Co2O3 and SnO2 doped MnZn ferrites for applications at 3–5 MHz frequencies

Hussain, Akhlaq; Bai, Guohua; Huo, Huaxin; Yi, Shengbo; Wang, Xiaoyu; Fan, Xiuyuan; Yan, Mi

doi:10.1016/j.ceramint.2019.03.193

Cited by 33 publications

(8 citation statements)

References 40 publications

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“…These materials can be applied in a wide range of technological applications, such as biomedicine 5,6 , electronics 7,8 or energy storage 9,10 . They are increasingly gaining attention for high frequency microwaves applications [11][12][13][14] ; their large electrical resistivity makes them unique materials due to the reduced eddy current losses that they experience at elevated frequencies.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Synthesis Route in Obtaining the Cubic or Tetragonal Copper Ferrite Phases

Rosa

Segarra

2020

Inorg. Chem.

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In this work, magnetic copper ferrite nanoparticles are synthesized by polymer-assisted sol-gel and co-precipitation methods. The obtained purity and particle size reach values of 96 % and 94 nm, respectively. Evident differences in the crystal structure have been found in the synthesized nanoparticles. A tetragonal structure is formed by the sol-gel method, while the cubic form is obtained when the co-precipitation approach is used. This work provides an experimental evidence of the formation of both phases by using the same reactants and thermal conditions, and only modifying the technical procedure. The formation and stability of each phase is analysed by temperature dependent measurements, and the observed crystal structure differences are used to propose a potential fundamental explanation to our observations based on a difference on the cations' distribution and the Jahn-Teller distortion. Moreover, different copper ferrite purity and particle sizes are found when using each of the methods. The spherical shape of the particles and their tendency to sinter forming micrometric clusters are observed by electron microscopy. Finally, the divergence in magnetization between the samples prepared by each method support our argument about the different cations' distribution and open the door to a wide range of different technological applications for these materials.

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Section: Introductionmentioning

confidence: 99%

Influence of the Synthesis Route in Obtaining the Cubic or Tetragonal Copper Ferrite Phases

Rosa

Segarra

2020

Inorg. Chem.

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“…For example, hysteresis loss can be reduced by reducing the magnetocrystalline anisotropy and increasing the initial permeability 12,13 . Improving the resistivity of the magnetic core material by using high‐resistivity additives can obviously reduce the eddy current loss 14–18 . It is worth noting that at high frequencies, the residual loss shares the highest percentage of total losses, which is related to the resonance phenomenon at high frequencies 19–21 .…”

Section: Introductionmentioning

confidence: 99%

Effects of magnetic domain morphology on the magnetic spectrum and high‐frequency core losses of MnZn ferrites

Wu,

Yu,

Guo

et al. 2023

J Am Ceram Soc.

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MnZn ferrites that exhibit low core losses at high frequencies are suitable for the integration and miniaturization of power conversion devices. To obtain low core losses at high frequencies, it is important to understand the underlying mechanism. In this work, MnZn ferrites with various grain sizes were produced by changing the sintering temperature. The relationship between domain morphology, dynamic magnetization behavior, and core losses at high frequencies was carefully investigated. As the average grain size approached the critical size of single‐domain state, the contribution of domain wall displacement to complex permeability decreased, while domain wall resonant frequency improved significantly, resulting in the suppression of residual loss at 3 MHz. As the average grain size increased, the domain morphology changed from a single‐domain state to a multidomain state, which increased the initial permeability and decreased hysteresis loss. However, the number of domain walls increased, causing a significant decrease in the domain wall resonant frequency, and resulting in a sharp increase in residual loss. These results provide valuable insights into reducing high‐frequency core losses in MnZn ferrites by domain engineering.

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“…For a given MFe 2 O 4 spinel ferrite, its magnetic properties can be effectively tailored by extra elemental doping. 3,13,[18][19][20][21][22] Traditionally, there are three types of dopant mechanisms including (i) soluble cations (Ti 4+ , 23 Sn 4+ , 24 etc.) that may incorporate into the tetrahedral or octahedral sites of the spinel lattice, modifying the intrinsic properties such as magnetization, anisotropy and resistivity; (ii) dopants (SiO 2 , 25 CaO, 26 ZrO 2 27 and HfO 2 28 ) that tend to precipitate at the grain boundaries, prohibiting grain growth and acting as the highly resistive grain boundary phase; (iii) oxides with a low melting point (V 2 O 5 , 29 Bi 2 O 3 30 and MoO 3 31 ) that form a liquid phase during the sintering of bulk ferrites.…”

Section: Introductionmentioning

confidence: 99%

Atomic-scale observation of calcium occupation in spinel cobalt ferrite towards the regulation of intrinsic magnetic properties

Bai,

Zhong,

Zhang

et al. 2023

Nanoscale

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Co2O3 and SnO2 doped MnZn ferrites for applications at 3–5 MHz frequencies

Cited by 33 publications

References 40 publications

Influence of the Synthesis Route in Obtaining the Cubic or Tetragonal Copper Ferrite Phases

Influence of the Synthesis Route in Obtaining the Cubic or Tetragonal Copper Ferrite Phases

Effects of magnetic domain morphology on the magnetic spectrum and high‐frequency core losses of MnZn ferrites

Atomic-scale observation of calcium occupation in spinel cobalt ferrite towards the regulation of intrinsic magnetic properties

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Co2O3 and SnO2 doped MnZn ferrites for applications at 3–5 MHz frequencies

Cited by 33 publications

References 40 publications

Influence of the Synthesis Route in Obtaining the Cubic or Tetragonal Copper Ferrite Phases

Influence of the Synthesis Route in Obtaining the Cubic or Tetragonal Copper Ferrite Phases

Effects of magnetic domain morphology on the magnetic spectrum and high‐frequency core losses of MnZn ferrites

Atomic-scale observation of calcium occupation in spinel cobalt ferrite towards the regulation of intrinsic magnetic properties

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Product

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Co2O3 and SnO2 doped MnZn ferrites for applications at 3–5 MHz frequencies