The influence of Ga doping on structural magnetic and dielectric properties of NiCr0.2Fe1.8O4 spinel ferrite

Ajmal, Muhammad; Islam, M.U.; Ashraf, Ghulam Abbas; Nazir, Muhammad Aamir; Ghouri, M.I.

doi:10.1016/j.physb.2017.05.044

Cited by 45 publications

(8 citation statements)

References 30 publications

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“…This variation is ascribed to the interfacial space charge polarization impact in the material. 41,42 It can be seen that the loss tangent increases with Ni 2+ substitution. The dielectric loss value is marginally higher for samples with nickel substitution, which is probably due to the more modest grain size of the CNF nanoparticles.…”

Section: Dielectric Analysismentioning

confidence: 98%

Observation of dielectric dispersion and relaxation behavior in Ni²⁺-substituted cobalt ferrite nanoparticles

et al. 2022

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Section: Dielectric Analysismentioning

confidence: 98%

Observation of dielectric dispersion and relaxation behavior in Ni²⁺-substituted cobalt ferrite nanoparticles

et al. 2022

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“…For magnetic materials, in principle, the rare‐earth elements are pretty important compositions. [ 36–43 ] MXenes that contain the rare‐earth elements are thus worth further investigation.…”

Section: Figurementioning

confidence: 99%

Computational Study of a Novel 2D Ferromagnetic Metal: the Ce₂C Monolayer

Zhang

Pan

Yan

et al. 2020

Physica Rapid Research Ltrs

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Ferromagnetic (FM) 2D material is known as a FM film with atomic thickness, which serves as a key component in high density data storage and spintronic devices. [1,2] The realization of a long-range FM order can result in new magnetic applications. However, according to the Mermin-Wagner theorem, [3] magnetic order would be suppressed by thermal fluctuations in 2D systems. The large magnetic anisotropy energy (MAE) is demanded for 2D materials to preserve magnetic stability from thermal fluctuations. [4-9] Therefore, pursuing 2D FM materials holding large MAE is one of the key researches in the field of magnetic materials for the magnetic memory and storage devices. [10-13] Recently, a new family of 2D early transition metal carbides and nitrides with MXene-like layer structures has attracted a lot of attention due to their potential applications in nanoscience. For example, Be 2 C, [14] Nb 2 C, [15] Mo 2 C, [16] Al 2 C, [17] and Ta 2 C [15] may be used in the electronics or superconductivity; V 2 C [18] has a potential application in electrode materials; Ti 2 C [19,20] may be used in electrochemical energy storage; Mo 2 C [21] can be applied as thermoelectric materials; Ta 2 C [22,23] have high-temperature applications and higher oxidation resistance; Cu 2 Si can be used in fundamental science and gas sensing. [24-26] And especially, Mn 2 C, [13] Cr 2 C, [27] Fe 2 Si, [28] N 2 Y, [29] Fe 2 C, [30] MnB, [31] Cr 2 N, [32] Ni 2 N, [33] Zr 2 Si, [34] and Ti 2 B [35] have been predicted to have intrinsic magnetism for the potential applications in nanospintronics. It is clear that those researches mostly take focus on the transition metal elements, whereas the rare-earth elements have been studied rarely. For magnetic materials, in principle, the rare-earth elements are pretty important compositions. [36-43] MXenes that contain the rareearth elements are thus worth further investigation. In this work, based on comprehensive density functional theory (DFT) calculations, we predict an intrinsic metallic ferromagnet in the family of MXenes, namely, Ce 2 C monolayer. The 2D Ce 2 C crystal has a Ce─C─Ce sandwiched layered structure, which shares the same configuration as the 1T-MoS 2 sheet. The ab initio molecular dynamics (AIMD) simulations and phonon dispersions indicate that Ce 2 C has an excellent stability. Our computation suggests that Ce 2 C is an FM metal with an estimated Curie temperature (T c) up to 72 K and a large spin-orbit coupling (SOC) effect. The MAE of 2D Ce 2 C crystal is larger than those of pure metal, such as Fe, Co, and Ni. These advantages make the 2D Ce 2 C sheet a very promising candidate for spintronic nanodevices. All the calculations were performed under the framework of DFT as implemented in the Vienna ab initio simulation package (VASP). [44-47] The Perdew-Burke-Ernzerhof (PBE) [48] exchange-correlation functional and the projector augmented plane wave (PAW) [49] pseudopotential were adopted in this article to describe the electron-electron and ion-electron interactions. An energy cutoff of...

