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IF 2.5 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2025-02-20 DOI:10.1016/j.jmmm.2025.172896

A.Yu. Mironovich , V.G. Kostishin , H.I. Al-Khafaji , E.S. Savchenko , A.I. Ril , R.I. Shakirzyanov , M.A. Sysoev

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引用次数: 0

摘要

本研究采用水热法制备了 BaFe12-xCrxO19 和 BaFe12-xAlxO19（x = 0.0、0.1、0.3 和 0.4）粉末，随后进行了退火处理。元素分析和 X 射线衍射图样的里特维尔德细化结果表明，随着 x 值的增加，晶格体积减小，这证实了六铁氧体结构中加入了铬和铝。随着取代度的增加，Al 取代的六价铁的磁性参数略有不同，这可能是由于 Al3+ 的掺入量有限。同时，在铬取代的样品中观察到 Hc 显著下降（x = 0 时为 5629 Oe，x = 0.4 时为 2092 Oe）。电子显微镜显示，用 Al3+ 替代 Fe3+ 对晶体形态没有明显影响。用 Cr3+ 替代 Fe3+ 会导致六价铁的板状晶粒变薄和变宽。这可能是矫顽力下降的原因之一。

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Influence of Al or Cr substitution on structure and magnetic properties of barium hexaferrites prepared by hydrothermal method

In this study, BaFe_12-xCr_xO₁₉ and BaFe_12-xAl_xO₁₉ (x = 0.0, 0.1, 0.3 and 0.4) powders were prepared by a hydrothermal method followed by annealing. The incorporation of Cr and Al in the hexaferrite structure was confirmed by elemental analysis and the results of Rietveld refinement of X-ray diffraction patterns, which revealed a decrease in the lattice volume with increasing x. Based on Mössbauer spectroscopy and magnetic measurements, the lack of Fe³⁺ was observed in the 12k site for BaFe_12-xAl_xO₁₉ samples and in the 12k, 4f₁ and 4f₂ sites for BaFe_12-xCr_xO₁₉ samples. With increasing substitution, the magnetic parameters of Al-substituted hexaferrites varied slightly, possibly due to limited incorporation of Al³⁺. At the same time, a significant decrease in H_c was observed for Cr-substituted samples (5629 Oe for x = 0 and 2092 Oe for x = 0.4). Electron microscopy revealed that the substitution of Fe³⁺ with Al³⁺ had no significant effect on crystallite morphology. The substitution of Fe³⁺ with Cr³⁺ leads to the thinning and widening of the plate-like grains of hexaferrite. This could be one of the reasons for the decrease in coercivity.

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来源期刊

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.