Embedded ferrihydrite nanoparticles in a SiO2 medium with enhanced superparamagnetic blocking temperature

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Ceramics International Pub Date : 2025-02-01 Epub Date: 2024-11-30 DOI:10.1016/j.ceramint.2024.11.473

Yuriy V. Knyazev , Viktor L. Kirillov , Aleksandr A. Krasikov , Stanislav A. Skorobogatov , Dmitry A. Velikanov , Mikhail N. Volochaev , Ekaterina D. Smorodina , Oleg A. Bayukov , Oleg N. Martyanov , Dmitry A. Balaev

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Abstract

The composite material based on the ferrihydrite nanoparticles (5Fe₂O₃ · 9H₂O) encapsulated in SiO₂ matrix was synthesized. Synthesized sample has been characterized by transmission electron microscopy, room-temperature ⁵⁷Fe Mössbauer spectroscopyand X-ray photoelectron spectroscopy. The data obtained have shown (i) the presence of isolated ferrihydrite nanoparticles with an average size of ∼4.3 nm in the SiO₂ matrix and (ii) the complete absence of the nanoparticles binding with the SiO₂ matrix. The temperature dependences of the ac and dc magnetization, as well as the temperature evolution of the Mössbauer spectra point out only the occurrence of the superparamagnetic blocking with decreasing temperature. The analysis of the relaxation time of particle magnetic moments have shown no magnetic interactions in the investigated system. A detailed examination of the magnetization curves has revealed that the non-interacted ferrihydrite nanoparticles formed by two magnetic subsystems: paramagnetic surface spins and the magnetically ordered core. Such magnetic morphology results in the significantly decrease of the anisotropy constant (K = 18 ∙ 10⁵ erg/cm³) compared to interacted nanoparticles. At the same time, a decisive role in the magnetic behavior of the material is played by the subsystem of free spins, which involves about half of all iron atoms on the particle surface.

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在超顺磁阻断温度增强的SiO2介质中嵌入水合铁纳米颗粒

合成了以二氧化硅为基体包封的水合铁纳米颗粒（5Fe2O3·9H2O）为基体的复合材料。用透射电镜、室温57Fe Mössbauer能谱和x射线光电子能谱对合成的样品进行了表征。获得的数据表明：(i)在SiO2基体中存在平均尺寸为~ 4.3 nm的分离的水合铁纳米颗粒，（ii）纳米颗粒完全不与SiO2基体结合。交流和直流磁化的温度依赖性以及Mössbauer光谱的温度演化表明，随着温度的降低，会出现超顺磁阻塞。对粒子磁矩弛豫时间的分析表明，所研究的体系中不存在磁相互作用。对磁化曲线的详细研究表明，非相互作用的水合铁纳米颗粒由两个磁性子系统组成：顺磁表面自旋和磁有序核。与相互作用的纳米颗粒相比，这种磁性形态导致各向异性常数（K = 18∙105 erg/cm3）显著降低。与此同时，自由自旋子系统在材料的磁性行为中起着决定性的作用，它涉及粒子表面约一半的铁原子。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.