Nanograin Mn–Zn ferrite smart cores to miniaturize electronic devices

Waqas, Hassan; Qureshi, A. H.; Subhan, K.; Shahzad, M.I.

doi:10.1016/j.ceramint.2011.08.054

Cited by 34 publications

(17 citation statements)

References 29 publications

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“…However, some peaks of the α-Fe 2 O 3 phase can also be observed at 2θ = 33.08 • , 41.02 • , and 54.11 • in each diffraction pattern. The formation of a small fraction of the α-Fe 2 O 3 phase was mainly due to the partial oxidation of spinel CoFe 2 O 4 and Mn-Co ferrites [25]. During the combustion process, conventional oxidation and formation of spinel CoFe 2 O 4 and Co-Mn ferrite are very common.…”

Section: Structural Analysismentioning

confidence: 99%

“…cations in spinel ferrites changes their optical, magnetic, and catalytic properties [21], due to the distribution of the cations in between the available A-and B-sites [22]. Several cations have been used as substituent by many researchers in order to improve the electrical and magnetic properties of spinel ferrites [23][24][25]. However, a detailed study on the optical and catalytic properties of Mn 2+ -doped CoFe 2 O 4 nanoparticles has not yet been reported so far.…”

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confidence: 91%

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Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

Manikandan

Durka²,

Antony

2015

J Supercond Nov Magn

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Spinel Mn x Co 1−x Fe 2 O 4 ; x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) nanoparticles were synthesized by ureaassisted auto combustion method using nitrates of Co, Mn and Fe as the starting materials and urea as the fuel. X-ray diffraction (XRD) analysis showed that all composition was found to have a cubic spinel structure. The average crystallite size of the samples was estimated using the Debye-Scherrer formula and was found to be in the range of 22.62 and 36.45 nm. The lattice parameter increased from 8.432 to 8.457Å with increasing the Mn 2+ content, which was determined by Rietveld analysis. High-resolution scanning electron microscopy (HR-SEM) and high-resolution transmission electron microscopy (HR-TEM) analyses were used to study the morphological variation, and the results showed a nanosized particlelike morphology. Energy-dispersive X-ray (EDX) results showed that the composition of the elements was relevant as expected from the synthesis. The bandgap energy of the pure CoFe 2 O 4 was estimated to be 2.33 eV from UV-visible diffuse reflectance spectroscopy (DRS). With the increase of Mn 2+ ion, the bandgap energy increased from 2.35 to 2.42 eV. The magnetic properties of the A. Manikandan ( ) · S. samples were investigated at room temperature by using a vibrating sample magnetometer (VSM). The magnetic hysteresis (M-H) loop confirmed the superparamagnetic nature of pure CoFe 2 O 4 and a weak ferromagnetic behavior of Mn 2+ doped CoFe 2 O 4 samples with specific saturation magnetization in the range of 55.16 ± 24 and 66.92 ± 05 emu/g. All compositions of spinel Mn x Co 1−x Fe 2 O 4 samples were successfully tested as catalyst for the conversion of benzyl alcohol, which has resulted in 62.75 and 92.62 % conversion efficiency of CoFe 2 O 4 and Mn 0.5 Co 0.5 Fe 2 O 4 , respectively.

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Section: Structural Analysismentioning

confidence: 99%

mentioning

confidence: 91%

Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

Manikandan

Durka²,

Antony

2015

J Supercond Nov Magn

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show abstract

“…Metal nitrates, aqueous ammonia, citric acid, and demineralized water (DMW) were the main ingredients of this method; the detailed procedure of synthesized compositions by auto-combustion process has been described by authors elsewhere [19,20]. Nanosized Mn-Zn ferrite powder [(20 ± 5) nm] obtained by this process was calcined at 450°C in air to eliminate unwanted species.…”

Section: Methodsmentioning

confidence: 99%

“…Electromagnetic properties such as initial permeability and impedance were measured using precision impedance analyzer (Agilent-4294A) having magnetic test fixture (Model-16454A). Gain response of sintered cores (toroids) was measured by laboratory built electronic circuit [20].…”

Section: Methodsmentioning

confidence: 99%

Effect of Firing Temperature on the Electromagnetic Properties of Electronic Transformer Cores Developed by Using Nanosized Mn–Zn Ferrite Powders

Waqas

Qureshi

Shahzad

2014

Acta Metall. Sin. (Engl. Lett.)

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Current investigation deals with the effect of grain growth process as a function of sintering temperature on the electromagnetic properties (initial permeability, impedance, and gain) of Mn-Zn ferrite (MZF) cores (toroids). By employing auto combustion process, nanosized [(20 ± 5) nm] MZF powders were synthesized and toroid shape cores were obtained after subsequent calcination and firing (sintering) process. It was observed that the submicron structure (0.5 lm) achieved in the ferrite core sintered at 1,000°C was gradually transformed into micron size grains by increasing the firing temperature i.e., 1,100, 1,200, and 1,350°C. The results reveal that MZF core sintered at low temperature (1,000°C) showed high impedance, low initial permeability, and narrow working frequency range i.e., 3-15 MHz. However, the improvement in initial permeability, sintered density, and operational frequency range (100 kHz-17 MHz) was observed at high temperature (1,350°C) firing in the inert environment. This synthesized MZF core is more suitable for miniaturized switch mode power supply applications.

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“…Com isso, estão situadas na classe dos materiais magnéticos, como apropriado para vários tipos de aplicações nas áreas de eletrônica, para supressão de interferência eletromagnética (EMI) e armazenamento de dados [1], e também em aplicações biomédicas, como a entrega de drogas específicas, hipertermia e como agentes de contraste em imagens de ressonância magnética (MRI) [2][3][4]. Além disso, as nanopartículas de ferritas Mn-Zn são também utilizadas na modalidade de neuroproteção ocular em aplicações clínicas de glaucoma [5].…”

Section: Introductionunclassified

Influência do teor de Zn2+ nas características morfológicas e magnéticas de ferritas Mn1-xZnxFe2O4 sintetizados em grande escala por reação de combustão

et al. 2017

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Resumo Este trabalho teve como objetivo avaliar a influência do Zn2+ nas características morfológicas e magnéticas de ferritas Mn1-xZnxFe2O4 (onde x= 0,0, 0,35, 0,5 e 0,65 em mol de Zn) sintetizadas por reação de combustão em escala piloto com bateladas de 200 g/reação. As amostras foram caracterizadas por difração de raios X, microscopia eletrônica de varredura/transmissão e medidas magnéticas. Os resultados indicaram que todas as composições de ferritas foram monofásicas; morfologicamente a adição de Zn ao sistema MnFe2O4 causou leve redução no tamanho dos aglomerados e redução no tamanho das partículas, mas esse comportamento não foi linear com o teor de Zn2+. As amostras apresentaram comportamento magnético característico de materiais magnéticos moles, com magnetização de saturação máxima de 62 emu/g para a amostra com menor teor de zinco em sua composição.

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Nanograin Mn–Zn ferrite smart cores to miniaturize electronic devices

Cited by 34 publications

References 29 publications

Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

Effect of Firing Temperature on the Electromagnetic Properties of Electronic Transformer Cores Developed by Using Nanosized Mn–Zn Ferrite Powders

Influência do teor de Zn2+ nas características morfológicas e magnéticas de ferritas Mn1-xZnxFe2O4 sintetizados em grande escala por reação de combustão

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