Composition dependence of structural, magnetic and electrical properties of Co substituted magnesium ferrite

Ramarao, K.V.S.; Babu, B. Rajesh; Babu, B.; Veeraiah, V.; Ramarao, S.D.; Rajasekhar, K.; Rao, A. T.

doi:10.1016/j.physb.2017.10.072

Cited by 18 publications

(3 citation statements)

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“…It is observed that a control over grain size and cation distribution is important to enhance the electric and magnetic properties. We have also examined the influence of divalent ion substitution like Co 2+ [26] and Zn 2+ [27] in MgFe 2 O 4 . It is observed that Ni 2+ substitution enhances the magnetic and electrical properties when compared with Co 2+ and Zn 2+ substitution.…”

Section: Discussionmentioning

confidence: 99%

Enhancement in magnetic and electrical properties of Ni substituted Mg ferrite

Ramarao

Babu

et al. 2018

Materials Science-Poland

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In this work, Ni substituted magnesium spinel ferrites having general formula Mg 1 − x Ni x Fe 2 O 4 (where x = 0.0, 0.1, 0.15, 0.2, 0.25 and 0.3) were synthesized by standard solid state reaction method. All the samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), vibrating sample magnetometer (VSM), DC resistivity measurements. X-ray diffraction analysis confirmed the single spinel phase. The lattice constant decreased with increasing Ni content due to the difference in the ionic radii of Mg 2+ and Ni 2+ ions. The FT-IR spectra reveled two prominent frequency bands in the wave number range of 400 cm −1 to 600 cm −1 , which confirmed the cubic spinel structure of obtained compound and completion of chemical reaction. Magnetic studies revealed that the saturation magnetization increased with the substitution of Ni. The increase in magnetization was explained on the basis of distribution of magnetic and non-magnetic cations among A and B sites of the spinel lattice. A significant influence of cation distribution on DC electrical resistivity and activation energy was observed.

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Section: Discussionmentioning

confidence: 99%

Enhancement in magnetic and electrical properties of Ni substituted Mg ferrite

Ramarao

Babu

et al. 2018

Materials Science-Poland

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“…Cobalt ferrite possesses reasonably high electrical resistivity, coercivity, moderate saturation magnetisation, large magnetostriction (λ s ∼ 110 × 10 −6 ) and a stable ferromagnetic phase even at higher temperatures, making it suitable for sensor and actuator applications [1][2][3][4][5][6][7]. However, several intrinsic and extrinsic parameters such as cation distribution, crystallite size, chemical composition, uniform grain size, porosity, and method of preparation play key role in tailoring the electrical, magnetic, and optical properties of these cobalt ferrites.…”

Section: Introductionmentioning

confidence: 99%

Structural, magnetic and antibacterial studies of gadolinium doped cobalt ferrite nanoparticles synthesized at low temperature

Reddy¹,

Rao²,

Babu³

et al. 2023

Adv. Nat. Sci: Nanosci. Nanotechnol.

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In this work structural, magnetic and antimicrobial studies of gadolinium (Gd) doped cobalt ferrite nanopowder samples were synthesised through facile auto-combustion route using citric acid as combustion agent. The pristine nanopowders were sintered at 600 °C. X-ray diffraction (XRD), infrared spectroscopy (IR) measurements indicated the formation of a single spinel phase. The lattice constant gradually increased from 8.3801 Å to 8.3915 Å with increasing Gd concentration. The average crystallite size varied from 54 nm to 42.7 nm. The correlation between the cation distribution from XRD and the magnetic properties is discussed. The substitution of Gd ions significantly reduced the magnetisation from 60.6 to 36.6 emu g−1 and increased the coercivity. Antimicrobial activities of pure and Gd substituted cobalt ferrite are carried out against Gram-positive (Bacillus subtilis) and Gram-negative (Escherichia coli, Pseudomonas aeruginosa) and also against fungi strain (Aspergillus niger) pathogens, suggesting that Gd substitution significantly improves the activity of cobalt ferrite nanopowders.

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“…In previous years, Co-Mg ferrite has been produced with different production methods by substituted metals such as Cr, Cu, Al, Zn, Ni etc. with various stoichiometric ratios and their dielectric and conductivity properties, especially their structural and magnetic properties have been investigated (Ahmad et al, 2014;Patil et al, 2014;Gao et al, 2015;Kaur et al, 2015;Sharma et al, 2015;Mund and Ahuja, 2017;Jadoun et al, 2018;Ramarao et al, 2018;Sun et al, 2018). Also, there are investigations of La-Mg and La-Co mixed ferrites in the literature separately (Yang et al, 2018;Gaba et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Frequency Dependence of Dielectric, Conductivity, Impedance and Electrical Modulus Properties of La3+ Substituted in Cobalt- Magnesium Ferrites

Kuru

2021

Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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In this study, structural, morphological, dielectric and AC conductivity properties of CoMgLa ferrite samples (Co0.5Mg0.5LaxFe2-xO4) were investigated according to the change of x (x=0, 0.1, 0.2, 0.3, 0.4 and 0.5). Samples were synthesized by co-precipitation method. The structural properties were examined using XRD and results show that the prepared sample crystallizes in the cubic spinel structure. Crystallite sizes are changing between 24.92 to 9.80 nm. Morphological and elemental properties were analyzed by SEM and EDX. Dielectric properties were investigated by impedance spectroscopy. The samples showed normal dielectric properties consistent with the Maxwell-Wagner model due to interfacial polarization. When the impedance characteristics were examined, it was found that the relaxation process was compatible with the Cole-Cole model. The results of the modulus show that grains contribute to the relaxation process as well as grain boundaries. AC conductivity exhibited semiconductor behavior. The constant behavior of conductivity at low frequencies is a sign that the examined samples may be suitable for many applications.

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Composition dependence of structural, magnetic and electrical properties of Co substituted magnesium ferrite

Cited by 18 publications

References 10 publications

Enhancement in magnetic and electrical properties of Ni substituted Mg ferrite

Enhancement in magnetic and electrical properties of Ni substituted Mg ferrite

Structural, magnetic and antibacterial studies of gadolinium doped cobalt ferrite nanoparticles synthesized at low temperature

Frequency Dependence of Dielectric, Conductivity, Impedance and Electrical Modulus Properties of La3+ Substituted in Cobalt- Magnesium Ferrites

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