Synthesis, structure and electromagnetic properties of Mn–Zn ferrite by sol–gel combustion technique

Wang, Wenjie; Zang, Chongguang; Jiao, Qingze

doi:10.1016/j.jmmm.2013.08.057

Cited by 50 publications

(19 citation statements)

References 26 publications

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Section: Resultssupporting

confidence: 90%

“…It also can be seen that the appearance of secondary phase of α-Fe 2 O 3 marked with asterisk (*) accompanying with the Mn-Zn ferrite phase, which is obvious in sol-gel combustion synthesis method. With enhance content of Zn 2+ in Mn-Zn nano ferrites the secondary phase of α-Fe 2 O 3 tends to increase consistent with earlier reported data [6,7].Synchrotron and lab x-ray diffraction confirms that mixed Mn-Zn nano ferrites form face centred cubic structure with Fd3m space group. The crystallite size is evaluated using Scherer's equation.…”

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confidence: 89%

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Structural and Electrical Properties of Low Temperature Fire Mn-Zn Nano Ferrite for High Frequency Application

2017

IJAERD

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Mn-Zn nano ferrites were synthesized with citric acid as a capping agent by sol gel auto combustion method. Synchrotron and laboratory x-ray diffraction confirms that mixed nano ferrites is crystalline in nature and indexed in cubic crystal structure (space group Fd3m). Reduced crystallite size is obtained from Synchrotron (15.4 ± 0.0001 Properties of ferrites are sensitive to their processing conditions such as temperature, composition and microstructure. Ferrites nanoparticles showed unique dielectric properties. Usually, high performance devices require low dielectric loss (tan δ). Lower the tan δ, the higher the efficiency and lower the noise [4]. Keeping this in mind, herein we aimed at synthesizing and characterizing mixed Mn-Zn nanosized ferrites via low temperature synthesis technique. We further report the consistency of evolution of crystal structure, phonon modes and dielectric properties at different temperatures. Experimental DetailsThe sol-gel auto combustion method is used here for synthesis of Mn 0.5 Zn 0.5 Fe 2 O 4 nano ferrites [5]. The starting materials in their stoichiometry as (Mn(NO 3 ) 2 ), (Zn(NO 3 ) 2 ·6H 2 O) and (Fe(NO 3 ) 3 ·9H 2 O) were dissolved in a distilled water. The molar ratio of citric acid to total moles of metal nitrate ions is adjusted at 1:2. The ammonia solution is added to mixed solution to neutralize with a pH ~ 10. The neutralized solution is evaporated to dryness by heating at 120 °C on a hot plate with continuous stirring, until it becomes viscous and finally formed a very viscous gel. The dried gel burnt completely in a self-propagating combustion manner to form a loose powder. The burnt powder was calcined in air at temperature of 800 °C for 8 hour to obtain spinel phase. The powders were pressed into pellets of size 10 mm (diameter) and 1 mm (thickness) by applying a pressure of 8 Tons. The pellets were sintered at 800 C for 8 h.The room temperature Lab x-ray diffraction (XRD) was performed using Cu kα 1 radiation ( = 1.5406 Å) with Bruker D8 advance x-ray powder diffractometer. Also, the Synchrotron x-ray powder diffraction (SXRD) [ = 0.8042 Å] has been performed on the angle dispersive x-ray diffraction (ADXRD) beamline (BL-12) at Indus-2 synchrotron source (2.5 GeV), India. The Wayne Kerr impedance analyzer 6500B is used in the frequency range of 20 Hz to 120 MHz, ac International Journal of Advance Engineering and Research Development (IJAERD)National Conference On Nanomaterials, (NCN-2017), Volume 4, Special Issue 6, Dec 2017 UGC Approved,e-ISSN:2348-4470, p-ISSN:2348 @IJAERD-2017, All rights Reserved 2 voltage range from 10 mV to 1 V and temperature range varies upto 1000 °C. The high purity silver conducting pastecoated pellets of Mn-Zn nano ferrites were used for improved electrical contact for dielectric measurement 3 Result and DiscussionThe typical Lab x-ray diffraction (XRD) and Synchrotron x-ray diffraction (SXRD) pattern of Mn 0.5 Zn 0.5 Fe 2 O 4 nano ferrites sintered at 800 C are shown in Fig. 1. It indicates that the diffraction ...

