Microstructure, magnetic, and dielectric properties of Co–Zr co-doped hexagonal barium ferrites based on the sintering temperature and doping concentration

Fan, Lining; Cao, Hechun; Yu, Yishi; Zhang, Tianchi; Qi, Feng; Zheng, Haixing; Wu, Qiong; Zhang, Yang

doi:10.1007/s10854-020-04761-1

Cited by 6 publications

(3 citation statements)

References 42 publications

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“…Typical hard magnetic behavior is observed for all four Mo 6+ concentrations in these loops. Figure 6(B) demonstrates that the Mo 6+ additives act to decrease the M s , and obtained the M s of 66.057 emu/g at x = 0, which is approach to the other reports 27,28 . Actually, Fe 3+ in barium ferrite occupies five different positions: 2a, 2b, 12k, 4f 1 , and 4f 2 .…”

Section: Resultsmentioning

confidence: 53%

“…Figure 6(B) demonstrates that the Mo 6+ additives act to decrease the M s , and obtained the M s of 66.057 emu/g at x = 0, which is approach to the other reports. 27,28 Actually, Fe 3+ in barium ferrite occupies five different positions: 2a, 2b, 12k, 4f 1 , and 4f 2 . Among them, the magnetic moments of 2a, 2b, and 12k are upward, while those of 4f 1 and 4f 2 are downward.…”

Section: Resultsmentioning

confidence: 99%

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Molybdenum substituted M‐type hexagonal barium ferrite for high microwave absorption performance

Wu,

Dong,

et al. 2023

Int J Applied Ceramic Tech

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With the advancement of electrical and electronic devices, overcoming electromagnetic pollution turns into an urgent problem. In this work, high‐valence molybdenum (Mo6+) was doped into M‐type hexagonal barium ferrite (BaFe12‐xMoxO19) to improve its electromagnetic performance. The relationship between the Mo6+ doping concentration and the crystallographic structure, morphology and electromagnetic properties was studied in detail. Structural characterizations authenticate that the Mo6+ ions prefer the 2b site, increasing the lattice values and grain size, and boosting more Fe3+ conversion into Fe2+. The magnetic hysteresis loops demonstrate a reduction of saturation magnetization and coercivity values with the increase of Mo6+ concentration. While the microwave absorption properties were obviously improved by the doping Mo6+, and obtained the highest RLmin value of ‐56.12 dB@16.1GHz and effective absorption bandwidth of 4.2 GHz at x = 0.1, displaying a potential role in absorbing material.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 53%

Section: Resultsmentioning

confidence: 99%

Molybdenum substituted M‐type hexagonal barium ferrite for high microwave absorption performance

Wu,

Dong,

et al. 2023

Int J Applied Ceramic Tech

Self Cite

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“…The dielectric constant of the sample decreases gradually with increasing frequency, which is a common dielectric behavior of ferrite materials. According to the Maxwell-Wagner polarization model, this trend can be explained by a dual-layer dielectric structure, [25,33,34] where one layer consists of conducting grains and the other layer consists of nonconducting thin grain boundaries. In the low-frequency region, the conducting ferrite grains dominate, leading to a higher dielectric constant.…”

Section: Dielectric Constantmentioning

confidence: 99%

Structural Elucidation and Evaluation of Magnetic and Dielectric Properties of Lu–La Co‐substituted M‐Type Hexagonal Ferrites Synthesized by Chemical Co‐precipitation Method

Wang,

Han

2024

Physica Status Solidi (a)

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In this research, LuxLaySr1–yFe12–xO19, an M‐type strontium ferrite, is synthesized using the coprecipitation method with precursor chemicals. The samples undergo analysis for structure, morphology, and elemental composition through X‐ray diffraction (XRD) and scanning electron microscopy (SEM). Magnetic and dielectric properties are determined using a vibrating sample magnetometer (VSM) and a dielectric property measurement instrument (LCR), respectively. The primary objective of this study is to enhance the dielectric performance of the samples through rare‐earth element doping. The XRD analysis reveals that the samples display a hexagonal single‐phase magnetoplumbite crystal structure. SEM micrographs illustrate a regular hexagonal structure of the grains. VSM analysis affirms LuxLaySr1–yFe12–xO19 as a hard magnetic material with a high coercivity. As the rare‐earth element content increases, the coercivity of the samples significantly decrease from 2065.3 to 910.3 Oe. Dielectric property analysis demonstrates that augmenting the rare‐earth element (Lu–La) content notably increases the relative dielectric constant of the samples. In the low‐frequency region, the relative dielectric constant ranges from 6.71 × 103 to 1.28 × 105, while in the high‐frequency region, it ranges from 3.09 × 103 to 2.03 × 104. Samples doped with rare‐earth elements exhibit a high dielectric constant and low coercivity, rendering them suitable for applications in electromagnetic shielding materials. This can help reduce interference from magnetic fields on internal components while blocking electromagnetic waves.

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Enhanced electromagnetic properties of low-temperature sintered NiCuZn ferrites by doping with Bi2O3

Shen

Zhao

et al. 2022

Ceramics International

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Microstructure, magnetic, and dielectric properties of Co–Zr co-doped hexagonal barium ferrites based on the sintering temperature and doping concentration

Cited by 6 publications

References 42 publications

Molybdenum substituted M‐type hexagonal barium ferrite for high microwave absorption performance

Molybdenum substituted M‐type hexagonal barium ferrite for high microwave absorption performance

Structural Elucidation and Evaluation of Magnetic and Dielectric Properties of Lu–La Co‐substituted M‐Type Hexagonal Ferrites Synthesized by Chemical Co‐precipitation Method

Enhanced electromagnetic properties of low-temperature sintered NiCuZn ferrites by doping with Bi2O3

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