Tailoring of structural, electrical and magnetic properties of BaCo2 W-type hexaferrites by doping with Zr–Mn binary mixtures for useful applications

Iqbal, Muhammad Javed; Khan, Rafaqat Ali; Mizukami, Shigemi; Miyazaki, T.

doi:10.1016/j.jmmm.2011.03.009

Cited by 34 publications

(9 citation statements)

References 38 publications

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“…. It is reported before in case of BaCoZnFe16 O 27 that L ex may be much smaller than 35 nm due to the small values of exchange constant and large value of magneto-crystalline anisotropy constant[17]; consequently, the same hypothesis holds for SrCo 2 Fe 16 O 27 with the grain sizes in the range of 34-42 nm, which are larger than the exchange length.…”

mentioning

confidence: 56%

“…Figure 7 illustrates the variation of coercivity with an increase in dopant contents which exhibit random behavior. It is assumed that the content of Zn, Ca, and Mn has little effect on the coercivity but more or less depends on the particles size of the magnetic materials [17]. It is well known that particle size has a significant role on the magnetic properties of the magnetic materials.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

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Effects of Divalent Ion Substitution on the Microstructure and Magnetic Properties of SrCo 2−x (MnZnCa) x/3Fe 1 6 O 2 7 Nanoparticles

Ghasemi

2016

J Supercond Nov Magn

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W-type hexaferrite nanoparticles with a composition of SrCo 2−x (MnZnCa) x/3 Fe 16 O 27 (x = 0-0.5) were synthesized by a chemical co-precipitation method. The effect of substitution of Mn, Zn, and Ca cations on the structural and magnetic properties of nanoparticles was characterized by X-ray diffraction (XRD), Fourier transformed infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), and vibrating sample magnetometer (VSM). The XRD patterns confirmed the existence of hexagonal W-type single phase ferrite. According to the SEM micrographs, it was found that the particle size lies in the range of 40-60 nm, with an irregular configuration. The elemental composition estimated from the EDX analysis was in good agreement with the nominal composition. Hysteresis loops for all samples were measured at a room temperature up to a maximum applied field of 10 kOe. The results revealed that with an increase in substitutional cation contents, the values of saturation magnetization and coercivity decreased from 78.4 to 70.8 emu/g and the values of coercivity also decreases from 1350 to 940 Oe. Correlation between structural and magnetic analyses was also earned out.

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mentioning

confidence: 56%

Section: Magnetic Propertiesmentioning

confidence: 99%

Effects of Divalent Ion Substitution on the Microstructure and Magnetic Properties of SrCo 2−x (MnZnCa) x/3Fe 1 6 O 2 7 Nanoparticles

Ghasemi

2016

J Supercond Nov Magn

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“…(1) Firstly, the raw materials were put into the LJM-5L ball mill and anhydrous ethyl alcohol was taken as the medium sphere to be churned for 6 h. After that, the epoxy resin was added into the mill to be stirred for another 2 h. Epoxy resin was used to cooperate with sucrose and to enlarge the contact area of the components in the agglomerate powders. It can be transformed to CO, CO 2 , and H 2 O in SHS reaction due to the high temperature. Secondly, the mixtures were dried and carbonized at 200°C until no smoke releases.…”

Section: Fig1 Principle Diagram For Preparation Of Hollow Microsphermentioning

confidence: 99%

“…Application ranges have been limited due to shortcomings of bandwidth, low efficiency and large density. It is urgent need to develop new high performance light microwave absorbing materials [1][2].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Electromagnetic Properties of Ni-Co Coated W-type Barium Ferrite Hollow Microspheres

Li¹,

Wang²,

Mi³

et al. 2016

Proceedings of the 2016 2nd International Conference on Advances in Energy, Environment and Chemical Engineering (AEECE 2016)

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Abstract:The Ni-Co coated W-type barium ferrite (BaZn 0.6 Co 1.4 Fe 16 O 27 ) hollow microspheres (W-BFHMs) have been prepared by the self-reaction quenching technology and heat treatment at 1250 ℃. The W-BFHMs is a type of light microwave absorbing material in GHz frequencies and its average particle size is 60 μm. A conductive and magnetic Ni-Co layer was coated on the surface of W-BFHMs by electroless plating. Effects of plating time on the particle size, morphology, phase structure and microwave absorption properties of Ni-Co coated W-BFHMs are investigated through SEM, XRD, particle size analyzer and vector network analyzer. The results show that the Ni-Co deposits in the sag and the trench firstly and grows as the branch after filling the sag and the trench. With the increase of the plating time from 5 min to 25 min, the magnetic loss increase from 0.15 to 0.35, while the dielectric loss is not significantly change due to the incompletely covered. The effective absorbing bandwidth increase from 1 GHz to 2.7 GHz, while the absorption peak decrease from -12 dB to -32dB when the plating time is 25 min.

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“…Doping of BaCd 2 Fe 16 values of saturation magnetization and remanent magnetization, respectively, have been achieved [9]. Saturation magnetization of 67.0 emu/g and remanent magnetization of 34.7 emu/g are obtained for a Zr 4+ -Mn 2+ substituted W-type hexaferrites system [10].…”

Section: Introductionmentioning

confidence: 99%

W-type hexaferrite nanoparticles: A consideration for microwave attenuation at wide frequency band of 0.5–10GHz

Iqbal

Khan

Takeda³

et al. 2011

Journal of Alloys and Compounds

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Tailoring of structural, electrical and magnetic properties of BaCo2 W-type hexaferrites by doping with Zr–Mn binary mixtures for useful applications

Cited by 34 publications

References 38 publications

Effects of Divalent Ion Substitution on the Microstructure and Magnetic Properties of SrCo 2−x (MnZnCa) x/3Fe 1 6 O 2 7 Nanoparticles

Effects of Divalent Ion Substitution on the Microstructure and Magnetic Properties of SrCo 2−x (MnZnCa) x/3Fe 1 6 O 2 7 Nanoparticles

Preparation and Electromagnetic Properties of Ni-Co Coated W-type Barium Ferrite Hollow Microspheres

W-type hexaferrite nanoparticles: A consideration for microwave attenuation at wide frequency band of 0.5–10GHz

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