Magnetic and Dielectric Properties of CoFe₂O₄ and CoxZn1-xFe₂O₄ Nanoparticles Synthesized Using Sol-Gel Method

The structural, magnetic, and dielectric properties of a series of Ni2+ substituted cobalt nanoferrite particle samples with the composition Co1−xNixFe2O4 (where x = 0.0 ≤ x ≤ 1.0) synthesized by using the sol-gel auto combustion route are presented in this report. The electromagnetic interference shielding of Co1−xNixFe2O4/PVA nanocomposite films has been determined in the microwave X-band (8.2–12.4 GHz) frequencies. X-ray analysis revealed the single-phase formation of nickel-substituted cobalt nanoferrite samples. The decreasing trend of lattice parameters with Ni2+ substitution indicates the incorporation of Ni2+ into the crystal structure, obeying Vegard’s law. FTIR showed the absorption bands at 560–590 cm−1 ( v 1 ) and 390–400 cm−1 ( v 2 ) were attributed to (A-site) tetrahedral and (B-site) octahedral groups complex, respectively which confirm the spinel structure of the samples. Field emission scanning electron microscopy showed agglomerated grains of different sizes and shapes in the morphological observation. EDS reveals the chemical composition of the prepared samples. TEM analysis revealed that the synthesized particles were nearly monodisperse, show to be roughly spherical in shape, and have a polycrystalline nature. The dielectric constant and loss tangent (tanδ) is found to decrease with increasing frequency which shows normal behavior for ferrimagnetic materials. The magnetic properties determined using VSM have substantially changed with the substitution of Ni2+ ions. The saturation magnetization and the experimentally magnetic moment are observed to decrease with an increase in Ni2+ content x. A series of Co1−xNixFe2O4/PVA nanocomposite films are prepared by applying simple, rapid, and inexpensive methods for EMI shielding materials. The vector network analyzer data were used to evaluate the electromagnetic interference (EMI) shielding properties of the Co1−xNixFe2O4/PVA samples. At 9.2 GHz, a study of reflection loss showed a minimum reflection loss (RL) of −32.08 dB. Also, the synthesized Co1−xNixFe2O4/PVA nanocomposite samples show improved performance for EMI efficiency which proves the utility of this doping. With this low RL value, the results and techniques also promise a simple, effective approach to achieve light-weight Co1−xNixFe2O4/PVA nanocomposite films and make it excellent microwave absorbers, capable of working at gigahertz frequencies for application potentials in EMI shielding material, communication, radar stealth technology, and electronic warfare.

show abstract

“…Since each primitive unit cell of the spinel structure contains 8 molecules, the value of the X-ray density ρ x was calculated according to [34]…”

Section: Crystallographic Analysismentioning

confidence: 99%

Electromagnetic Interference Shielding and Characterization of Ni2+ Substituted Cobalt Nanoferrites Prepared by Sol-Gel Auto Combustion Method

Kuekha

Mubarak

Azhdar

2022

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

show abstract

“…The entire summits have good competition among the standard pattern of bulk CoFe2O4 (JCPDS 22-1086). The crystallite size of nanoparticle was set commencing the stoutest peak (311) of XRD using the Scherrer formula [11,22]:…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Antibacterial Activity of Cobalt Ferrite (CoFe<sub>2</sub>O<sub>4</sub>) Nanoparticles against Oral Enterococci

Sulaiman

Hamdoon

Abdul-Rahman

2021

MSF

View full text Add to dashboard Cite

This study aimed to show the enhanced effect of nanoparticles cobalt ferrite CoFe2O4 with chlorhexidine on Enterococcus faecium isolated from failure root canal treatment cases. Sol-gel technique was used to prepare the spinel cobalt ferrite CoFe2O4 at 200 °C then sintering at 400 °C & 600 °C, whereas the antimicrobial susceptibility test of nanoparticles was carried out according to the Kirby-Bauer technique compared with chlorhexidine. Fifteen isolates of Enterococcus faecium obtained by inserting sterile paper points in root canals, from patients who consulted the Teaching Hospital of Dentistry College at the University of Mosul, Iraq. For the first time, results showed that the nanoparticle cobalt ferrite CoFe2O4 at 400 °C and 600 °C, when mixed with chlorhexidine, give the mean inhibition zone 8.5334 mm and 8.0667mm respectively, while the pure chlorhexidine was providing a mean inhibition zone of 3.1667 mm, and also the nanoparticles cobalt ferrite in both cases of sintering without mixing, there was no antimicrobial effect. Statistical analysis using Duncan showed significant differences among groups (p < 0.05).

show abstract

“…In addition, it is used in radio-frequency circuits, high-quality filters, rod antennas, and transformer cores [2]. The tetrahedral (A) sites are occupied by Zn 2? and Fe 3? ions, and the octahedral sites (B) are occupied by Ni 2? and Fe 3? ions in the spinel formula AB 2 O 4 [3,4].…”

Section: Introductionmentioning

confidence: 99%

Structural and elastic properties of nickel–zinc ferrite nano-particles doped with lithium

Ismail

Jaber

2018

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

The X-ray and Fourier transform infrared (FTIR) spectroscopy are used to studying the structural and elastic properties of Ni-Zn ferrite doped lithium according to the chemical formula Ni 1−x Zn x−2y Li y Fe 2?y O 4 , where (0≤x≤0.5) and (y=0, 0.01, 0.02, 0.03, and 0.04) which preparation by sol-gel method. Lattice constant (a), crystallite size, and cation distribution are deduced from XRD. FTIR measurement exhibits that two absorption bands (ν 1 and ν 2) around 400-800 cm −1 that confirm the existence of tetrahedral and octahedral sites of ferrite. Force constant, elastic wave velocity, bulk modulus, and young's modulus also reported. The force constant for A-site is larger than for B-site which vary between (K A =131.6-145.5 N/m) and (K B =97.8-102.3 N/m) where can be found the values of elastic constant for nanoparticle is agreement with those of bulk material.

show abstract

Magnetic and Dielectric Properties of CoFe₂O₄ and CoxZn1-xFe₂O₄ Nanoparticles Synthesized Using Sol-Gel Method

Cited by 19 publications

References 0 publications

Electromagnetic Interference Shielding and Characterization of Ni2+ Substituted Cobalt Nanoferrites Prepared by Sol-Gel Auto Combustion Method

Electromagnetic Interference Shielding and Characterization of Ni2+ Substituted Cobalt Nanoferrites Prepared by Sol-Gel Auto Combustion Method

Antibacterial Activity of Cobalt Ferrite (CoFe<sub>2</sub>O<sub>4</sub>) Nanoparticles against Oral Enterococci

Structural and elastic properties of nickel–zinc ferrite nano-particles doped with lithium

Contact Info

Product

Resources

About