Sol-gel fabricated barium M-type hexaferrites: Effect of high cobalt doping on the structural, optical, surface, and magnetic traits of BaFe12O19 hexaferrites

IF 3.2 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology Pub Date : 2025-07-14 DOI:10.1007/s10971-025-06861-y

Himanshi, Rohit Jasrotia, Basant Lal, Natrayan Lakshmaiya, Jahangeer Ahmed, Ashwani Sood, Suman, Abhishek Kandwal, Saad M. Alshehri

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Abstract

In this research work, cobalt-doped barium hexaferrites of composition, Ba_1-xCo_xFe₁₂O₁₉ (x = 0.2, 0.4, and 0.6) are fabricated via the sol-gel auto-combustion (SGC) method to investigate the morphological, structural, optical, surface, and magnetic traits. This research is performed to analyze the effect of the high cobalt doping at the lattice sites of barium cations. The magneto-plumbite crystal structure with a small trace of α-Fe₂O₃ is confirmed via the XRD analysis. An increase in the values of crystallite size is observed with the increasing cobalt doping. FESEM show the formation of well-defined surface morphology with the aggregated grains. The mesoporous structure of cobalt doped barium hexaferrites are confirmed through the BET analysis. The existence of nine Raman active vibrational modes shows the formation of hexagonal structure for the prepared barium hexaferrites. The oxidation states of every element present in the synthesised specimens are confirmed by the XPS analysis. At room temperature, with the increasing cobalt doping, the values of coercivity (H_c) and saturation magnetisation (M_s) decreases from 2368 to 1542 Oe and 43.11 to 25.12 emu/g. Therefore, in this research work, the admirable values of M_s, H_c, and surface area are making these hexaferrites as the useful candidate for the recording media and environmental applications.

Graphical Abstract

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溶胶-凝胶法制备钡m型六铁体：高钴掺杂对BaFe12O19六铁体结构、光学、表面和磁性的影响

本研究采用溶胶-凝胶自燃烧（SGC）法制备了Ba1-xCoxFe12O19 （x = 0.2, 0.4和0.6）的掺钴钡六铁体，研究了其形态、结构、光学、表面和磁性等特性。本研究分析了高钴掺杂对钡离子晶格位的影响。XRD分析证实了磁铅石晶体结构中含有少量α-Fe2O3。晶体尺寸随钴掺杂量的增加而增加。FESEM显示晶粒聚集形成了清晰的表面形貌。通过BET分析证实了钴掺杂钡六铁体的介孔结构。九种拉曼主动振动模式的存在表明所制备的钡六铁氧体形成了六边形结构。合成样品中存在的每种元素的氧化态都通过XPS分析得到证实。室温下，随着钴掺杂量的增加，合金矫顽力（Hc）和饱和磁化强度（Ms）分别从2368 ~ 1542 Oe和43.11 ~ 25.12 emu/g下降。因此，在本研究工作中，Ms、Hc和表面积的令人钦佩的价值使这些六铁氧体成为记录介质和环境应用的有用候选者。图形抽象

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来源期刊

Journal of Sol-Gel Science and Technology 工程技术-材料科学：硅酸盐

CiteScore

4.70

自引率

4.00%

发文量

280

审稿时长

2.1 months

期刊介绍： The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.