Phase formation, sintering behavior and magnetic property of Bi–Co–Ti substituted M-type barium hexaferrite

Zhang, Wenjie; Bai, Yang; Han, Xiao; Wang, Liang; Lu, Xuefei; Li, Qiao; Cao, Jiangli; Guo, Dong

doi:10.1016/j.jallcom.2012.12.113

Cited by 30 publications

(4 citation statements)

References 27 publications

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“…Figure (a) presents the frequency dependence of the magnetic properties of the composites. The permeability increases and the cut‐off frequency decreases with the

f_{{Co}_{2} normalZ}

increasing from 60% to 95%, which well satisfied the Snoek's law . It is found that all the composites possess cut‐off frequency higher than 1.8 GHz.…”

Section: Resultssupporting

confidence: 67%

Low Loss Magneto‐Dielectric Composite Ceramics Ba₃Co₂Fe₂₄O₄₁/SrTiO₃ for High‐Frequency Applications

Chang

Wang

2014

J. Am. Ceram. Soc.

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Magneto-dielectric composite ceramics Ba 3 Co 2 Fe 24 O 41 /SrTiO 3 (Co 2 Z/STO) loading with high volume fraction of hexaferrite Co 2 Z (f Co2Z = 60%-95%) are successfully prepared by a hybrid process. The microstructures with homogeneously dispersed constituent grains are observed in these composites. The composites loading with 60%-80% hexaferrite possess stable magneto-dielectric properties in the frequency range from 10 MHz to 1 GHz with both low dielectric loss and magnetic loss. For the composite loading with 60% Co 2 Z, the relative permittivity is 28.08 and permeability is 4.46 (at 10 MHz), the dielectric loss tangent keeps below 0.009 within the frequency range from 10 MHz to 1 GHz. Also, it possesses a magnetic loss tangent of 0.006 and 0.144 at 50 MHz and 1 GHz, respectively, which are much lower than 0.056 and 1.242 of the single Co 2 Z phase at the same frequency. These excellent properties indicate that the low-loss Co 2 Z/STO composite ceramic is a new kind of multifunctional magneto-dielectric material with potential for high-frequency electromagnetic device applications.

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“…Figure (a) presents the frequency dependence of the magnetic properties of the composites. The permeability increases and the cut‐off frequency decreases with the

f_{{Co}_{2} normalZ}

increasing from 60% to 95%, which well satisfied the Snoek's law . It is found that all the composites possess cut‐off frequency higher than 1.8 GHz.…”

Section: Resultssupporting

confidence: 67%

Low Loss Magneto‐Dielectric Composite Ceramics Ba₃Co₂Fe₂₄O₄₁/SrTiO₃ for High‐Frequency Applications

Chang

Wang

2014

J. Am. Ceram. Soc.

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“…The properties of ferrite also depend on the microstructure. Ion substitution is a common method to adjust the properties based on alteration of the crystal structure, such as by La [4], Al [5], Mn [6], Cr [7], or Nd [8], or multiple ion substitution, such as of La-Zn [9], Co-Zr [10], Pr-Zn [11], Bi-La-Y [12], or Bi-Co-Ti [13]. Previous results have demonstrated that the properties of the composites can be improved and reduced in different degrees to meet the needs in various fields.…”

Section: Introductionmentioning

confidence: 99%

“…Previous results have demonstrated that the properties of the composites can be improved and reduced in different degrees to meet the needs in various fields. The most common preparation methods include sol-gel processes [13], conventional solid-state routes [14,15], co-precipitation methods [16], hydrothermal methods [17], and ball milling methods [18].…”

Section: Introductionmentioning

confidence: 99%

Structure, Spectra, Morphology, and Magnetic Properties of Nb5+ Ion-Substituted Sr Hexaferrites

Zhang

Wang

et al. 2022

Magnetochemistry

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SrFe12−xNbxO19 (x = 0.00–0.15) was here synthesized by a conventional solid-state reaction method. Thermogravimetry and differential scanning calorimetry curves revealed the sample reactions at four temperature ranges, and the optimal reaction stability was obtained at 1240 °C. A single-phase polycrystalline form of SrFe12O19 was obtained until the substitution reached 0.09, and the average crystallite size was found to be in the range of 44.21–60.02 nm. According to Fourier-transform infrared spectra, the formation of Fe–O bonds occurred at 69 and 450 cm−1 in the M-type ferrite, while Raman spectra revealed that all the peaks in the sample corresponded to Raman vibration modes and M-type structures. Through the shift of the peaks, it is speculated that Nb5+ enters into the lattice. The hysteresis loops of the samples were measured by vibrating-sample magnetometry, and the calculated results demonstrated that the coercivity increased with increases in the doping amount (686.3 Oe). At the same time, the saturation magnetization remained at a large value (>72.49 emu/g), which has rarely been reported.

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“…[13][14][15] The authors' previous work reported the properties of a Bi-Co-Ti substituted M-type hexaferrite (Ba 1Àx Bi x (Co 1.1+x Ti 1.1 ) Fe 9.8Àx O 19 ). 21,22 The Bi-Co-Ti substitution remarkably lowers the high sintering temperature of M-type hexaferrite to below 1000 C, so it meets the need of low temperature co-red ceramics (LTCC) technology and can be used to fabricate multilayer chip devices. Moreover, the low heat-treatment temperature controls the valence variation of transition metal ions, which enhances the magnetic properties, such as a higher permeability than that of a Co-Ti substituted M-type hexaferrite.…”

Section: Introductionmentioning

confidence: 99%

Engineering soft magnetic properties by doping ions in low-fired M-type hexaferrite with Bi–Co–Ti substitution

Bai

Zhang

et al. 2015

RSC Adv.

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Phase formation, sintering behavior and magnetic property of Bi–Co–Ti substituted M-type barium hexaferrite

Cited by 30 publications

References 27 publications

Low Loss Magneto‐Dielectric Composite Ceramics Ba₃Co₂Fe₂₄O₄₁/SrTiO₃ for High‐Frequency Applications

Low Loss Magneto‐Dielectric Composite Ceramics Ba₃Co₂Fe₂₄O₄₁/SrTiO₃ for High‐Frequency Applications

Structure, Spectra, Morphology, and Magnetic Properties of Nb5+ Ion-Substituted Sr Hexaferrites

Engineering soft magnetic properties by doping ions in low-fired M-type hexaferrite with Bi–Co–Ti substitution

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Phase formation, sintering behavior and magnetic property of Bi–Co–Ti substituted M-type barium hexaferrite

Cited by 30 publications

References 27 publications

Low Loss Magneto‐Dielectric Composite Ceramics Ba3Co2Fe24O41/SrTiO3 for High‐Frequency Applications

Low Loss Magneto‐Dielectric Composite Ceramics Ba3Co2Fe24O41/SrTiO3 for High‐Frequency Applications

Structure, Spectra, Morphology, and Magnetic Properties of Nb5+ Ion-Substituted Sr Hexaferrites

Engineering soft magnetic properties by doping ions in low-fired M-type hexaferrite with Bi–Co–Ti substitution

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Low Loss Magneto‐Dielectric Composite Ceramics Ba₃Co₂Fe₂₄O₄₁/SrTiO₃ for High‐Frequency Applications

Low Loss Magneto‐Dielectric Composite Ceramics Ba₃Co₂Fe₂₄O₄₁/SrTiO₃ for High‐Frequency Applications