new journal devoted to all aspects of the synthesis and the properties of this new flourishing domain. The journal is devoted to novel architectures at the nano-level with an emphasis on new synthesis and characterization methods. The journal is focused on the objects rather than on their applications. However, the research for new applications of original nano-structures & nano-objects in various fields such as nano-electronics, energy conversion, catalysis, drug delivery and nano-medicine is also welcome. The scope of Nano-Structures & Nano-Objects involves: -Metal and alloy nanoparticles with complex nanostructures such as shape control, core-shell and dumbells -Oxide nanoparticles and nanostructures, with complex oxide/metal, oxide/surface and oxide /organic interfaces -Inorganic semi-conducting nanoparticles (quantum dots) with an emphasis on new phases, structures, shapes and complexity -Nanostructures involving molecular inorganic species such as nanoparticles of coordination compounds, molecular magnets, spin transition nanoparticles etc. or organic nano-objects, in particular for molecular electronics -Nanostructured materials such as nano-MOFs and nano-zeolites -Hetero-junctions between molecules and nano-objects, between different nano-objects & nanostructures or between nano-objects & nanostructures and surfaces -Methods of characterization specific of the nano size or adapted for the nano size such as X-ray and neutron scattering, light scattering, NMR, Raman, Plasmonics, near field microscopies, various TEM and SEM techniques, magnetic studies, etc .