Microwave sintering of high-permeability (Ni0.20Zn0.60Cu0.20)Fe1.98O4 ferrite at low sintering temperatures

Yan, Mi; Hu, Jun

doi:10.1016/j.jmmm.2005.12.008

Cited by 36 publications

(18 citation statements)

References 23 publications

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“…20. It can be clearly seen that there is presence of large number of pores at the intergrain boundaries in the conventionally sintered sample, whereas the matrix of the microwave-sintered sample is found to be more uniform and compact, and its grain size is bigger [34].…”

Section: High Dielectric Constant Cacu 3 Ti 4 O 12 Powdermentioning

confidence: 97%

“…Under drive of microwave field, the kinetic energy of ions at grain boundaries increases, which results in decreasing the activation energy for a forward jump of ions and increasing the barrier height for a reverse jump [1]. So the forward diffusion of intergrain ions is promoted and thus accelerates the grain growth during sintering [34]. In many cases, the microwave sintering has shown to produce samples with more uniform grain size distribution and higher density [15].…”

Section: Increased Density and More Uniform Grain Size Distributionmentioning

confidence: 99%

“…High-permeability NiZn ferrites have been widely applied in various electronic devices. In order to obtain high relative initial permeability, a coarse and compact microstructure is required; a high-permeability NiZn ferrite, (Ni 0.20 Zn 0.60 Cu 0.20 )Fe 1.98 O 4 , was prepared by Yan and Hu using microwave sintering and conventional sintering [34]. Obviously, it can be seen from Fig.…”

Section: High Dielectric Constant Cacu 3 Ti 4 O 12 Powdermentioning

confidence: 99%

“…19. The dependence of (a) densities, (b) relative initial permeability and (c) relative loss factor tan ı/ i of microwave and conventionally sintered samples on sintering temperature [34]. sintered samples is greatly improved in comparison with that of the conventionally sintered ones.…”

Section: High Dielectric Constant Cacu 3 Ti 4 O 12 Powdermentioning

confidence: 99%

See 3 more Smart Citations

Microwave versus conventional sintering: A review of fundamentals, advantages and applications

Oghbaei

Mirzaee

2010

Journal of Alloys and Compounds

1,059

446

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Section: High Dielectric Constant Cacu 3 Ti 4 O 12 Powdermentioning

confidence: 97%

Section: Increased Density and More Uniform Grain Size Distributionmentioning

confidence: 99%

Section: High Dielectric Constant Cacu 3 Ti 4 O 12 Powdermentioning

confidence: 99%

Section: High Dielectric Constant Cacu 3 Ti 4 O 12 Powdermentioning

confidence: 99%

See 2 more Smart Citations

Microwave versus conventional sintering: A review of fundamentals, advantages and applications

Oghbaei

Mirzaee

2010

Journal of Alloys and Compounds

1,059

446

View full text Add to dashboard Cite

“…High-energy ball milled NiCuZn ferrites [72] were sintered using conventional and microwave methods, and characterized. An increase of grain size with the higher copper content is observed with microwave sintering.…”

Section: Conventionalmentioning

confidence: 99%

Role of Microwave Sintering in the Preparation of Ferrites for High Frequency Applications

Bharadwaj¹,

Murthy²

2014

Advanced Sensor and Detection Materials

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It is proven that the microwave sintering method is the truly low temperature method for the preparation of nanocrystalline magnetic oxide materials of diff erent sizes and shapes. Th is method saves time, energy, and cost. Th e materials can be produced in either a batch or continuous process using the said method. Th e key novelty of our work is the use of microwave sintering to dramatically enhance the kinetics of crystallization by one to two orders of magnitude. Th is paper will summarize the results obtained on various systems of soft ferrites, and Garnets (Ni-Cu-Zn ferrites, Mg-Cu-Zn ferrites, Ni-Zn ferrites, Co-Zn ferrites, Mn-Zn ferrites, YIG and GdIG, etc.), which were prepared by using microwave sintering method for various applications such as multilayer chip inductors, high frequency, microwave devices, and multilayered transformer cores, etc. All of these systems were sintered at a low temperature of 900 o C/ 30 minutes. Th e phase identifi cation, crystallinity, and morphology of the prepared powder were characterized by X-ray diff raction and transmission electron microscopy (TEM). Th e ferrites obtained with grain sizes varying from 80 nm to120 nm with high surface area ~ 26.8 m 2 g -1 to 156 m 2 g -1 . Th e performance of the sintered ferrites has been estimated from the studies of dependence of complex permittivity and permeability spectra on the frequency and temperature and it was found that the microwave sintered ferrites show improved dielectric and magnetic properties over conventionally sintered ferrites.

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Microwave Materials Processing in Solid Media

Horikoshi

Schiffmann²,

Fukushima

et al. 2017

Microwave Chemical and Materials Processing

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Microwave sintering of high-permeability (Ni0.20Zn0.60Cu0.20)Fe1.98O4 ferrite at low sintering temperatures

Cited by 36 publications

References 23 publications

Microwave versus conventional sintering: A review of fundamentals, advantages and applications

Microwave versus conventional sintering: A review of fundamentals, advantages and applications

Role of Microwave Sintering in the Preparation of Ferrites for High Frequency Applications

Microwave Materials Processing in Solid Media

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