Impact of interfacial coupling on the structural, magnetic, and dielectric properties of CoFe2O4/NiO nanocomposites

IF 4.9 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of Physics and Chemistry of Solids Pub Date : 2025-09-16 DOI:10.1016/j.jpcs.2025.113195

R.A.O. Pinto , J.C.R. Araújo , R.B. Silva , A.L.R. Souza , A. Ferreira , Y. Abbas , P.C. Albuquerque , J. Xavier , C.A.M. Iglesias , J.M. Soares , M.V.S. da Silva , M.A. Morales , M.A. Correa , E.F. Silva , F. Bohn

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引用次数: 0

Abstract

We report the synthesis and comprehensive characterization of CoFe

_{2}

_{4}

/NiO nanocomposites prepared via a modified co-precipitation method followed by thermal treatment. Structural and morphological analyses confirm the coexistence of pure CoFe

_{2}

_{4}

and NiO phases with well-defined interfaces. Mössbauer spectroscopy indicates a partially inverted spinel structure. Magnetic measurements revealed particle-size-dependent magnetic ordering, and a transition from single- to multi-domain behavior with increasing particle size, and strong interfacial effects, including exchange bias and wasp-waisted hysteresis loops, as evidenced by

Δ H

vs.

M

plots. AC susceptibility shows frequency-dependent peaks in the imaginary component, with Vogel–Fulcher analysis suggesting cluster-glass-like behavior due to strong interphase interactions. Dielectric measurements demonstrate a marked enhancement of the dielectric constant in the composites, attributed to interfacial polarization at the CoFe

_{2}

_{4}

/NiO boundary. These findings highlight the critical role of interfacial coupling in tailoring the multifunctional properties of oxide-based nanocomposites.

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界面耦合对CoFe2O4/NiO纳米复合材料结构、磁性和介电性能的影响

本文报道了采用改进共沉淀法制备CoFe2O4/NiO纳米复合材料，并对其进行了综合表征。结构和形态分析证实了纯CoFe2O4和NiO相共存，界面明确。Mössbauer光谱分析表明尖晶石结构部分倒置。通过ΔH vs. M图可以看出，磁性测量揭示了颗粒大小相关的磁性有序，随着颗粒大小的增加，从单畴到多畴的行为转变，以及强烈的界面效应，包括交换偏置和黄蜂腰磁滞回圈。交流磁化率在虚分量中显示出频率相关的峰值，Vogel-Fulcher分析表明，由于强相间相互作用，团簇玻璃样行为。介电测量表明，复合材料的介电常数明显增强，这是由于CoFe2O4/NiO边界处的界面极化。这些发现强调了界面耦合在调整氧化物基纳米复合材料的多功能特性中的关键作用。

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 Physics and Chemistry of Solids 工程技术-化学综合

CiteScore

7.80

自引率

2.50%

发文量

605

审稿时长

40 days

期刊介绍： The Journal of Physics and Chemistry of Solids is a well-established international medium for publication of archival research in condensed matter and materials sciences. Areas of interest broadly include experimental and theoretical research on electronic, magnetic, spectroscopic and structural properties as well as the statistical mechanics and thermodynamics of materials. The focus is on gaining physical and chemical insight into the properties and potential applications of condensed matter systems. Within the broad scope of the journal, beyond regular contributions, the editors have identified submissions in the following areas of physics and chemistry of solids to be of special current interest to the journal: Low-dimensional systems Exotic states of quantum electron matter including topological phases Energy conversion and storage Interfaces, nanoparticles and catalysts.