Effects of Fe2+ content in raw materials on Mn–Zn ferrite magnetic properties

Li, Haihua; Zhang, Feng; He, Huan; Quanqing, Zhu; Jian-jun, Jiang; Nie, Jun; Yu, Xin

doi:10.1016/s0304-8853(01)00500-5

Cited by 26 publications

(4 citation statements)

References 6 publications

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“…Magnetic materials have been widely used and play an important role in many areas, such as magnetic drug targeting, spacecraft, precision instruments, optical communications, sensors, and electronic devices 1–6. Organic ferromagnetism has received a great deal of interest because of its structural diversification, low density, and easy processing 7, 8.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of ferromagnetic polyaniline with conductivity in an applied magnetic field

Zhang

Zhu

Kan

2008

J of Applied Polymer Sci

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Ferromagnetic polyaniline (PANI) with conductivity was synthesized with peroxydisulfate as an oxidant and horseradish peroxidase as a catalyst in an N 0 -a-hydroxythylpiperazine-N 0 -ethanesulfanic acid buffer solution containing aniline, HCl, and NiCl 2 Á6H 2 O in an applied magnetic field. The result of an electron paramagnetic resonance spectrum indicated that there were unpaired electrons in the resulting product, the spin density of which was 7.60 3 10 19 spins/g. The curve of the magnetization versus the magnetic field showed that PANI had soft ferromagnetic behavior at about 300 K. The saturation magnetization and coercive force of PANI were 0.033 emu/g and 5 Oe, respectively. Ultraviolet-visible and Fourier transform infrared spectra indicated that there was interaction between Ni 21 and PANI chains but the structure of the backbone chains of PANI synthesized in the presence of a magnetic field hardly changed compared with that of PANI synthesized without NiCl 2 Á6H 2 O.

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of ferromagnetic polyaniline with conductivity in an applied magnetic field

Zhang

Zhu

Kan

2008

J of Applied Polymer Sci

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“…Resistivity may vary according the oxygen content. Li Haihua [4] mentions that existence of Fe +2 decreases resistivity, thus increasing eddy current losses, especially at high frequencies. Existence of Fe +2 implies in free electrons inside the lattice, thus increasing the conductivity.…”

Section: Introductionmentioning

confidence: 99%

Effect of Oxygen Content during Sintering on the Losses of MnZn Ferrites

Janasi¹,

Lázaro-Colán

Landgraf

et al. 2014

MSF

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The magnetic properties of MnZn ferrites are highly influenced by the partial oxygen pressure during sintering. In this work MnZn ferrites with different chemical compositions were pressed in a toroidal form and sintered at 1290 °C for 6 h at different oxygen pressures. X ray diffraction using K-edge radiation of Fe, Zn and Mn were performed in order to identify the atomic preference in the MnZn ferrite spinel structure, by means of Rietveld analysis. Magnetic losses were measured at 25 °C and 100 °C (200mT, 100 kHz). The high temperature loss decreased with the increase of oxygen content during sintering whereas at room temperature this effect was opposite. The losses behavior as function of frequency was analyzed according the loss separation model.

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“…Soft ferrites with spinel structure are a category of ferrites. The genereal formula for these spinel ferrites is MeFe 2 O 4 where Me is a divalent metallic ion such as Fe, Ni, Cu, Mg, Mn or a mixture of these ions [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

An Investigation on the Optimum Conditions for Preparation of Pure Mn-Mg-Zn Ferrite Powder

Ebrahimi

Fard

2007

KEM

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Manganese- Zinc ferrite is one of the most important spinel ferrites which is used in the electronics applications. These ferrites have an open lattice and can tolerate large amounts of the other metallic ions in their lattice. One of these divalent ions that can sit in the unit cell of Mn-Zn ferrites is Magnesium. Mn-Mg-Zn ferrites are new materials which is thought to be a good candidate for dielectric applications. In this work, a suitable relative values of raw materials for preparing pure Mn-Mg-Zn ferrite powder have been determined. It is carried out by using XRD experiments. The optimum temperature and time of calcination were also investigated by DTA/TGA, XRD and SEM techniques.

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Effects of Fe2+ content in raw materials on Mn–Zn ferrite magnetic properties

Cited by 26 publications

References 6 publications

Synthesis and characterization of ferromagnetic polyaniline with conductivity in an applied magnetic field

Synthesis and characterization of ferromagnetic polyaniline with conductivity in an applied magnetic field

Effect of Oxygen Content during Sintering on the Losses of MnZn Ferrites

An Investigation on the Optimum Conditions for Preparation of Pure Mn-Mg-Zn Ferrite Powder

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