Development of high-temperature high-permeability MnZn power ferrites for MHz application by Nb2O5 and TiO2 co-doping

Yi, Shengbo; Bai, Guohua; Wang, Xiaoyu; Zhang, Xue Feng; Hussain, Akhlaq; Yan, Mi

doi:10.1016/j.ceramint.2019.12.140

Cited by 27 publications

(7 citation statements)

References 38 publications

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“…Eddy current loss P e is inversely related to the resistivity of MnZn ferrite 16,35,36 . Figure 7(C) indicates that the resistivity of MnZn ferrites firstly decreases and then increases with the increase in sintering temperature, and the eddy current loss shows an opposite variation trend.…”

Section: Resultsmentioning

confidence: 99%

“…Eddy current loss P e is inversely related to the resistivity of MnZn ferrite. 16,35,36 the eddy current loss shows an opposite variation trend. When the sintering temperature is 1130 • C, due to insufficient solid-phase reaction during the sintering process, there are many defects in the crystal lattice, resulting in extremely low resistivity and extremely large eddy current loss.…”

Section: High-frequency Core Lossesmentioning

confidence: 97%

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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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Section: Resultsmentioning

confidence: 99%

Section: High-frequency Core Lossesmentioning

confidence: 97%

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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“…E-mail: zhzhang@hdu.edu.cn, zhang@hdu.edu.cn highly resistive grain boundary segregation by TEM even at a low doping level (∼1000 ppm). 2,[34][35][36] There are also studies claiming the lattice substitution of Ca 2+ in spinel ferrites and the corresponding variation of magnetic properties. 20,[37][38][39][40][41][42] Therefore, the direct atomic-scale microscopic observation of Ca 2+ occupation in the spinel lattice is the premise of revealing its doping mechanism, which not only benefits the construction of ferrite theory, but also promotes the development of high-performance ferrite products.…”

Section: Institute Of Advanced Magnetic Materials College Of Material...mentioning

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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“…Most power supplies currently operate in the 200 kHz to 3 MHz frequency range, predominantly employing ferrite core materials [9][10][11][12][13][14][15]. The inductive reactance, represented as jωL, implies that as operating frequencies (ω) increase, the required inductance values (L) decrease.…”

Section: Introductionmentioning

confidence: 99%

Contribution of Magnetization Mechanisms in MnZn Ferrites with Different Grain Sizes and Sintering Densification

Liu,

Liao,

et al. 2024

Coatings

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This study investigates the magnetization mechanisms in MnZn ferrites, which are key materials in high-frequency power electronics, to understand their behavior under various sintering conditions. Employing X-ray diffraction and scanning electron microscopy, we analyzed the microstructure and phase purity of ferrites sintered at different temperatures. Our findings confirm consistent spinel structures and highlight significant grain-growth and densification variabilities. Magnetic properties, particularly the saturation magnetization (Ms) and initial permeability (μi), were explored, revealing their direct correlation with the sintering process. The decomposition of magnetic spectra into domain-wall-motion and spin-rotation components offered insights into the dominant magnetization mechanisms, with the domain wall movement becoming increasingly significant at higher sintering temperatures. The samples sintered at 1310 °C showcased superior permeability and the least loss in our investigations. This research underscores the impact of sintering conditions on the magnetic behavior of MnZn ferrites, providing valuable guidelines for optimizing their magnetic performance in advanced electronic applications and contributing to the material science field’s understanding of the interplay between sintering, microstructures, and magnetic properties.

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Development of high-temperature high-permeability MnZn power ferrites for MHz application by Nb2O5 and TiO2 co-doping

Cited by 27 publications

References 38 publications

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

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

Contribution of Magnetization Mechanisms in MnZn Ferrites with Different Grain Sizes and Sintering Densification

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