Structural, magnetic and dielectric properties of Dy<sup>3+</sup> and Sm<sup>3+</sup> substituted Co–Cu ferrite

Naik, Chandan C.; Salker, A. V.

doi:10.1088/2053-1591/ab0dd0

Cited by 12 publications

(6 citation statements)

References 43 publications

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“…In addition, as shown in Figure 7b, the peaks corresponding to cobalt oxide were observed, and with the first pickling, the Co metallic signal increases considerably. 35,36 It should be noted that as the AAO template is dissolved with NaOH 1M in the present protocol, then, the metallic oxides could be formed at this stage.…”

Section: −E [V] L [μM]mentioning

confidence: 95%

Very Low Potential Electrodeposition of Sm-Co Nanostructures in Aqueous Medium Using Hard Templates

Herrera

Riva

López

et al. 2019

J. Electrochem. Soc.

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Arrays of SmCo nanowires (NW) and nanotubes (NT) with a diameter of 200 nm and different lengths are synthesized by electrodeposition into the nanopores of an alumina membrane. The potential applied during the synthesis largely determines the nanostructure morphology, its crystallinity and composition. Potentials investigated are between −0.8 V and −3.0 V; in the potential range between −0.8 V and 1.0 V, long and perfectly ordered nanowires are obtained with a composition close to that of the equilibrium Sm 2 Co 17 phase in the binary alloy. For higher potentials, above −1 V, samples are nanotubes, 195 nm in external diameter and wall thickness of 30 nm with an equiatomical composition. Magnetic characterization reveals that all the nanostructures are soft ferromagnetic, with coercivity values below 60 mT. From the angular dependence of coercivity and the relative remanence it may concluded that in both, nanowires and nanotubes the magnetization reversal mechanism undergoes a transition from one at smaller angles, involving localized nucleation by curling, and further expansion of vortex-like domain walls. At higher angles, where the applied field is almost perpendicular to the NW/NT long axis, the mechanism changes to one involving nucleation by localized coherent rotation and further expansion of transverse Bloch-like walls.

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Section: −E [V] L [μM]mentioning

confidence: 95%

Very Low Potential Electrodeposition of Sm-Co Nanostructures in Aqueous Medium Using Hard Templates

Herrera

Riva

López

et al. 2019

J. Electrochem. Soc.

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“…In addition, as the energy required for rare earth elements to enter the spinel lattice is different, the reason for the decrease of grain size in rare-earth-doped samples is that the energy needed for RE 3+ to enter in the lattice and form RE 3+ -O 2 bonds is greater than the energy that Fe 3+ enters the lattice and forms Fe 3+ -O 2 bonds. The energy required for crystallization is consumed in the combination of rare earth and oxygen ions [32]. Therefore, the ferrite doped with rare earth elements needs a higher temperature to maintain the nucleation and grain growth.…”

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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“…Study of ferrites usually in most cases has been limited to their structural, electrical and magnetic properties [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. However, study of mechanical properties of ferrites has scientific importance due to their potential applications in industry and in research field.…”

Section: Introductionmentioning

confidence: 99%

“…The physical properties can be altered by introducing the different metallic ions results the cations distribution modification on the A-and B-sites. The factors that determine cation distributions are ionic radius, charge, site preference and level of substituent ion, methods, conditions and sintering temperature for the preparation of ferrites [19][20][21][22].Study of ferrites usually in most cases has been limited to their structural, electrical and magnetic properties [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. However, study of mechanical properties of ferrites has scientific importance due to their potential applications in industry and in research field.…”

mentioning

confidence: 99%

Mechanical behavior, enhanced dc resistivity, energy band gap and high temperature magnetic properties of Y-substituted Mg–Zn ferrites

Ali

Khan

Hossain

et al. 2020

Mater. Res. Express

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We report the synthesis of Y-substituted Mg-Zn [Mg 0.5 Zn 0.5 Y x Fe 2−x O 4 (0x0.05)] ferrites using conventional standard ceramic technique. The samples were characterized by x-ray diffraction (XRD) analysis, field emission scanning electron microscopy (FESEM), FTIR spectroscopy, UV-Vis spectroscopy and quantum design physical properties measurement system (PPMS). XRD patterns confirm the single phase cubic spinel structure up to x=0.03 and appearance of a secondary phase of YFeO 3 for higher Y contents. FESEM images depict the distribution of grains and EDS spectra confirmed the absence of any unwanted element. Completion of solid state reaction and formation of spinel structure has been revealed from FTIR spectra. The FTIR data along with lattice constant, bulk density and porosity were further used to calculate the stiffness constant (C ij ), elastic constant and Debye temperatures. Mechanical stability of all studied compositions is confirmed from C ij using Born stability conditions. Brittleness and isotropic nature are also confirmed using Poisson's ratio and anisotropy constants, respectively. The enhancement of dc electrical resistivity (10 5 Ω cm to 10 6 Ω cm) with Y content is observed. The energy band gap (increased with Y contents) is found in good agreement with dc electrical resistivity. Ferrimagnetic to paramagnetic phase change has been observed from the field dependent high temperature magnetization curves. The magnetic moments and saturation magnetization were found to be decreased with increasing temperature. The Curie temperature (T c ) has been measured from temperature dependent magnetic moment (M-T) and initial permeability (μ′ i -T) measurements and found to be in good agreement with each other. Decrease in T c with Y content is due to redistribution of cations and weakening of the exchange coupling constant. The magnetic phase transition has been analyzed by Arrott plot and found to have second order phase transition. The dc resistivity endorses the prepared ferrites are suitable for high frequency and high temperature magnetic device applications as well.Mg-Zn ferrite is one of the most used soft ferrites because of its high electrical resistivity, low cost, low dielectric loss, high mechanical hardness and superior environmental stability [13]. Mg-Zn ferrites with higher resistivity (10 6 -10 7 Ω cm) make its suitability in high frequency applications [13]. Most of (∼ 90%) Mg 2+ ions are located on the B-sites and small fraction (∼10%) occupies in the A-sites [14,15]. However, the Zn 2+ ions have a preference to occupy A-sites in the spinel lattice [16,17]. The Fe 3+ ions are distributed on both A-and B-sites [18]. Therefore, the physical properties of the Mg-Zn ferrites are determined by the cations distribution over the A-and B-sites. The physical properties can be altered by introducing the different metallic ions results the cations distribution modification on the A-and B-sites. The factors that determine cation distributions are ionic radius, charge, site preference and le...

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Structural, magnetic and dielectric properties of Dy³⁺ and Sm³⁺ substituted Co–Cu ferrite

Cited by 12 publications

References 43 publications

Very Low Potential Electrodeposition of Sm-Co Nanostructures in Aqueous Medium Using Hard Templates

Very Low Potential Electrodeposition of Sm-Co Nanostructures in Aqueous Medium Using Hard Templates

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

Mechanical behavior, enhanced dc resistivity, energy band gap and high temperature magnetic properties of Y-substituted Mg–Zn ferrites

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Structural, magnetic and dielectric properties of Dy3+ and Sm3+ substituted Co–Cu ferrite

Cited by 12 publications

References 43 publications

Very Low Potential Electrodeposition of Sm-Co Nanostructures in Aqueous Medium Using Hard Templates

Very Low Potential Electrodeposition of Sm-Co Nanostructures in Aqueous Medium Using Hard Templates

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

Mechanical behavior, enhanced dc resistivity, energy band gap and high temperature magnetic properties of Y-substituted Mg–Zn ferrites

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Structural, magnetic and dielectric properties of Dy³⁺ and Sm³⁺ substituted Co–Cu ferrite