Flux Single Crystal Growth of BaFe12−xTixO19 with Titanium Gradient

Живулин, В.Е.; Trofimov, Evgeny; Зайцева, О.В.; Жеребцов, Д. А.; Uchaev, D. A.; Винник, Д.А.

doi:10.3390/cryst10040264

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…Pure barium ferrite has large saturation magnetization (M s ), high coercivity, magnetic anisotropy constants, and the large magnetic loss at the natural resonance frequency, which make barium ferrite have excellent microwave absorption characteristics [17,18]. To investigate larger RL, broader bandwidth, and even tunable microwave absorbing material, many kinds of research work on barium ferrite doping modification are carried out [19,20]. The magnetic loss is related to the content of Fe 3+ in barium ferrite, and thus the microwave absorption properties can be adjusted when Fe 3+ ions are substituted with other trivalent ions or combination of divalent and tetravalent ions [21].…”

Section: Introduction mentioning

confidence: 99%

A neutron diffraction investigation of high valent doped barium ferrite with wideband tunable microwave absorption

Hong

et al. 2022

J Adv Ceram

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The barium ferrite BaTixFe12−xO19 (x = 0.2, 0.4, 0.6, 0.8) (BFTO-x) ceramics doped by Ti4+ were synthesized by a modified sol—gel method. The crystal structure and magnetic structure of the samples were determined by neutron diffraction, and confirm that the BFTO-x ceramics were high quality single phase with sheet microstructure. With x increasing from 0.2 to 0.8, the saturation magnetization (Ms) decreases gradually but the change trend of coercivity (Hc) is complex under the synergy of the changed grain size and the magnetic crystal anisotropy field. Relying on the high valence of Ti4+, double resonance peaks are obtained in the curves of the imaginary part of magnetic conductivity (μ″) and the resonance peaks could move toward the low frequency with the increase of x, which facilitate the samples perform an excellent wideband modulation microwave absorption property. In the x = 0.2 sample, the maximum reflection loss (RL) can reach −44.9 dB at the thickness of only 1.8 mm, and the bandwidth could reach 5.28 GHz at 2 mm when RL is less than −10 dB. All the BFTO-x ceramics show excellent frequency modulation ability varying from 18 (x = 0.8) to 4 GHz (x = 0.4), which covers 81% of the investigated frequency in microwave absorption field. This work not only implements the tunable of electromagnetic parameters but also broadens the application of high-performance microwave absorption devices.

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Section: Introduction mentioning

confidence: 99%

A neutron diffraction investigation of high valent doped barium ferrite with wideband tunable microwave absorption

Hong

et al. 2022

J Adv Ceram

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“…占位的研究中 [97,[100][101][102][103]105] [118] ，移动溶剂浮区法 [119] ，助熔剂法 [120][121][122][123][124][125] 等，其中最常见的制备方法是助熔剂法。在此之前，已经有一些关于 SrM 中 Sr 或 Fe 晶位被另一种离子替代的单晶样品合成的报道 [61,[126][127][128][129][130][131][132][133][134][135][136][137][138][139] ，而 La-Co SrM 单晶(Sr La 和 Co 非等量替代的建议 [63,97] ，例如与 La 成分相比，当 Co 的含量略微降低时，磁体的性能更好。Liu 等 [141] 对 145 组 La-Co SrM 多晶样品的实验数据进行机器学习，研究了 La 和 Co 的成分与磁体性能之间的关系，结果也表明当 La 的含量大于 Co 含量时矫顽力更大。此外， 57 Fe 穆斯堡尔谱和化学滴定法 [104] 表明 [140] ，x>y 样品中的 La 3+ 电荷补偿由 Co 2+ 和 Fe 2+ 完成 75, respectively) [140] . Charge compensation for La 3+ in the sample x>y is accomplished by Co 2+ and Fe 2+…”

Section: 单晶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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Anisotropy of the electrical properties of a single crystal of BaFe11.25Ti0.75O19 M-type barium hexaferrite

Живулин

Зайцева

Trofimov

et al. 2021

Journal of Solid State Chemistry

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Flux Single Crystal Growth of BaFe12−xTixO19 with Titanium Gradient

Cited by 3 publications

References 24 publications

A neutron diffraction investigation of high valent doped barium ferrite with wideband tunable microwave absorption

A neutron diffraction investigation of high valent doped barium ferrite with wideband tunable microwave absorption

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

Anisotropy of the electrical properties of a single crystal of BaFe11.25Ti0.75O19 M-type barium hexaferrite

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