Role of Nature of Rare Earth Ion Dopants on Structural, Spectral, and Magnetic Properties in Spinel Ferrites

Ikram, Salma; Ashraf, Fouzia; Alzaid, Meshal; Mahmood, K.; Amin, Nasir; Haider, Sajjad

doi:10.1007/s10948-020-05723-8

Cited by 22 publications

(10 citation statements)

References 26 publications

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“…After further increasing the rare earth concentration, the rare-earth ions will no longer dissolve in the spinel lattice and begin to diffuse to the grain boundary. They form an ultra-thin layer around the grain boundary, cause stress on the grain boundary, and reduce the grain size and lattice parameters [30]. When Sc 3+ and Gd 3+ ions are doped into Ni-Zn ferrite, more energy is needed in the mass transfer process, which hinders the growth of ferrite grains.…”

Section: Xrd Analysismentioning

confidence: 99%

Structure and magnetic properties of coprecipitated nickel-zinc ferrite-doped rare earth elements of Sc, Dy, and Gd

Pan

Gao

et al. 2021

J Mater Sci: Mater Electron

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This research is the basic study of temperature-sensitive ferrite characteristics prepared by coprecipitation with doping different typical sizes of rare earth elements. Ni 0.5 Zn 0.5 Re x Fe 2-x O 4 (NZRF) (X = 0.02, 0.05, 0.07 and 0.09) nanoparticles (NPs) doped by Sc, Dy and Gd prepared by chemical coprecipitation method. The structure and properties of Ni 0.5 Zn 0.5 Re x Fe 2-x O 4 were analyzed by various characterization methods. XRD results show that the grain size of Ni 0.5 Zn 0.5 Re x Fe 2-x O 4 is from 10.6 to 12.4 nm, which is close to the average grain size of 13.9 nm observed on TEM images. It is also found that the ferrite particles are spherical and slightly agglomerated in TEM images. FTIR measurements between 400 and 4000 cm -1 have con rmed the intrinsic cation vibration of the spinel structure. The concentrations of nickel, zinc, iron, and rare earth elements have been determined by ICP-AES, and all ions have participated in the reaction. The magnetic properties of Sc, Dy, and Gd 3+ doped NZRF NPs at room temperature are recorded by a physical property measurement system (PPMS-9). It is found that the magnetization can be changed by adding rare-earth ions. When X = 0.07, Gd 3+ doped Ni 0.5 Zn 0.5 Fe 2 O 4 (NZF) exhibits the highest saturation magnetization. The magnetic properties of NZGd 0.07 vary the most with temperature. The thermomagnetic coe cient of NZGd 0.07 nanoparticles stabilized to 0.18 emu/gK at 0-100℃. Hence, NZGd 0.07 with low Curie temperature and the high thermomagnetic coe cient can be used to prepare temperature-sensitive ferro uid. All the samples exhibit very small coercivity and almost zero remanences, which indicates the superparamagnetism of the synthesized nanoparticles.

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Section: Xrd Analysismentioning

confidence: 99%

Structure and magnetic properties of coprecipitated nickel-zinc ferrite-doped rare earth elements of Sc, Dy, and Gd

Pan

Gao

et al. 2021

J Mater Sci: Mater Electron

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“…37,38 It has been reported in the literature that crystallite sizes tend to decrease with decreasing ionic radius of doping ions. 39…”

Section: Resultsmentioning

confidence: 99%

“…37,38 It has been reported in the literature that crystallite sizes tend to decrease with decreasing ionic radius of doping ions. 39 The following equation was used to determine the change in percent crystallinity of semicrystalline PEDOT:PSS thin film with doping materials: 40 Percent crystallinity ¼…”

Section: Structural Analysismentioning

confidence: 99%

Facile and single step produced Ba:Sn-codoped PEDOT:PSS thin film electrode with improved optics and electrochemical properties for transparent and flexible supercapacitor applications

2022

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“…Parry et al 16 explored the utilization of cerium-substituted magnesium ferrite in hydroelectric cell applications. The study found that the Ce-based hydroelectric cells produced maximum offload currents of 5.2 mA and 8.4 mA for Ce x MgFe 2−x O 4 and Ce x MgFe 2−x O 4 cells, respectively, with open circuit voltages of 0.86 V and 0.76 V. Ikram et al 17 investigated the impact of the ionic radii of different rare Earth ions on the magnetic properties of spinel ferrites with the formula MFe 2−y RE y O4, and they found a direct correlation between magnetization and ionic radius. Moreover, other researchers have observed the change in ferrites' structural, magnetic, electrical, and dielectric properties with the rare Earth elements substitution.…”

mentioning

confidence: 96%

Impact of Process Parameters and Dopant Concentration on Structural, Magnetic, and Dielectric Properties of Dysprosium-doped Nickel-Zinc Ferrites Synthesized by Microwave Hydrothermal Method

Ramesh,

Usha,

Neelima

et al. 2023

ECS J. Solid State Sci. Technol.

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This study aims to investigate the impact of substituting Dy3+ ions on the structural, magnetic and dielectric properties of Nickel Zinc (Ni-Zn) ferrites, which have the chemical formula Ni0.5Zn0.5DyxFe2-xO4 (where x = 0, 0.01, 0.03, 0.05, 0.07, and 0.09). These ferrites were synthesized using a microwave hydrothermal technique with different process parameters. Structural characterization of the synthesized powders was carried out using X-ray diffraction (XRD) and Fourier transformation infrared spectroscopy (FTIR). The XRD analysis confirmed the presence of a pure spinel phase for Dy concentrations (x) up to 0.05. However, when x ≥ 0.07, an additional orthoferrite phase (DyFeO3) was observed along with the spinel phase. FTIR spectra revealed a shift in low-frequency wave numbers due to Dy3+ ion substitution. The size and morphology of the synthesized powder particles were examined using field emission scanning electron microscopy (FESEM). The powder compacts were sintered using microwave processing at 900 °C for 40 min. The increase in dc. resistivity is observed with an increase in Dy3+ concentration, mainly due to the change in the hopping mechanism with the substitution concentration. Dielectric properties such as dielectric constant and loss are measured in the frequency range of 100 Hz to 1.8 GHz. The high value of dielectric constant and loss observed in the low-frequency region compared to the high-frequency region. Maxwell’s Wagner model and ‘Koop’s theory explains the variation in dielectric properties with the frequency. The magnetic hysteresis loops were measured at different temperatures and observed to enhance the low-temperature magnetic properties compared to room temperature. The results suggest that the magnetic and dielectric properties of the investigated samples can be adjusted by varying the concentration of Dy3+ ions, providing the ability to tailor these properties according to specific application requirements.

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Role of Nature of Rare Earth Ion Dopants on Structural, Spectral, and Magnetic Properties in Spinel Ferrites

Cited by 22 publications

References 26 publications

Structure and magnetic properties of coprecipitated nickel-zinc ferrite-doped rare earth elements of Sc, Dy, and Gd

Structure and magnetic properties of coprecipitated nickel-zinc ferrite-doped rare earth elements of Sc, Dy, and Gd

Facile and single step produced Ba:Sn-codoped PEDOT:PSS thin film electrode with improved optics and electrochemical properties for transparent and flexible supercapacitor applications

Impact of Process Parameters and Dopant Concentration on Structural, Magnetic, and Dielectric Properties of Dysprosium-doped Nickel-Zinc Ferrites Synthesized by Microwave Hydrothermal Method

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