High performance NiZn ferrite

Matsuo, Yoshio; Inagaki, M.; Tomozawa, T.; Nakao, F.

doi:10.1109/20.951172

Cited by 67 publications

(31 citation statements)

References 2 publications

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“…Density plays a key role in controlling the properties of polycrystalline ferrites [20,21]. The green density, the theoretical X-ray density and the sintered density for samples sintered at 900, 1000 and 1050°C are listed in Table 1.…”

Section: Densitymentioning

confidence: 99%

On the effects of Ga³⁺ and La³⁺ ions in MgCu ferrite: Humidity‐sensitive electrical conduction

Rezlescu¹,

Rezlescu

Sava³

et al. 2004

Cryst. Res. Technol.

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Pure and gallium or lanthanum substituted MgCu ferrites, Mg 0.5 Cu 0.5 Fe 2-x M x O 4 (with x = 0 or 0.2 and M = La or Ga) have been prepared by solid state reaction. Sintering experiments were carried out at different temperatures between 900 and 1100°C. The phase composition and lattice parameters were determined by XRD, while the effect of Ga and La substitutions on the granular structure was studied by SEM. Experimental results revealed that the densification behaviour and some physical properties are in close relation with the structural changes of pure ferrite caused by the presence of La and Ga substitutions. The gallium containing compound, Mg 0.5 Cu 0.5 Fe 1.8 Ga 0.2 O 4 , is monophasic and contains a great number of pores, whereas the lanthanum containing compound, Mg 0.5 Cu 0.5 Fe 1.8 La 0.2 O 4 , is biphasic and exhibits a high density. The humidity characteristics show that the gallium ion enhances the humidity sensitivity of the MgCu ferrite sintered at 1000°C. This interesting effect is promising for the future of the Ga-substituted MgCu ferrite to be used as sensitive material for fabrication of ceramic humidity sensors. IntroductionMixed ferrite attracted much attention because of their vast applications in a wide range, from microvawe to radio frequencies, such as microwave devices, computer memories and magnetic recording [1]. In many applications, they play an useful role because of their high resistivity and low eddy current losses . During the last years, many kinds of oxide ceramics have been investigated as materials for humidity sensors used in automatic humidity controlling systems [2 -9]. Basically, ceramic sensors can detect humidity on the basis of the change of the surface electrical conductivity by vapour adsorption.A particular attention was paid to Mg-ferrite (MgFe 2 O 4 ) [4,10,11]. This ceramic sintered at high temperatures is essentially more stable physically, chemically and thermally than other materials used for conventional humidity sensors [2]. A great advantage of using ferrites is their porous structure. For an humidity ceramic sensor it is very important that the fraction of open pores with respect to closed pores should be increased and the distribution of all open pores should be optimized [8,12]. Microstructure and intrinsic conductivity are found to be two key parameters which affect the sensor effect in oxide ceramics.The present study was concentrated on a magnesium-copper ferrite. A very limited amount of work is reported on this ferrite, although it is an inexpensive material and does not requires special conditions for preparation. Also, this ferrite is characterised by a high resistivity, being preferred in many electronic applications.

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Section: Densitymentioning

confidence: 99%

On the effects of Ga³⁺ and La³⁺ ions in MgCu ferrite: Humidity‐sensitive electrical conduction

Rezlescu¹,

Rezlescu

Sava³

et al. 2004

Cryst. Res. Technol.

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“…The most widely studied systems correspond to Co or Ni ferrites, with PZT, PNNT, BaTiO 3 (BT), BiFeO 3 or BST, with combinations both of ferrites and piezoelectrics, and various magnetic-electric bulk composites have been prepared in the last few years [2,[5][6][7][8][9][10][11]. Among them, the Ni-Zn ferrites/BaTiO 3 systems need to be further researched because of high electrical resistivity, chemical stability and excellent electromagnetic properties of the Ni-Zn ferrites [12,13], and high permittivity, low dielectric loss and high tunability of dielectric behaviors of BaTiO 3 [14,15]. With the development of electronic technology, the trends for miniaturization and excellent high-frequency characteristics of the microwave devices require the development of low-temperature co-fired ceramic (LTCC) materials [16].…”

Section: Introductionmentioning

confidence: 99%

Low-temperature sintering and electromagnetic properties of ferroelectric–ferromagnetic composites

Ling¹,

Zhang²,

Song³

et al. 2009

Journal of Magnetism and Magnetic Materials

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“…The saturation magnetization of spinel ferrites is mainly determined by their composition and sintering density, but power loss characteristics are also very sensitive to the microstructure and the nature and levels of impurities [6,7]. Bi 2 O 3 is an effective additive for improving the microstructure and lowering the sintering temperature of low-temperature-fired NiCuZn ferrites for multilayer chip inductor (MLCI) use [8][9][10]. However, the influences of added Bi 2 O 3 on the permeability and power loss characteristics of high-temperature-fired Ni-Zn ferrites have seldom been reported.…”

Section: Introductionmentioning

confidence: 99%

Influences of Bi2O3 additive on the microstructure, permeability, and power loss characteristics of Ni–Zn ferrites

Tang

Zhang

et al. 2009

Journal of Magnetism and Magnetic Materials

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High performance NiZn ferrite

Cited by 67 publications

References 2 publications

On the effects of Ga³⁺ and La³⁺ ions in MgCu ferrite: Humidity‐sensitive electrical conduction

On the effects of Ga³⁺ and La³⁺ ions in MgCu ferrite: Humidity‐sensitive electrical conduction

Low-temperature sintering and electromagnetic properties of ferroelectric–ferromagnetic composites

Influences of Bi2O3 additive on the microstructure, permeability, and power loss characteristics of Ni–Zn ferrites

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High performance NiZn ferrite

Cited by 67 publications

References 2 publications

On the effects of Ga3+ and La3+ ions in MgCu ferrite: Humidity‐sensitive electrical conduction

On the effects of Ga3+ and La3+ ions in MgCu ferrite: Humidity‐sensitive electrical conduction

Low-temperature sintering and electromagnetic properties of ferroelectric–ferromagnetic composites

Influences of Bi2O3 additive on the microstructure, permeability, and power loss characteristics of Ni–Zn ferrites

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On the effects of Ga³⁺ and La³⁺ ions in MgCu ferrite: Humidity‐sensitive electrical conduction

On the effects of Ga³⁺ and La³⁺ ions in MgCu ferrite: Humidity‐sensitive electrical conduction