Modification of Bentonite Properties with Iron Oxide Nanoparticles

IF 0.4 Q4 PHYSICS, CONDENSED MATTER

Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2025-09-10 DOI:10.1134/S1027451025700417

A. V. Noskov, O. V. Alekseeva, D. N. Yashkova, A. V. Agafonov, M. N. Shipko, M. A. Stepovich, E. S. Savchenko

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Abstract

Powdered materials based on bentonite and a mixed solid solution magnetite/maghemite were synthesized by the chemical coprecipitation method. Scanning electron microscopy, X-ray phase analysis, magnetic measurements, and nuclear γ-resonance spectroscopy were used to characterize the surface and study the physicochemical properties of the resulting compounds. It has been found that bentonite affects the point defects in the magnetite/maghemite crystal lattice, as well as the crystallite size and dislocation density. It has been shown that samples of the bentonite/iron oxide composite are characterized by lower residual magnetization and higher values of the effective anisotropy field strength compared to those detected for Fe₃O₄/γ-Fe₂O₃ powder. Based on the Mössbauer spectroscopy data, a conclusion has been made about the localization of Fe²⁺ ions in the bentonite structure near oxygen vacancies that form octahedral positions.

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氧化铁纳米颗粒改性膨润土的研究

以膨润土和磁铁矿/磁铁矿混合固溶体为原料，采用化学共沉淀法合成粉体材料。利用扫描电子显微镜、x射线相分析、磁测量和核γ-共振波谱学对所得化合物的表面进行了表征，并研究了所得化合物的物理化学性质。研究发现，膨润土对磁铁矿/磁铁矿晶格中的点缺陷、晶粒尺寸和位错密度都有影响。结果表明，与Fe3O4/γ-Fe2O3粉末相比，膨润土/氧化铁复合材料样品具有较低的剩余磁化强度和较高的有效各向异性场强。根据Mössbauer光谱数据，得出了Fe2+离子在膨润土结构中形成八面体位置的氧空位附近的局部化结论。

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来源期刊

Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques PHYSICS, CONDENSED MATTER-

CiteScore

0.90

自引率

25.00%

发文量

144

审稿时长

3-8 weeks

期刊介绍： Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques publishes original articles on the topical problems of solid-state physics, materials science, experimental techniques, condensed media, nanostructures, surfaces of thin films, and phase boundaries: geometric and energetical structures of surfaces, the methods of computer simulations; physical and chemical properties and their changes upon radiation and other treatments; the methods of studies of films and surface layers of crystals (XRD, XPS, synchrotron radiation, neutron and electron diffraction, electron microscopic, scanning tunneling microscopic, atomic force microscopic studies, and other methods that provide data on the surfaces and thin films). Articles related to the methods and technics of structure studies are the focus of the journal. The journal accepts manuscripts of regular articles and reviews in English or Russian language from authors of all countries. All manuscripts are peer-reviewed.