Bound magnetic polarons, phonon confinement and charge transfer effects in Cr2O3/SiO2 composites

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences Pub Date : 2025-04-25 DOI:10.1016/j.solidstatesciences.2025.107943

Akshay Kumar , Mohit K. Sharma , Naveen Yadav , Ankush Vij , Manish Kumar , Seok-Hwan Huh , Jong-Woo Kim , Bon Heun Koo

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Abstract

Cr₂O₃/SiO₂ composites with varying Cr₂O₃ content (10 %, 30 %, and 50 %) were synthesized and systematically analyzed for their structural, vibrational, chemical, and magnetic properties. X-ray diffraction (XRD) confirmed the successful incorporation of Cr₂O₃ into the SiO₂ matrix, with a gradual increase in Cr₂O₃ phase fraction and a minor shrinkage in lattice volume, indicative of strong interparticle interactions. Raman spectra exhibited a systematic redshift and peak broadening in the characteristic Cr₂O₃ mode, indicative of interfacial strain and phonon confinement, while Raman mapping revealed phase clustering at higher Cr₂O₃ content. X-ray photoelectron spectroscopy (XPS) identified a higher Cr⁶⁺ fraction at increased Cr₂O₃:SiO₂ fractions, indicating enhanced Cr-O-Si interactions. Magnetic measurements at 50 K and 300 K demonstrated dominant antiferromagnetic behavior alongside weak ferromagnetic contributions, attributed to defect-induced bound magnetic polarons (BMPs). BMP density increased with Cr₂O₃ content, highlighting localized spin interactions at the Cr₂O₃/SiO₂ interface. These findings elucidate the interplay of structural stability, charge transfer, and defect-mediated magnetism, offering insights for optimizing Cr₂O₃/SiO₂ composites in spintronic, magneto-optical, and catalytic applications.

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Cr2O3/SiO2复合材料中的束缚磁极化子、声子约束和电荷转移效应

合成了不同Cr2O3含量（10%、30%和50%）的Cr2O3/SiO2复合材料，并对其结构、振动、化学和磁性进行了系统分析。x射线衍射（XRD）证实了Cr2O3成功地掺入到SiO2基体中，Cr2O3相分数逐渐增加，晶格体积略有缩小，表明颗粒间相互作用强。在Cr2O3特征模式下，拉曼光谱表现出系统的红移和峰展宽，表明界面应变和声子约束，而在Cr2O3含量较高时，拉曼映射显示出相簇。x射线光电子能谱（XPS）发现，Cr2O3:SiO2组分增加时，Cr6+组分增加，表明Cr-O-Si相互作用增强。在50 K和300 K下的磁测量显示出主要的反铁磁行为以及弱铁磁贡献，归因于缺陷诱导的束缚磁极化子（BMPs）。BMP密度随Cr2O3含量的增加而增加，表明Cr2O3/SiO2界面上的自旋相互作用具有局域性。这些发现阐明了结构稳定性、电荷转移和缺陷介导的磁性之间的相互作用，为优化Cr2O3/SiO2复合材料在自旋电子、磁光和催化方面的应用提供了见解。

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来源期刊

Solid State Sciences 化学-无机化学与核化学

CiteScore

6.60

自引率

2.90%

发文量

214

审稿时长

27 days

期刊介绍： Solid State Sciences is the journal for researchers from the broad solid state chemistry and physics community. It publishes key articles on all aspects of solid state synthesis, structure-property relationships, theory and functionalities, in relation with experiments. Key topics for stand-alone papers and special issues: -Novel ways of synthesis, inorganic functional materials, including porous and glassy materials, hybrid organic-inorganic compounds and nanomaterials -Physical properties, emphasizing but not limited to the electrical, magnetical and optical features -Materials related to information technology and energy and environmental sciences. The journal publishes feature articles from experts in the field upon invitation. Solid State Sciences - your gateway to energy-related materials.