Magnetic and dielectric properties of low-loss MnZn ferrites with wide temperature stability

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of the American Ceramic Society Pub Date : 2024-09-13 DOI:10.1111/jace.20137

Yao Ying, Guo Chen, Zhaocheng Li, Jingwu Zheng, Jing Yu, Liang Qiao, Wangchang Li, Juan Li, Naoki Wakiya, Masahiro Yamaguchi, Shenglei Che

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Abstract

To meet the needs for higher energy efficiency and a wide operating temperature range of electric vehicles, the low-loss MnZn ferrites in a wide temperature range have been developed by optimizing the Fe content and the oxygen partial pressure (P_O2) during the sintering process in this work. For the optimal sample, power loss at 300 kHz/100mT is 204 kW/m³ at 25°C and remains below 290 kW/m³ in the wide temperature range from -10 to 120°C. The loss separation method was employed to clarify the effects of the Fe content and P_O2 on power loss. The equivalent circuit model has been employed to fit the complex impedance and it is found that the increase of P_O2 enhances both the grain resistance R_g and the grain boundary resistance R_gb. The enhancement of R_gb is mainly responsible for the reduction of eddy current loss and consequently power loss. Dielectric permittivity is as large as about 15000 in this series of samples due to the electric polarization at the rich grain boundaries. Dielectric loss is very low between -50 and 150°C and has little contribution to the energy loss.

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具有宽温度稳定性的低损耗锰锌铁氧体的磁性和介电特性

为了满足电动汽车对更高能效和更宽工作温度范围的需求，本研究通过优化烧结过程中的铁含量和氧分压（PO2），开发出了宽温度范围内的低损耗锰锌铁氧体。对于最佳样品，300 kHz/100mT 的功率损耗在 25°C 时为 204 kW/m3，在 -10 至 120°C 的宽温度范围内保持在 290 kW/m3 以下。采用损耗分离法来阐明铁含量和 PO2 对功率损耗的影响。采用等效电路模型拟合复阻抗，发现 PO2 的增加会增强晶粒电阻 Rg 和晶界电阻 Rgb。Rgb 的增强是涡流损耗减少的主要原因，因此也是功率损耗减少的主要原因。由于富晶粒边界的电极化，该系列样品的介电常数高达约 15000。介电损耗在 -50 至 150°C 之间非常低，对能量损耗的影响很小。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.