Influence of rare earth ion doping (Ce and Dy) on electrical and magnetic properties of cobalt ferrites

Hashim, Mohd.; Raghasudha, M.; Meena, Sher Singh; Shah, Jyoti; Shirsath, Sagar E.; Kumar, Shalendra; Ravinder, D.; Bhatt, Pramod; Alimuddin, Alimuddin; Kumar, Ravi

doi:10.1016/j.jmmm.2017.10.023

Cited by 151 publications

(25 citation statements)

References 31 publications

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“…The average crystallite size was calculated to be 56 nm indicating the presence of broad peak in XRD pattern (inset Fig.1.). The detailed structural parameters of Ce and Dy doped CoFe 2 O 4 have already described in our previous work [10]. Fig.1d.…”

Section: Fig1a Represents Xrd Pattern Of Single Phase Cubic Spinelmentioning

confidence: 93%

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Superparamagnetic and photocatalytic activity of CoCe0.02Dy0.02Fe1.96O4 nanoparticles synthesized by citrate-gel autocombustion technique

2019

Biointerface Res Appl Chem

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Mitigating organic pollutants by employing semiconducting materials is considered to be green and sustainable route to tackle the environmental problems. Herein, citrate-gel autocombustion method was adopted to synthesize Ce and Dy doped CoFe2O4 and characterized by various analytical techniques. The efficacy of prepared CoCexDyxFe2-2xO4 (x=0-0.04) samples were tested for degradation of Methylene blue (MB) under visible light irradiation. The photocatalytic efficiency of CoCe0.02Dy0.02Fe1.96O4 for degradation of MB was found to be larger than pure CoFe2O4, Degussa P25 and other modified CoFe2O4. The enhanced photocatalytic activity was attributed to improved charge separation and visible light utilization by Ce and Dy into CoFe2O4 system. The super-spin glass behaviour of CoCexDyxFe2-2xO4 confirmed from flat nature of magnetization of FC curve below TB.

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Section: Fig1a Represents Xrd Pattern Of Single Phase Cubic Spinelmentioning

confidence: 93%

“…Methylene blue was used as a model pollutant to evaluate the efficiency of the prepared Ce and Dy doped cobalt ferrites through the citrate-gel auto-combustion method [10]. The photocatalytic activity of the prepared samples was investigated by studying the decomposition of MB under visible light irradiation.…”

Section: Photocatalytic Experimentmentioning

confidence: 99%

Superparamagnetic and photocatalytic activity of CoCe0.02Dy0.02Fe1.96O4 nanoparticles synthesized by citrate-gel autocombustion technique

2019

Biointerface Res Appl Chem

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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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“…CoFe 2 O 4 found its application in many fields including energy conversion and storage, magnetic recording and high-density digital recording disks, gas sensing, catalysis, biotechnology, magnetic bulk cores, and microwave absorbers [ 6 , 7 ]. It has also found use in biomedical applications such as magnetic thermo-drug delivery, hyperthermia, biosensors, and magnetic resonance imaging [ 8 , 9 , 10 , 11 ]. Besides Co 2+ , various other metallic cations such as Ni 2+ , Cu 2+ , Zn 2+ , Mg 2+ , Mn 2+ , have been partially or even totally introduced into the ferritic structure (M 2+ Fe 2 O 4 ), resulting in nanoparticles with specific morphology and properties [ 12 , 13 , 14 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Novel Polyimide/Copper-Nickel Ferrite Composites with Tunable Magnetic and Dielectric Properties

Hamciuc¹,

Asăndulesa²,

Hamciuc³

et al. 2021

Polymers

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Heat-resistant magnetic polymer composites were prepared by incorporating cerium-doped copper-nickel ferrite particles, having the general formula Ni1-xCuxFe1.92Ce0.08O4 (x: 0.0, 0.3, 0.6, 1.0), into a polyimide matrix. The effects of particle type and concentration on the thermal, magnetic, and electrical properties of the resulting composites were investigated. The samples were characterized by FTIR, scanning electron microscopy, X-ray diffractometry, thermogravimetric analysis, differential scanning calorimetry, vibrating sample magnetometer, and broadband dielectric spectroscopy. The composites exhibited high thermal stability, having initial decomposition temperatures between 495 and 509 °C. Saturation magnetization (Ms), magnetic remanence (Mr), and coercivity (Hc) were found in range of 2.37–10.90 emu g−1, 0.45–2.84 emu g−1, and 32–244 Oe, respectively. The study of dielectric properties revealed dielectric constant values of 3.0–4.3 and low dielectric losses of 0.016–0.197 at room temperature and a frequency of 1 Hz.

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Influence of rare earth ion doping (Ce and Dy) on electrical and magnetic properties of cobalt ferrites

Cited by 151 publications

References 31 publications

Superparamagnetic and photocatalytic activity of CoCe0.02Dy0.02Fe1.96O4 nanoparticles synthesized by citrate-gel autocombustion technique

Superparamagnetic and photocatalytic activity of CoCe0.02Dy0.02Fe1.96O4 nanoparticles synthesized by citrate-gel autocombustion technique

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

Novel Polyimide/Copper-Nickel Ferrite Composites with Tunable Magnetic and Dielectric Properties

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Influence of rare earth ion doping (Ce and Dy) on electrical and magnetic properties of cobalt ferrites

Cited by 151 publications

References 31 publications

Superparamagnetic and photocatalytic activity of CoCe0.02Dy0.02Fe1.96O4 nanoparticles synthesized by citrate-gel autocombustion technique

Superparamagnetic and photocatalytic activity of CoCe0.02Dy0.02Fe1.96O4 nanoparticles synthesized by citrate-gel autocombustion technique

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

Novel Polyimide/Copper-Nickel Ferrite Composites with Tunable Magnetic and Dielectric Properties

Contact Info

Product

Resources

About

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