High-frequency dielectric response of 3d metal (Mn and Cu) doped zinc ferrite nanoparticles for microwave applications

Mahmood, Aamir; Maqsood, Asghari

doi:10.1016/j.mtcomm.2022.105042

Cited by 7 publications

(4 citation statements)

References 31 publications

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“…Although 1D structures were damaged, the existence of surface conductive carbon layers ensured high electrical conductivity. It is also worth mentioning that dielectric relaxation significantly enhances its dielectric loss at frequencies near 11 GHz . For the same reason, S-600 has an even higher tan δ E than S-800 in the frequency range of 11.76–12.72 GHz.…”

Section: Results and Discussionmentioning

confidence: 94%

“…It is also worth mentioning that dielectric relaxation significantly enhances its dielectric loss at frequencies near 11 GHz. 34 For the same reason, S-600 has an even higher tan δ E than S-800 in the frequency range of 11.76−12.72 GHz. While at other frequencies, S-600 has the second lowest tan δ E , resulting from residue TiO 2 shells and long current paths inside luffalike particles.…”

Section: Resultsmentioning

confidence: 96%

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Nanorod-Derived Conductive Carbon Networks and Titanates-Involved Multicomponent Interfaces for Broadband Microwave Absorption

Liu,

Cao,

Duan

et al. 2024

ACS Appl. Nano Mater.

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Conductive carbon networks and multicomponent interfaces have been constructed in Fe 3 O 4 /TiO 2 /C or Fe 2 TiO 4 / FeTiO 3 /C composites by pyrolyzing core−shell structured Febdc@TiO 2 nanorods at different temperatures. When the temperature rises to 700 °C, the growth of internal Fe 3 O 4 nanoparticles, the gradual damage of TiO 2 shells, and the maintenance of a onedimensional structure promote the formation of continuous conductive carbon networks in paraffin, thereby increasing complex permittivity and dielectric loss. With a further increase in temperature, phase conversion from ferromagnetic Fe 3 O 4 to antiferromagnetic Fe 2 TiO 4 and FeTiO 3 would result in the depletion of TiO 2 and C, generation of multiple interfaces, and collapse of the one-dimensional structure, causing a slight reduction in complex permittivity and dielectric loss. S-700 has a wide effective absorption bandwidth (EAB) of 6.84 GHz at 2.2 mm (covering the entire Ku band), and S-800 has a large EAB of 4.16 GHz at 2.8 mm, covering the entire X band. We can deduce that conductive carbon networks mainly composed of surface carbon and multiple interfaces between carbon and titanates with defects contribute significantly to conduction loss, dipole polarization, and interfacial polarization, both of which shape RL curves under the influence of interference cancellation. This work provides a feasible strategy based on the construction of conductive networks and multicomponent interfaces in metal−organic framework-derived carbon composites for broadened microwave absorption bandwidth.

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Section: Results and Discussionmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 96%

Nanorod-Derived Conductive Carbon Networks and Titanates-Involved Multicomponent Interfaces for Broadband Microwave Absorption

Liu,

Cao,

Duan

et al. 2024

ACS Appl. Nano Mater.

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“…Ferrites are magnetic materials that can be used in a wide variety of applications in various fields, such as medicine and electronics 1,2 . In medicine, they can be utilized as magnetic resonance contrast agents to obtain high-resolution medical images.…”

Section: Introductionmentioning

confidence: 99%

Structural and Magnetic Characterization of Ni-Co Mixed Ferrite Nanopowders Synthesized via Coprecipitation and Sol-Gel Methods

Márquez,

Pérez,

Sagredo

2024

Mat. Res.

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Ni 0.5 Co 0.5 Fe 2 O 4 nanoparticulate powders were synthesized using coprecipitation and sol-gel methods. The crystalline structure of the nanocompounds was determined through X-ray diffraction analysis. The chemical composition of the synthesized nanopowders was analyzed using infrared spectroscopy measurements. The size, morphology, and aggregation of the nanoparticles were determined from electron microscopy images. The magnetic properties of the nanocompounds were studied through magnetization measurements as a function of temperature and applied magnetic field. The synthesized powders consist of aggregates of nanoparticles with mean particle sizes of 24 nm and 43 nm, with those synthesized using the coprecipitation method being smaller. The compounds exhibited a single crystalline phase corresponding to the cubic spinel structure, with a unit cell parameter of approximately 8.35 Å and an inversion parameter with values of 0.94 and 0.95. The synthesized Ni-Co mixed ferrites presented an ordered magnetic behavior below 320 K, with the nanoparticles being in the blocked magnetic regime.

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“…Ferrites are magnetic oxides of iron and other chemical elements that have high magnetic permeability and low electrical conductivity, making them useful materials for absorbing high-frequency energy, which is why they are used as transformer cores, inductors, and filters to absorb and eliminate unwanted signals or radio frequency interference in circuits [1]- [3]. Ferrites are materials with a great response and sensitivity in the presence of magnetic fields, which has allowed them to be used to detect the intensity and direction of magnetic fields generated by electric motors and other devices [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Substitution of Co by Ni on the Crystal Structure and Magnetic Properties of Cobalt Ferrite Nanoparticles

Márquez¹,

Sagredo²

2023

Proceedings of the 21th LACCEI International Multi-Conference for Engineering, Education and Technology (LACCEI 2023): “Leaders

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Ni1-xCoxFe2O4 (x = 1.0, 0.8, 0.6, and 0.5 ) nanoparticles were synthesized using the coprecipitation method and subsequent thermal treatment at 800 °C. The structural characterization of the nanoparticles was carried out using X-ray Diffraction, finding that all the compounds presented a single crystalline phase corresponding to the cubic spinel structure. As the concentration of Ni in the compounds increases, a decrease in the lattice parameter was obtained because of the fact that Ni 2+ cations are smaller than Co 2+ . The size, morphology and dispersion of the nanoparticles were analyzed by Transmission Electron Microscopy, finding that the nanocompounds are formed by aggregates of nanoparticles with irregular shapes and mean particle sizes between 34 and 42 nm. The magnetic properties of CoFe2O4 and Co0.5Ni0.5Fe2O4 nanoparticles were studied from magnetization measurements as a function of temperature, in ZFC and FC modes, and magnetization measurements as a function of the applied magnetic field. It was obtained that the nanoparticles are in the blockedmagnetic regime in the temperature range from 5 to 320 K. At 5 K, the compounds have large coercive fields of 10683 and 7518 Oe, for CoFe2O4 and Co0.5Ni0.5Fe2O4, respectively. It was found that the values of saturation magnetization, remanent magnetization, and coercive field decrease when replacing Co 2+ by Ni 2+ in Co ferrite, because the magnetic moments of divalent nickel cations are smaller than those of Co 2+ cations.

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High-frequency dielectric response of 3d metal (Mn and Cu) doped zinc ferrite nanoparticles for microwave applications

Cited by 7 publications

References 31 publications

Nanorod-Derived Conductive Carbon Networks and Titanates-Involved Multicomponent Interfaces for Broadband Microwave Absorption

Nanorod-Derived Conductive Carbon Networks and Titanates-Involved Multicomponent Interfaces for Broadband Microwave Absorption

Structural and Magnetic Characterization of Ni-Co Mixed Ferrite Nanopowders Synthesized via Coprecipitation and Sol-Gel Methods

Effect of the Substitution of Co by Ni on the Crystal Structure and Magnetic Properties of Cobalt Ferrite Nanoparticles

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