Development of high-performance dry-pressed anisotropic permanent ferrite for La–Ca–Sr–Co system

Zhu, Daiman; Geng, Zhaowen; Liu, Rongming; Xiao-wen, Zhou; Jia, Lijun; Hu, Guohui; Wang, Qian; Li, Bingshan

doi:10.1007/s12598-019-01260-z

Cited by 5 publications

(1 citation statement)

References 27 publications

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“…Du 等人 [69] [68] 。目前 Ca-La-Co 已经通过不同的方法合成，如微波烧结 [70,71] ，在预烧结铁氧体上采用湿压和干压相结合后取向的方法 [72] ，以及由研磨、干燥、煅烧、掺杂和烧结等不同步骤组成的陶瓷工艺 [73][74][75] 。 Li 等 [73] 研究了成分为 Sr 0. [78] 提出轻稀土的溶解度随原子序数的增加而降低。尽管如今在稀土离子替代的制备方法上取得了一些进展，如水热法粉末制备以优化材料合成 [79][80][81] ，但单相稀土替代铁氧体 Sr 1-x RE x Fe 12 O 19 的合成仍然是一个不小的挑战。与此同时，不同稀土离子在 SrM 中的溶解度得以系统研究 [82][83][84][85][86][87][88][89][90] ，分别是 Ce(0.…”

Section: 国内铁氧体永磁材料的现状与发展趋势unclassified

Research progress of magnetic anisotropy enhancement mechanism of high-performance La-Co co-substituted M-type permanent magnet ferrites

Liu,

Wang,

et al. 2024

Acta Phys. Sin.

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La-Co co-substituted M-type ferrite,first reported at the end of the 20th century,has garnered continuous attention from researchers worldwide,serving as the cornerstone for high-performance permanent magnet ferrites.The unquenched orbital moments of Co2+ play a pivotal role in enhancing the uniaxial anisotropy of M-type ferrites.However,a comprehensive understanding of its microscopic mechanism remains elusive.In response to the escalating performance demands of ferrite materials,elucidating the mechanism behind magnetic anisotropy enhancement becomes imperative,alongside the quest for guiding principles facilitating the swift and cost-effective development of high-performance products.but its mechanism at the microscopic level has not been explained.This review encompasses a comprehensive analysis of various studies aimed at pinpointing the crystal sites of Co substitution within the lattice.These investigations including neutron diffraction,nuclear magnetic resonance,and Mössbauer spectroscopy delve into the fundamental origins underlying the enhancement of magnetic anisotropy,thereby furnishing valuable insights for material design strategies geared towards further augmenting the magnetic properties of permanent magnet ferrites.The exploration of Co-substitution sites has yielded noteworthy findings.Through meticulous examination and analysis,researchers have discerned the intricate interplay between Co ions and the lattice structure,shedding light on the mechanisms governing magnetic anisotropy enhancement.The current mainstream view is that Co ions tend to occupy more than one site,namely the 4f1,12k,and 2a sites,all of which are located within the spinel lattice.However,there have also been differing viewpoints,indicating that further exploration is needed to uncover the primary controlling factors influencing Co occupancy.Notably,the identification of specific Co substitution sites,especially the spin-down tetrahedron 4f1,has enabled targeted modifications,culminating in the fine-tuning of magnetic properties with remarkable precision.Furthermore,the reviewed studies underscore the pivotal role of crystallographic engineering in tailoring the magnetic characteristics of ferrite materials.By strategically manipulating Co substitution,researchers have harnessed the intrinsic properties of the lattice to amplify magnetic anisotropy,thereby unlocking new avenues for the advancement of permanent magnet ferrites.In conclusion,the collective findings outlined in this review herald a promising trajectory for the field of permanent magnet ferrites.Armed with a nuanced understanding of Co-substitution mechanisms,researchers are poised to chart novel pathways toward the development of next-generation ferrite materials boasting enhanced magnetic properties.

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Section: 国内铁氧体永磁材料的现状与发展趋势unclassified

Research progress of magnetic anisotropy enhancement mechanism of high-performance La-Co co-substituted M-type permanent magnet ferrites

Liu,

Wang,

et al. 2024

Acta Phys. Sin.

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Recent advances in hard ferrite magnets

Bollero

Palmero

2022

Modern Permanent Magnets

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Improved magnetic properties of self-composite SrFe12O19 powder prepared by Fe3O4 nanoparticles

Liu

et al. 2022

Arabian Journal of Chemistry

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Development of high-performance dry-pressed anisotropic permanent ferrite for La–Ca–Sr–Co system

Cited by 5 publications

References 27 publications

Research progress of magnetic anisotropy enhancement mechanism of high-performance La-Co co-substituted M-type permanent magnet ferrites

Research progress of magnetic anisotropy enhancement mechanism of high-performance La-Co co-substituted M-type permanent magnet ferrites

Recent advances in hard ferrite magnets

Improved magnetic properties of self-composite SrFe12O19 powder prepared by Fe3O4 nanoparticles

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Development of high-performance dry-pressed anisotropic permanent ferrite for La–Ca–Sr–Co system

Cited by 5 publications

References 27 publications

Research progress of magnetic anisotropy enhancement mechanism of high-performance La-Co co-substituted M-type permanent magnet ferrites

Research progress of magnetic anisotropy enhancement mechanism of high-performance La-Co co-substituted M-type permanent magnet ferrites

Recent advances in hard ­ferrite magnets

Improved magnetic properties of self-composite SrFe12O19 powder prepared by Fe3O4 nanoparticles

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Product

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Recent advances in hard ferrite magnets