Structural, magnetic and electromagnetic properties of microwave-hydrothermally synthesized Sr(Zr-Mn)2Fe12-2O19 hexaferrites

Sriramulu, G.; Maramu, N.; Reddy, Bhaskar; Katlakunta, Sadhana

doi:10.1016/j.materresbull.2022.111732

Cited by 16 publications

(4 citation statements)

References 48 publications

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“…The increase of CX concentration (15 wt.%) associated with the addition of CNT promoted the rise of ε' and ε'', improving the dielectric property. This effect can be attributed to a polarization interface due to the creation of dipoles between the CX interface and the polymer matrix 61,62 . The increase in the ε'', shown in Figure 9d, might be related to an increase in electrical conductivity, probably related to the higher concentration of porous carbon 29,63 .…”

Section: Electromagnetic Characterizationsmentioning

confidence: 99%

Sustainable Carbon Xerogel in the Production of Electromagnetic Radar Absorbing Composites in the Ku-Band

Medeiros

Silva

et al. 2022

Mat. Res.

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Carbonaceous porous materials are strong candidates for producing low-cost, lightweight, and sustainable electromagnetic (EM) absorbing materials. This work investigates the production of radarabsorbing materials (RAM) by a simple method. Sustainable carbon xerogel (CX) was synthesized from tannin, a biosourced molecule. CX and commercial carbon nanotube (CNT) were embedded in a silicone matrix at proportions of 10 and 15 wt.% of CX and 0.1 wt.% of CNT to produce flexible composites. The morphology and structure of the carbonaceous materials were evaluated by fieldemission scanning electron microscopy (FEG-SEM), Raman spectroscopy, X-ray diffraction (XRD), textural properties by N 2 adsorption-desorption isotherms, and mercury porosimetry. The electromagnetic characterization of the composites was analyzed by a vector network analyzer (VNA) in the Ku-band. The results demonstrated that an increased concentration of CX in the composite improved reflection loss reaching -43.19 dB at 13.79 GHz.

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Section: Electromagnetic Characterizationsmentioning

confidence: 99%

Sustainable Carbon Xerogel in the Production of Electromagnetic Radar Absorbing Composites in the Ku-Band

Medeiros

Silva

et al. 2022

Mat. Res.

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“…However, researchers have been trying to enhance its properties from the intrinsic magnetic structure so that barium hexaferrites can be efficiently utilized for data storage, magnetic recording, as well as a permanent magnet [11]. The electromagnetic properties of M-type hexaferrites have been tuned using alternative synthesis techniques [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Exploring the structural and magnetic trends in Ba_0.9Sm_0.1Fe_12−xAl_xO₁₉ M-type Hexaferrites

Asif¹,

Ranjha²,

Ghori³

et al. 2022

Phys. Scr.

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Current study describes the structural and magnetic properties of Ba0.9Sm0.1Fe12-xAlxO19 (x=0.0, 0.5, 1.0, 2.0, 3.0) M-type hexaferrites. Conventional ceramic route was implied to prepare all the nominal samples. Morphological analysis suggested the non-presence of secondary phases as well as formation of the hexaferrites material. X-ray Diffraction technique was used for structural analysis from which microstructural parameters are calculated and discussed. Magnetic properties are measured at room temperature. The saturation magnetization (Ms) and coercivity (Hc) values shows a cyclic and converse trend for synthesized samples. Firstly, a decrease in Ms and increase in Hc was observed up to intermediate dopant incorporation, and becomes converse for higher doping levels. The maximum coercivity and minimum magnetization is observed for Ba0.9Sm0.1Fe11Al1O19. The c/a and Mr/Ms ratio suggest the formation of perfect M-type hexaferrites. This work suggests that synthesized material is a good option for magnetic applications e.g., transformer and inductor cores, microwave devices, recording heads, and magnetic shielding.

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“…The powders were washed and dried at 80 °C for 10 h. The dried powders were ground and sintered at 350 °C for 4 h in muffle furnace. 24 Phase confirmation of the samples was acquired by an X-ray diffractometer (Shimadzu, XRD-7000, Tokyo, Japan) with Cu-Kα radiation (λ = 1.5406 Å) in the range 2θ = 20°− 80°. The Scanning electron microscope (SEM, Hitachi, Japan) was used for the microstructural analysis of the samples.…”

Section: Experimental Methodsmentioning

confidence: 99%

Enhanced Structural and Electrochemical Properties of Zn-Doped NiCo₂O₄ Synthesized by Low-Temperature Microwave Hydrothermal Process

Maheshwaram,

Gaddameedi,

Chidurala

et al. 2023

ECS J. Solid State Sci. Technol.

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The specific capacitance (Cp) is an important parameter influencing the energy storage capacity of materials. In this study, a series of NiZn x Co2-x O4 (x = 0.0–0.10) nanoparticles were prepared using the microwave-hydrothermal (M-H) method. The samples were characterized by using X-ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier transform Infrared (FTIR), X-ray photoelectron spectroscopy (XPS) and electrochemical studies. It is observed from X-ray diffraction that all the samples are cubic in nature with space group Fd-3m. The average lattice constant is varied in between 7.63 (x = 0.0) to 8.34 (x = 0.10). The linear increase in lattice constant is due to the difference in the ionic radii. The average grain size is in the range of 80 (x = 0.0) − 124 nm (x = 0.10) for all the samples, and grains are found to be spherical in nature. The characteristic metal oxygen vibration bands were observed at 578 cm−1 and 661 cm−1. The valence states of Ni2+/Ni3+, Co2+/Co3+ and Zn2+ were confirmed by X-ray photoelectron spectroscopy. The electrochemical studies were performed on all the samples. The high value of specific capacitance (Cp) 871.91 Fg−1 is observed for sample x = 0.06. Therefore, Zn doped NiCo2O4 shows good impedance and electrochemical properties which is promising material for supercapacitor applications.

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Structural, magnetic and electromagnetic properties of microwave-hydrothermally synthesized Sr(Zr-Mn)2Fe12-2O19 hexaferrites

Cited by 16 publications

References 48 publications

Sustainable Carbon Xerogel in the Production of Electromagnetic Radar Absorbing Composites in the Ku-Band

Sustainable Carbon Xerogel in the Production of Electromagnetic Radar Absorbing Composites in the Ku-Band

Exploring the structural and magnetic trends in Ba_0.9Sm_0.1Fe_12−xAl_xO₁₉ M-type Hexaferrites

Enhanced Structural and Electrochemical Properties of Zn-Doped NiCo₂O₄ Synthesized by Low-Temperature Microwave Hydrothermal Process

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Structural, magnetic and electromagnetic properties of microwave-hydrothermally synthesized Sr(Zr-Mn)2Fe12-2O19 hexaferrites

Cited by 16 publications

References 48 publications

Sustainable Carbon Xerogel in the Production of Electromagnetic Radar Absorbing Composites in the Ku-Band

Sustainable Carbon Xerogel in the Production of Electromagnetic Radar Absorbing Composites in the Ku-Band

Exploring the structural and magnetic trends in Ba0.9Sm0.1Fe12−xAlxO19 M-type Hexaferrites

Enhanced Structural and Electrochemical Properties of Zn-Doped NiCo2O4 Synthesized by Low-Temperature Microwave Hydrothermal Process

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Product

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Exploring the structural and magnetic trends in Ba_0.9Sm_0.1Fe_12−xAl_xO₁₉ M-type Hexaferrites

Enhanced Structural and Electrochemical Properties of Zn-Doped NiCo₂O₄ Synthesized by Low-Temperature Microwave Hydrothermal Process