Induced effects of Zn+2 on the transport and complex impedance properties of Gadolinium substituted nickel-zinc nano ferrites

Kumar, Mirgender; Shankarmurthy, G.J.; Melagiriyappa, E.; Nagaraja, K.K.; Jayanna, H. S.; Telenkov, M. P.

doi:10.1016/j.jmmm.2019.01.058

Cited by 28 publications

(5 citation statements)

References 54 publications

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“…Generally, ferrites comprise iron oxide as a main constituent, and metal oxides. Ferrites are divided into different categories depending upon the crystal structure, i.e., spinel ferrite, garnet, ortho-ferrite, and hexagonal ferrites, each having its importance [9,10,11]. However, substituted M-type hexaferrite possess promising potential application in advanced technology.…”

Section: Introductionmentioning

confidence: 99%

Influence of Zn+2 Doping on Ni-Based Nanoferrites; (Ni1−x ZnxFe2O4)

2019

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Nickel zinc nanoferrites (Ni1−xZnxFe2O4) were synthesized via a chemical co-precipitation method having stoichiometric proportion (x) altering from 0.00 to 1.00 in steps of 0.25. The synthesized nanoparticles were sintered at 800 °C for 12 h. X-ray diffraction patterns illustrate that the nanocrystalline cubic spinel ferrites have been obtained after sintering. The Scherrer formula is used to evaluate the particle size using the extreme intense peak (311). The experimental results demonstrate that precipitated particles’ size was in the range of 20–60 nm. Scanning electron microscopy (SEM) is used to investigate the elemental configuration and morphological characterizations of all the prepared samples. FTIR spectroscopy data for respective sites were examined in the range of 300–1000 cm−1. The higher frequency band ν1 were assigned due to tetrahedral complexes while lower frequency band ν2 were allocated due to octahedral complexes. Our experimental results demonstrate that the lattice constant a0 increases while lattice strain decreases with increasing zinc substitution in nickel zinc nanoferrites.

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Section: Introductionmentioning

confidence: 99%

Influence of Zn+2 Doping on Ni-Based Nanoferrites; (Ni1−x ZnxFe2O4)

2019

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“…When compared to previously reported values, the sample's DC conductivity is reduced. The consequent impact is due to the magnetic coupling interaction of hopping elections at localized bands, tending to enlarge the energy bands in nanoparticles [44].…”

Section: Electrical Conductivitymentioning

confidence: 99%

Influence of divalent metal ion (Zn²⁺) on magnetic properties, curie temperature and DC electrical properties in Ce³⁺ substituted Ni-Zn ferrites

V¹,

Alhadhrami²,

Shankaramurthy³

et al. 2022

Phys. Scr.

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Nanoparticles of Ni1-xZnxCe0.1Fe1.9O4 ferrite substituted with Zn2+ ion concentrations (0.0, 0.2, 0.4, 0.6, 0.8 & 1.0) have been synthesised via aqueous citrate precursor auto combustion method. The obtained Powder X-ray diffraction data suggests a good crystalline phase; the crystallite size exists in the range of 14~38 nm. The lattice constant of samples increases with Zn2+ concentration. It validates Vegard's law and the decreasing trends in porosity of the samples are identified. The inhomogeneity in the grains was confirmed from FE-SEM. The EDS spectrogram attributes the good stoichiometry in the product. The Thermogravimetric analysis reveals that the crystallization occurred within the temperature 800˚C. The high-temperature DC conductivity of the samples shows that NTC behaviour. The Curie temperature and activation energy are estimated and the activation energy of carriers are found to be more at the paramagnetic region. The magnetic saturation ('Ms*') has maximum for Zn2+ = 0.2 (57.7 emu/g) and coercive field (Hc) related with a radius of occupancy of Zn2+ ion validates the relation Hc∝1/r and also, the value of the remanence ratio suggests that isotropic magnetization took place in the heterogeneous material.

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“…The result in the drop is mainly due to the creation of defects and vacancies of Zn 2+ ions in the tetrahedral site because of the high volatility of Zn 2+ ions compared to Ni 2+ ions. To some extent, the oxygen vacancies were also created at the higher concentrations of Zn 2+ [13].…”

Section: Impedance Spectroscopymentioning

confidence: 99%

“…Ni-Zi ferrites are also stable magnetic materials for making composites with various resins which is useful for moulding [8]. In the literature, ferrites are synthesized using high-energy ball milling [9], the low-cost sol-gel method [10], micro emulsion process [11], hydrothermal technique [12] and citrate precursor auto combustion method [13]. Among these, the solution processing of nano-crystalline Ni-Zn ferrites has attracted considerable interest due to the tailoring of their physical properties, recently identified with the highest magnetization value i.e.…”

Section: Introductionmentioning

confidence: 99%

Effects of γ-irradiation on AC electrical and impedance spectroscopy of Ni-Zn nano ferrites

V¹,

Alzahrani²,

Shankaramurthy³

et al. 2022

Phys. Scr.

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Herein we report the effect of γ-irradiation on AC electrical properties of Ni-Zn nanoparticles Ni1-xZnxFe2O40≤x≤1synthesized via the citrate auto-combustion technique. The X-ray diffraction (XRD), analysis of the samples revealed a decreasing trend of the crystallite size with increasing concentration of Zn2+ ion. The lattice constant was found to increases with Zn2+concentration with the highest for x=0.6. The AC-electrical behaviour of the sample were studied before and after γ-irradiation in the frequency range 1MHz-23MHz. Studies show that the dielectric constant increased up on irradiation whereas the dielectric loss and AC conductivity decline after irradiation. The dielectric relaxation changes from non-Debye to Havriliak–Negami relaxation, which is the significance of asymmetric broadness in the relaxation process. The collective AC electrical propertis signifies the radiation absorption respons.

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Induced effects of Zn+2 on the transport and complex impedance properties of Gadolinium substituted nickel-zinc nano ferrites

Cited by 28 publications

References 54 publications

Influence of Zn+2 Doping on Ni-Based Nanoferrites; (Ni1−x ZnxFe2O4)

Influence of Zn+2 Doping on Ni-Based Nanoferrites; (Ni1−x ZnxFe2O4)

Influence of divalent metal ion (Zn²⁺) on magnetic properties, curie temperature and DC electrical properties in Ce³⁺ substituted Ni-Zn ferrites

Effects of γ-irradiation on AC electrical and impedance spectroscopy of Ni-Zn nano ferrites

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Induced effects of Zn+2 on the transport and complex impedance properties of Gadolinium substituted nickel-zinc nano ferrites

Cited by 28 publications

References 54 publications

Influence of Zn+2 Doping on Ni-Based Nanoferrites; (Ni1−x ZnxFe2O4)

Influence of Zn+2 Doping on Ni-Based Nanoferrites; (Ni1−x ZnxFe2O4)

Influence of divalent metal ion (Zn2+) on magnetic properties, curie temperature and DC electrical properties in Ce3+ substituted Ni-Zn ferrites

Effects of γ-irradiation on AC electrical and impedance spectroscopy of Ni-Zn nano ferrites

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Influence of divalent metal ion (Zn²⁺) on magnetic properties, curie temperature and DC electrical properties in Ce³⁺ substituted Ni-Zn ferrites