Effect of temperature and time on properties of spark plasma sintered NiCuZn: Co ferrite

Zehani, K.; Mazaleyrat, F.; Loyau, Vincent

doi:10.1063/1.3561444

Cited by 15 publications

(8 citation statements)

References 17 publications

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“…At this working point, the reversible susceptibility is around 23 and according Eq. (20), the internal AC field is four times lower than the external one. Hence, due to the demagnetizing field, the ME coefficient is correspondingly diminished.…”

Section: Link Between Transversal and Longitudinal Modesmentioning

confidence: 83%

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Magnetoelectric effect in layered ferrite/PZT composites. Study of the demagnetizing effect on the magnetoelectric behavior

Loyau

Morin

Chaplier

et al. 2015

Journal of Applied Physics

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We report the use of high magnetomechanical coupling ferrites in magnetoelectric (ME) layered composites. Bilayer samples combining (Ni 0.973 Co 0.027 ) 1-x Zn x Fe 2 O 4 ferrites (x=0-0.5) synthetized by non conventional reactive Spark Plasma Sintering (SPS) and commercial lead zirconate titanate (PZT) were characterized in term of ME voltage coefficients measured at sub-resonant frequency. Strong ME effects are obtained and we show that an annealing at 1000°C and a quenching in air improve the piezomagnetic behavior of Zn-rich compositions. A theoretical model that predict the ME behavior was developed, focusing our work on the demagnetizing effects in the transversal mode as well as the longitudinal mode. The model shows that: (i) high ME coefficients are obtained when ferrites with high magnetomechanical coupling are used in bilayer ME composites, (ii) the ME behavior in transversal and longitudinal modes are quite similar, and differences in the shapes of the ME curves are mainly due the demagnetizing effects, (iii) in the transversal mode, the magnetic field penetration depends on the ferrite layer thickness and the ME coefficient is affected accordingly. The two later points are confirmed by measurements on ME samples and calculations. Performances of the ME composites made with high magnetomechanical coupling ferrites are compared to those obtained using Terfenol-D materials in the same conditions of size, shape, and volume ratio. It appears that a ferrite with an optimized composition has performances comparable to those obtained with Terfenol-D material. Nevertheless, the fabrication processes of ferrites are quite simpler. Finally a ferrite/PZT based ME composite was used as a current sensor.

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Section: Link Between Transversal and Longitudinal Modesmentioning

confidence: 83%

“…The alternative magnetization is related to the internal AC field: (19) Where is the reversible magnetic susceptibility (under constant stress). The internal AC field is expressed as: (20) χ can be considered constant for and practically independent of if .…”

Section: Demagnetizing Effectmentioning

confidence: 99%

Magnetoelectric effect in layered ferrite/PZT composites. Study of the demagnetizing effect on the magnetoelectric behavior

Loyau

Morin

Chaplier

et al. 2015

Journal of Applied Physics

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“…Spinel ceramics are important industrial materials; for example, soft ferrites are used for inductor cores in many communication modules, NiCuZn ferrite is used for cofiring with Ag electrode at low temperatures around 900°C. 13) Lower sintering temperature in a conventional process is enabled with Bi 2 O 3 additives 14) and/or using alternative processing methods, such as spark plasma sintering (SPS) 15) or microwave sintering, 16) but these are still far above the temperatures used in cold sintering. With further lowering sintering temperature, soft magnetic composite with magnetic metals can realize a novel magnetic property such as high frequency-high permeability and low loss materials.…”

Section: Introductionmentioning

confidence: 99%

Chelate complex assisted cold sintering for spinel ceramics

Funahashi

Kobayashi

Kimura

et al. 2019

J. Ceram. Soc. Japan

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A new chemical strategy using a specific chelate complex for the recently introduced "Cold Sintering Process" (CSP) shows the ability to obtain high densification in spinel-based ceramics. CSP is the technique for sintering many kinds of ceramics at low temperatures, no more than 300°C, enabled with a transient solvent. However, spinel ceramics are one of the most difficult materials, in which CSP typically does not achieve high densities.The chelating agent was introduced to aid the sintering of spinel-based ceramics that include important spinel materials, such as NiCuZn ferrite and NiMn thermistor. Chelate complex assisted CSP aids our basic tool box for enabling the CSP mechanism, and points to the potential of applying this approach to an even broader group of ceramic structures and chemistries.

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“…SPS is a relatively new technology to produce multimaterial compact systems with higher density, and using lower sintering temperature [2], [3]. Indeed, this process allows to sinter in an efficient way (heating rates over 100 K/min and overall duration of several tens of minutes) and to decrease the sintering temperature about 100 K due to the uniaxial pressure and diffusion enhancement.…”

Section: Introductionmentioning

confidence: 99%

Spark Plasma Sintering Co-Sintered Monolithic Transformers for Power Electronics

et al. 2016

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Power integration is a key issue to reduce the volume and weight of electronic devices in power applications. But, transformers produced using classical planar assembly are limited in design. Spark Plasma Sintering (SPS) is a relatively new technology to produce multimaterial compact system with higher density and using lower sintering temperature. The purpose of this study is to manufacture of a cubic-centimeter size transformers for high frequency application using SPS. The prototype presented in this paper is composed of two spiral copper coils separated by an insulated layer and encapsulated in ferrite powder. The assembly is then co-sintered by SPS. The magnetic material used for the transformers is a nickel-zinc based ferrite, with copper substitution to allow sintering at low temperatures. The low conductivity of this mixed-ferrite ensures operation in the frequency range of 1 to 20 MHz of our final system. Computed tomography scanning has been used to optimize the design of the co-sintered structures. Effects of the composition of the ferrite and the sintering temperature on the transformation ratio are discussed. It is shown that a ferrite with very low conductivity is required to ensure galvanic insulation, as there is a direct contact between the copper spirals and the magnetic parts.

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Effect of temperature and time on properties of spark plasma sintered NiCuZn: Co ferrite

Cited by 15 publications

References 17 publications

Magnetoelectric effect in layered ferrite/PZT composites. Study of the demagnetizing effect on the magnetoelectric behavior

Magnetoelectric effect in layered ferrite/PZT composites. Study of the demagnetizing effect on the magnetoelectric behavior

Chelate complex assisted cold sintering for spinel ceramics

Spark Plasma Sintering Co-Sintered Monolithic Transformers for Power Electronics

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