Si–Ca species modification and microwave sintering for NiZn ferrites

Yang, Yin-Ju; Sheu, Ching-Iuan; Cheng, Syh-Yuh; Chang, Horng‐Yi

doi:10.1016/j.jmmm.2004.06.040

Cited by 21 publications

(3 citation statements)

References 19 publications

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“…Due to the solubility limit, the Nd 3+ ions are partially replaced by Fe 3+ ions, and the excess Nd 3+ ions aggregate at the grain boundaries, forming secondary phases. 19,20 The Scherrer formula was used to calculate the average crystallite size of the obtained samples: Table I. Structural parameters of the prepared Nd 3+ doped cobalt-cadmium ferrites.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 7, shows that the observed Raman peaks at 191, 291, 461, 591 and 671 cm −1 are assigned to the vibrational modes T2g(3), Eg, T2g(2), A1g(2) and A1g(1) in the crystal lattice. 19 The Raman peak at 190 cm −1 corresponds to the bending mode of octahedral oxygen, while the peak at 290 cm −1 corresponds to the stretching modes of the C-O bond shown in Table II. The peak at 460 cm −1 corresponds to the Fe-O bond, while the peak at 560 cm −1 corresponds to the bending mode of this bond.…”

Section: Resultsmentioning

confidence: 99%

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Retracted: Rare Earth Nd³⁺ Doping Cobalt-Cadmium Nanoferrites Structural, Optical, and Magnetic Properties and Applications

Kumar

2024

ECS J. Solid State Sci. Technol.

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Nanoscale particles of neodymium-substituted cobalt-cadmium generic formula for nanoferrite Co0.4Cd0.6NdxFe2−xO4 samples at X = 0.000, 0.003, 0.005, 0.007, 0.009, and 0.011 were studied. The prepared powders were synthesised at low temperatures using citrate gel auto-combustion process. The synthesised powders were calcined at 500 °C for four hours. The morphological properties of the sintered powders were investigated, and their crystal structure was determined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD peaks confirmed the spinel ferrite structure. The lattice parameter was calculated from the XRD and showed decreasing trends with 8.442 to 8.308. SEM revealed an irregularly-shaped grain morphology with a homogeneous distribution. Raman spectroscopy analysis showed slight frequency changes in the Raman modes in doped samples, attributed to variations in the cation distribution. The peaks are located at 191, 291, 461, 591, and 671 cm−1. UV spectroscopy studies showed that the energy band gap values decrease with increasing Nd3+ concentration. Direct optical band gap values obtained were 1.238, 1.248, 1.199, 1.135, 1.134, and 1.101 eV with increasing Nd doping. The magnetic hysteresis properties were determined using a SQUID-VSM magnetometer. The hysteresis curves of Co0.4Cd0.6NdxFe2−xO4 nanoparticles show an increase in coercivity with increasing doping concentration. This enhancement is attributed to the multi-domain behaviour.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Retracted: Rare Earth Nd³⁺ Doping Cobalt-Cadmium Nanoferrites Structural, Optical, and Magnetic Properties and Applications

Kumar

2024

ECS J. Solid State Sci. Technol.

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“…Many researchers have successfully synthesized Ni [24], Ni-Zn [17,25] and Ni-Cu-Zn [14,[26][27][28] ferrites by employing the microwave sintering technique and studied their magnetic and electrical properties. In the present work, the authors aimed to study the effect of composition and sintering temperature on initial permeability as a function of frequency and temperature for Ni 1-x Zn x Fe 2 O 4 (x00.2, 0.3, 0.4 and 0.5) system prepared by microwave sintering technique.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of Ni-Zn ferrites prepared by microwave sintering method

et al. 2011

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The effect of zinc ion substitution for nickel on structural and magnetic properties of NiZn ferrites is reported. The spinel ferrite system Ni 1-x Zn x Fe 2 O 4 with x0 0.2, 0.3, 0.4 and 0.5 was prepared by microwave sintering method. The uniaxially pressed samples were sintered at various temperatures such as 900°C, 1000°C and 1100°C for 30 min. X-ray diffraction patterns of the samples indicate the formation of single-phase cubic spinel structure. SEM micrographs show that grain size increases with increasing zinc content and sintering temperature. The elemental composition of these ferrites was analyzed by EDS. Lattice constant increases with increase in zinc content, obeying Vegard's law. The effect of composition and sintering temperature on initial permeability as the function of frequency and temperature was studied. The initial permeability of NiZn ferrite increases greatly with increasing Zn content and sintering temperature. The dependence of initial permeability with respect to temperature shows the decrease in the Curie point with increase in zinc content, is the normal behavior of ferrites. The relative loss factor ðtan d μ i = Þ of the order of 10 −2 to 10 −5 in the frequency range from 100 Hz to 1 MHz indicates that the prepared ferrites have relatively high purity.

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Effect of Substitutions of Zn for Mn on Size and Magnetic Properties of Mn–Zn Ferrite Nanoparticles

Amirabadizadeh

Farsi

Dehghani

et al. 2011

J Supercond Nov Magn

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Si–Ca species modification and microwave sintering for NiZn ferrites

Cited by 21 publications

References 19 publications

Retracted: Rare Earth Nd³⁺ Doping Cobalt-Cadmium Nanoferrites Structural, Optical, and Magnetic Properties and Applications

Retracted: Rare Earth Nd³⁺ Doping Cobalt-Cadmium Nanoferrites Structural, Optical, and Magnetic Properties and Applications

Magnetic properties of Ni-Zn ferrites prepared by microwave sintering method

Effect of Substitutions of Zn for Mn on Size and Magnetic Properties of Mn–Zn Ferrite Nanoparticles

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Si–Ca species modification and microwave sintering for NiZn ferrites

Cited by 21 publications

References 19 publications

Retracted: Rare Earth Nd3+ Doping Cobalt-Cadmium Nanoferrites Structural, Optical, and Magnetic Properties and Applications

Retracted: Rare Earth Nd3+ Doping Cobalt-Cadmium Nanoferrites Structural, Optical, and Magnetic Properties and Applications

Magnetic properties of Ni-Zn ferrites prepared by microwave sintering method

Effect of Substitutions of Zn for Mn on Size and Magnetic Properties of Mn–Zn Ferrite Nanoparticles

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Retracted: Rare Earth Nd³⁺ Doping Cobalt-Cadmium Nanoferrites Structural, Optical, and Magnetic Properties and Applications

Retracted: Rare Earth Nd³⁺ Doping Cobalt-Cadmium Nanoferrites Structural, Optical, and Magnetic Properties and Applications