Maghemite and hematite nanowires synthesized by nanocasting: precursor effects on structural and magnetic properties

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

Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-10 DOI:10.1016/j.jmmm.2025.173288

Natalia I. Cuello , Emiliano G. Fornasin , Marcos I. Oliva , Gerardo F. Goya , Gustavo Marchetti , Griselda A. Eimer , Verónica R. Elías

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引用次数: 0

Abstract

Mesoporous iron oxides with tailored structural and magnetic properties were synthesized using the SBA-15 silica template and two different iron precursors: Fe(NO₃)₃·9H₂O and Fe(C₅H₇O₂)₃, denoted as FeM-1 and FeM-2, respectively. The synthesis involved a two-step impregnation-calcination process followed by silica removal. Comprehensive characterization was performed using techniques such as nitrogen adsorption–desorption isotherms, TEM, SEM-EDX, XRD, XPS, and Mössbauer spectroscopy, as well as magnetic measurements.

The results revealed significant differences in structural and magnetic properties between the two samples. FeM-1 exhibited higher structural order, greater homogeneity, and a single-phase α-Fe₂O₃ composition, whereas FeM-2 showed a bimodal pore size distribution and a dual-phase composition of α-Fe₂O₃ and ɣ-Fe₂O₃. Magnetic characterization indicated enhanced magnetization in FeM-2 due to the ferrimagnetic nature of ɣ-Fe₂O₃, while FeM-1 displayed lower magnetization consistent with the weak ferromagnetic behavior of α-Fe₂O₃. The combination of structural and magnetic analyses demonstrated the critical role of precursor selection in tuning the material properties for potential applications in catalysis and magnetic devices.

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纳米铸造制备磁铁矿和赤铁矿纳米线：前驱体对结构和磁性能的影响

采用SBA-15硅模板和两种不同的铁前驱体Fe(NO3)3·9H2O和Fe(C5H7O2)3（分别记为FeM-1和FeM-2），合成了具有定制结构和磁性能的介孔氧化铁。该合成包括两步浸渍-煅烧过程，然后去除二氧化硅。利用氮吸附-解吸等温线、TEM、SEM-EDX、XRD、XPS、Mössbauer光谱以及磁测量等技术进行了全面的表征。结果表明，两种样品在结构和磁性方面存在显著差异。FeM-1具有较高的结构有序性、均匀性和单相α-Fe2O3组成，而FeM-2具有双峰型孔径分布和α-Fe2O3和α-Fe2O3的双相组成。磁性表征表明，由于α-Fe2O3的弱铁磁性，FeM-2的磁化强度增强，而FeM-1的磁化强度较低，这与α-Fe2O3的弱铁磁性一致。结构和磁性分析的结合证明了前驱体选择在调整材料性能方面的关键作用，这些材料具有催化和磁性器件的潜在应用。

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 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.