Effect of Nb2O5 additions on the power loss of NiZn ferrites

Rao, B. Bhaskara; Kim, CheolGi

doi:10.1007/s10853-007-1789-1

Cited by 17 publications

(6 citation statements)

References 5 publications

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“…They explained their results in terms of spin canting and deviation in site preferences of the cations in the nano state from their normal bulk cationic distribution. Addition of V 2 O 5 and Nb 2 O 5 to the basic Ni-Zn and Mn-Zn ferrites had been reported as a corrective measure by several groups [47][48][49] to decrease the power losses and to raise the frequency at which the material can be operated safely in high frequency transformer applications. Effect of NiO doping on the properties of Mn-Zn ferrites was investigated by Sun et al [50] and reported that the NiO helped to enhance the electrical resistivity, and thereby decreased the eddy-current loss.…”

Section: High Frequency Device Applicationsmentioning

confidence: 99%

Magnetic Nanoparticles: Fabrication, Properties and Applications

Rao

Abbas

2018

Magnetic Oxides and Composites

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Magnetic nanoparticles are being widely used as potential materials in several applications, namely, consumer electronics, automobile and biomedical fields. Magnetic nanoparticles compacted in an insulating matrix are shown to be excellent materials for miniaturized high frequency electronic devices. Substituted cobalt ferrites and their self composites are increasingly found suitable for non-contact torque sensors. Functionalized magnetic nanoparticles and core-shell nanostructures would prove beneficial for biomedical applications. In this chapter, some simple preparation routes and common characterization techniques for the study of magnetic nanoparticles are covered. Further, recent advances and future prospects in all three application areas mentioned above are briefly discussed.

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Section: High Frequency Device Applicationsmentioning

confidence: 99%

Magnetic Nanoparticles: Fabrication, Properties and Applications

Rao

Abbas

2018

Magnetic Oxides and Composites

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“…Diversified aspects of experimental studies are reported [23,[30][31][32][33] in Nb 5? -doped Ni-Zn ferrites.…”

Section: Introductionmentioning

confidence: 99%

“…However, for higher doping levels, large grains with deeply extended intergranular pores and secondary imperfections are found to grow. Power loss investigations in microsized Nb 2 O 5 -doped Ni-Zn ferrites are reported [32] to decrease the grain size (D) at lower concentrations, and to promote the grain growth at higher concentrations. Reduction in D is also reported [19] in Nb 5?…”

Section: Introductionmentioning

confidence: 99%

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Experimental characterization of nanocrystalline niobium-doped nickel–zinc ferrites: occurrence of superparamagnetism

Lakshmi¹,

Sridhar

Govindraj

et al. 2016

J Mater Sci

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Structural, morphological, magnetic, and dielectric investigations are carried out in Nb-doped (viz., for x equal to 0.0-0.4 by wt%) nanocrystalline Ni-Zn ferrites synthesized by hydrothermal method. XRD, IR studies infer the growth of nano structures and Fe 2 O 3 phase. Nb ions segregate at grain boundaries. Crystallite size (D) varies from 62 to 18 nm with x. FTIR absorption exhibits split at higher x. Saturation magnetization witnesses an overall decrease with x. Trends of M s (x) are explained by nature of dopant, preferential replacement, surface canting (Y-K angles) and lattice contraction. Variations of coercive field (H c ) and D infer singledomain to multi-domain morphological transformation. Occurrence of superparamagnetism (SPM) is predicted for zeroed values of H c and for a critical concentration x crit equal to 0.321. Enhanced Nb 5? -Fe 2? binding with dopant (x up to 0.2) results for decrease in dielectric constant e 0 r , loss factor tand and increase in resistivity q. Lowered ac conductivity is attributed to blockade of path by Nb 5? ions in the vicinity of B-sites. Relatively higher q (*10 8 X cm) and lower loss (tand *10 -2 -10 -3 ) evinced for 10 kHz. Enhanced core loss is realized with x manifested as lowered H c and tand to usher their utility in high-frequency applications.

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“…Nb 2 O 5 and WO 3 have been reported as efficient sintering aids among different additives. Rao and Kim [12] reported that Nb 2 O 5 additive can make NiZn ferrites obtain high permeability. Su et al [7] found that WO 3 additive can be conducive to promote densification and improve magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nb2O5–WO3 additive on microstructure and magnetic properties of low-temperature-fired NiCuZn ferrites

Zhu

et al. 2015

J Mater Sci: Mater Electron

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The low-temperature-fired NiCuZn ferrites with different amount of Nb 2 O 5 and WO 3 additives were prepared by solid-state reaction method. The effects of Nb 2 O 5 and WO 3 additives on sintering behavior, microstructures and magnetic properties of NiCuZn ferrites were investigated. It is found that Nb 2 O 5 and WO 3 additives overtly improve the densification of samples through grains uniformity and grains growth promotion. The appropriate Nb 2 O 5 and WO 3 additives not only can noticeably increase the initial permeability (l i ) and saturation flux density (B s ), but also can obviously reduce the remanent flux density (B r ) and coercive field strength (H c ). However, too much additive will deteriorate the magnetic properties. By contrast, 0.2 wt% Nb 2 O 5 and 0.5 wt% WO 3 added in NiCuZn ferrites shows excellent magnetic properties: l i = 674.81 at 100 kHz, B s = 142.48 mT, B r = 63.32 mT and H c = 31.39 A m -1 .

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Effect of Nb2O5 additions on the power loss of NiZn ferrites

Cited by 17 publications

References 5 publications

Magnetic Nanoparticles: Fabrication, Properties and Applications

Magnetic Nanoparticles: Fabrication, Properties and Applications

Experimental characterization of nanocrystalline niobium-doped nickel–zinc ferrites: occurrence of superparamagnetism

Effects of Nb2O5–WO3 additive on microstructure and magnetic properties of low-temperature-fired NiCuZn ferrites

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