Effect of rare earth substitution on electromagnetic and microwave absorption properties of nickel-cobalt nano ferrite

Sahu, Somnath; Gurrala, Ravi Chandra; Dobbidi, Pamu

doi:10.1016/j.ceramint.2023.10.073

Cited by 9 publications

(1 citation statement)

References 59 publications

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“…Among various magnetic substances, cobalt ferrite (CoFe 2 O 4 ) stands out for its stable chemical and excellent magnetic properties [14,15]. Additionally, it has been confirmed that the magnetic loss of iron oxide can be improved by doping it with rare-earth ions [15][16][17]. The slight addition of rare-earth ions modifies the coercivity, magnetic crystal anisotropy field, and diffusion activation energy of ferrite crystals, leading to an increase in magnetic-hysteresis loss.…”

Section: Introductionmentioning

confidence: 99%

A Novel Low-Density-Biomass-Carbon Composite Coated with Carpet-like and Dandelion-Shaped Rare-Earth-Doped Cobalt Ferrite for Enhanced Microwave Absorption

Shang,

Zhu,

Shang

et al. 2024

Molecules

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A novel low-density composite for the absorption of microwaves was prepared by loading La-doped spinel cobalt ferrite (La-CFO) onto biomass carbon (BC) derived from corn stalks using a hydrothermal method. This composite (La-CFO@BC) not only maintained the advantageous properties of low density and abundant porosity, but also exhibited a unique morphology, with La-CFO displaying a carpet-like structure interspersed with dandelion-shaped particles. The incorporation of La-CFO effectively tuned the electromagnetic parameters of the composite, thereby improving its impedance-matching attributes and its ability to absorb microwave radiation. At a frequency of 12.8 GHz for electromagnetic waves and with a thickness of 2.5 mm, La-CFO@BC demonstrated remarkable performance in microwave absorption, attaining a noteworthy minimum reflection (RLmin) of −53.2 dB and an effective absorption bandwidth (EAB) of 6.4 GHz. Furthermore, by varying the thickness of the La-CFO@BC within the range of 1.0 to 5.5 mm, the EAB could be broadened to 13.8 GHz, covering the entire X-band, the entire Ku-band, and a substantial portion of the C-band. This study demonstrated that La-CFO@BC was a promising alternative for electromagnetic wave attenuation, which offered superior performance in microwave absorption.

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Section: Introductionmentioning

confidence: 99%

A Novel Low-Density-Biomass-Carbon Composite Coated with Carpet-like and Dandelion-Shaped Rare-Earth-Doped Cobalt Ferrite for Enhanced Microwave Absorption

Shang,

Zhu,

Shang

et al. 2024

Molecules

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Biomimetic Multi‐Interface Design of Raspberry‐like Absorbent: Gd‐doped FeNi₃@Covalent Organic Framework Derivatives for Efficient Electromagnetic Attenuation

Hu,

He,

Luo

et al. 2024

Small Methods

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Structural design and interface regulation are useful strategies for achieving strong electromagnetic wave absorption (EMWA) and broad effective absorption bandwidth (EAB). Herein, a monomer‐mediated strategy is employed to control the growth of covalent organic framework (COF) wrapping flower‐shaped Gd‐doped FeNi3 (GFN), and a novel raspberry‐like absorbent based on biomimetic design is fabricated by thermal catalysis. Further, a unique dielectric‐magnetic synergistic system is constructed by utilizing the COF‐derived nitrogen‐doped porous carbon (NPC) as the shell and anisotropic GFN as the core. The electromagnetic parameters of the GFN@NPC composites can be tuned by adjusting the proportions of GFN and NPC. Off‐axis electron holography results further clarify the interface polarization and microscale magnetic interactions affecting the EMW loss mechanism. As a result, the GFN@NPC samples exhibit broad EMWA performance. The EAB values of all GFN@NPC composites reach up to 6.0 GHz, with the GFN@NPC‐2 sample showing a minimum reflection loss (RLmin) of −69.6 dB at 1.68 mm. In addition, GFN@NPC‐2 achieves a maximum radar cross–section (RCS) reduction of 29.75 dB·m2. A multi‐layer gradient structure is also constructed using metamaterial simulation to achieve an ultra‐wide EAB of 12.24 GHz. Overall, this work provides a novel bio‐inspired design strategy to develop high‐performance EMWA materials.

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Structural, magnetic and dielectric properties of Terbium substituted nanosized Nickel-Ferrites from a new perspective

Saha,

Routray

2024

J Sol-Gel Sci Technol

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The current research focuses on the synthesis of nickel spinel ferrite nanoparticles doped with rare earth elements via green synthesis-assisted sol-gel auto combustion method. X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), Raman spectra were carried to examine the development of phase, morphology, and crystal structure. Structural parameters, cation distribution, and lattice strain were determined through Rietveld analysis and Williamson-Hall (W-H) plots. Using the G-Fourier technique, the electron density mapping of Nickel nano-ferrites replaced with rare earth (Tb) elements was computed.Nickel-ferrites' room-temperature hysteresis curve was measured using a vibrating sample magnetometer (VSM). The insignificant hysteresis curve with small coercivity value and retentivity seen demonstrates the soft behavior. A thorough discussion was held regarding the impact of substituting non-magnetic ions on the coercivity, permeability, magnetic interaction constant, and Curie temperature of the synthesized ferrite. When terbium is added, the samples' saturation magnetization lowers because of spin canting phenomena and a decrease in particle size, which results in a decreased surface-to-volume ratio. Nanocrystalline ferrites replaced with rare earth elements have numerous advanced technical applications, including high-frequency devices and switching devices.

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Effect of rare earth substitution on electromagnetic and microwave absorption properties of nickel-cobalt nano ferrite

Cited by 9 publications

References 59 publications

A Novel Low-Density-Biomass-Carbon Composite Coated with Carpet-like and Dandelion-Shaped Rare-Earth-Doped Cobalt Ferrite for Enhanced Microwave Absorption

A Novel Low-Density-Biomass-Carbon Composite Coated with Carpet-like and Dandelion-Shaped Rare-Earth-Doped Cobalt Ferrite for Enhanced Microwave Absorption

Biomimetic Multi‐Interface Design of Raspberry‐like Absorbent: Gd‐doped FeNi₃@Covalent Organic Framework Derivatives for Efficient Electromagnetic Attenuation

Structural, magnetic and dielectric properties of Terbium substituted nanosized Nickel-Ferrites from a new perspective

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Effect of rare earth substitution on electromagnetic and microwave absorption properties of nickel-cobalt nano ferrite

Cited by 9 publications

References 59 publications

A Novel Low-Density-Biomass-Carbon Composite Coated with Carpet-like and Dandelion-Shaped Rare-Earth-Doped Cobalt Ferrite for Enhanced Microwave Absorption

A Novel Low-Density-Biomass-Carbon Composite Coated with Carpet-like and Dandelion-Shaped Rare-Earth-Doped Cobalt Ferrite for Enhanced Microwave Absorption

Biomimetic Multi‐Interface Design of Raspberry‐like Absorbent: Gd‐doped FeNi3@Covalent Organic Framework Derivatives for Efficient Electromagnetic Attenuation

Structural, magnetic and dielectric properties of Terbium substituted nanosized Nickel-Ferrites from a new perspective

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Biomimetic Multi‐Interface Design of Raspberry‐like Absorbent: Gd‐doped FeNi₃@Covalent Organic Framework Derivatives for Efficient Electromagnetic Attenuation