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“…The sol-gel technique is the utmost adaptable process to produce synthetic nanoparticles of spinel ferrites and having uncountable benefits over other synthesis methods for instance; requires low temperature, ecofriendly, desired nanoarchitecture, chemically stable product formation with desired morphology through modification of synthesis environments and parameters [22][23][24]. The doping of variability of divalent, trivalent and tetravalent cations (Mg 2+ , Zn 2+ , Cd 2+ , Cu 2+ , Cr 3+ , Ga 3+ , Zr 4+ , Sn 4+ , Ti 4+ ) with different molar compositions are another crucial factor that has an effect on physico-chemical properties of spinel ferrite nanoparticles [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Sol–gel auto-ignition fabrication of Gd3+ incorporated Ni0.5Co0.5Fe2O4 multifunctional spinel ferrite nanocrystals and its impact on structural, optical and magnetic properties

Pawar¹,

Khirade

Vinayak³

et al. 2020

SN Appl. Sci.

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Monophasic nanocrystals of rare earth gadolinium (Gd 3+) ion doped nickel-cobalt ferrite, Ni 0.5 Co 0.5 Gd y Fe 2−y O 4 (y = 0.00, 0.025, 0.050, 0.075, 0.100 and 0.125) have been synthesized by l-ascorbic acid assisted sol-gel auto-ignition process. Thermogravimetric and differential scanning calorimetry, X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) with selected area electron diffraction (SAED) patterns, ultraviolet-visible spectrophotometry and vibrating sample magnetometer were employed to characterize the microstructure, optical and magnetic properties. Structural investigations verified the presence of cubic spinel phase short of any contamination peak. The average crystallite size was seen in nano-regime dimensions and well confirmed by TEM results. SAED patterns showed bright and intense ring of (311) plane revealed the establishment of spinel ferrite nanocrystals. Lattice constant (a) increases steadily with the rise in Gd 3+ content following the Vegard's law. FTIR spectra confirmed the creation of spinel ferrite structural geometry. Saturation magnetization (M s) and a remanence magnetization (M r) decreased from 29.77 to 20.78 emu/g and 21.62 to 15.79 emu/g, respectively, with increasing the Gd 3+ content. However, coercivity (H c) is significantly increased. The highest value of H c = 1132 Oe was found for y = 0.075 sample. The reduction in M s values can be justified owing to the replacement of Fe 3+ existing at the octahedral [B]-sites by the Gd 3+ ions which is paramagnetic at room temperature. The elucidation of magnetic parameters with Gd 3+ doping was attributed to the discrepancy of anisotropy constant, the paramagnetic nature of Gd 3+ and crystallite size effect.

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The influence of Ga doping on structural magnetic and dielectric properties of NiCr0.2Fe1.8O4 spinel ferrite

Cited by 45 publications

References 30 publications

Observation of dielectric dispersion and relaxation behavior in Ni²⁺-substituted cobalt ferrite nanoparticles

Observation of dielectric dispersion and relaxation behavior in Ni²⁺-substituted cobalt ferrite nanoparticles

Computational Study of a Novel 2D Ferromagnetic Metal: the Ce₂C Monolayer

Sol–gel auto-ignition fabrication of Gd3+ incorporated Ni0.5Co0.5Fe2O4 multifunctional spinel ferrite nanocrystals and its impact on structural, optical and magnetic properties

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The influence of Ga doping on structural magnetic and dielectric properties of NiCr0.2Fe1.8O4 spinel ferrite

Cited by 45 publications

References 30 publications

Observation of dielectric dispersion and relaxation behavior in Ni2+-substituted cobalt ferrite nanoparticles

Observation of dielectric dispersion and relaxation behavior in Ni2+-substituted cobalt ferrite nanoparticles

Computational Study of a Novel 2D Ferromagnetic Metal: the Ce2C Monolayer

Sol–gel auto-ignition fabrication of Gd3+ incorporated Ni0.5Co0.5Fe2O4 multifunctional spinel ferrite nanocrystals and its impact on structural, optical and magnetic properties

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Observation of dielectric dispersion and relaxation behavior in Ni²⁺-substituted cobalt ferrite nanoparticles

Observation of dielectric dispersion and relaxation behavior in Ni²⁺-substituted cobalt ferrite nanoparticles

Computational Study of a Novel 2D Ferromagnetic Metal: the Ce₂C Monolayer