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Section: Resultssupporting

confidence: 90%

supporting

confidence: 89%

Structural and Electrical Properties of Low Temperature Fire Mn-Zn Nano Ferrite for High Frequency Application

2017

IJAERD

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“…Assim, dentre os vários métodos de síntese propostos para a produção das ferritas Mn-Zn, a técnica de reação de combustão se destaca por ser segura, rápida, possui reprodutibilidade para produção de pós cerâmicos, além de apresentar características interessantes, como custo relativamente baixo, normalmente possibilita a produção de materiais com estrutura e composição desejadas e oferece a possibilidade de obtenção de um produto em grande escala de produção [17][18][19][20]. Com base neste contexto, este trabalho teve como objetivo investigar a influência do Zn 2+ nas características morfológicas e magnéticas de ferritas Mn 1-x Zn x Fe 2 O 4 (0≤x≤0,65) sintetizado em grande escala por reação de combustão.…”

Section: Introductionunclassified

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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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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“…Use of high-frequency ferrites requires attention to several crucial issues. In addition to the basic host composition, powder synthesis, forming method, and sintering process [6][7][8][9], additives also play an important role to help tailor the magnetic properties as they could dissolve into the grains, segregate to the grain boundaries to enhance grain boundary resistivity, and alter the microstructural evolution of the ferrites [2,10].…”

Section: Introductionmentioning

confidence: 99%

Effects of Nb2O5, TiO2, SiO2, and CaO additions on the loss characteristics of Mn-Zn Ferrite

Wang¹,

Hsu²,

Chen³

2014

J Electroceram

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The effects of SiO 2 , CaO, TiO 2 , and Nb 2 O 5 additives on the high-frequency magnetic properties of the Mn 0.3 Zn 0.7 Fe 2 O 4 (MZFT) ferrites were examined in this study. The content of SiO 2 and CaO was kept at 50 ppm and 500 ppm, while that of TiO 2 and Nb 2 O 5 varied respectively from 0 to 3000 ppm and from 0 to 300 ppm. All samples surpassed 95 % theoretical density after sintering at 1300°C with N3T30 composition (50 ppm SiO 2 , 5000 ppm CaO, 3000 ppm TiO 2 , and 300 ppm Nb 2 O 5 ) reporting the highest sintered density. The calculated lattice constants of the ferrites evaluated appeared to be nearly the same (≈0.849 Å) and no second phase was present. It was apparent that the additions of SiO 2 , CaO, TiO 2 , and Nb 2 O 5 exerted no notable impact on the microstructures of the ferrites. The average grain size of the samples sintered at 1300°C ranged from 7.78 μm to 9.76 μm with both intergranular and intragranular pores. Incorporation of partial Ti 4+ and Nb 5+ ions into the lattices shifted the secondary maximum peak of the μ i -T curves from 90°C to lower temperatures (60 to 70°C). The initial permeability of the ferrites was strongly dependent on the additives and the sintering temperature. The initial permeability of the MZFT sample sintered at 1275°C and 1300°C read respectively 5056 and 5222, and that of the N3T30 sample emerged to be 2917 and 3389. Compared to that of pure MZFT ferrite, the TiO 2 and Nb 2 O 5 , SiO 2 and CaO added compositions displayed a nearly 45 % reduction in total power loss, mainly caused by the electrical insulating layers at the grain boundaries, which lowered the eddy current loss. The N3T30 ferrite sintered at 1275°C showed the lowest total power losses of 272 mW/cm 3 at 50°C.

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Synthesis, structure and electromagnetic properties of Mn–Zn ferrite by sol–gel combustion technique

Cited by 50 publications

References 26 publications

Structural and Electrical Properties of Low Temperature Fire Mn-Zn Nano Ferrite for High Frequency Application

Structural and Electrical Properties of Low Temperature Fire Mn-Zn Nano Ferrite for High Frequency Application

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

Effects of Nb2O5, TiO2, SiO2, and CaO additions on the loss characteristics of Mn-Zn Ferrite

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