Light-induced modulation of EPR signals in Bi25FeO40 sillenite

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2025-10-20 DOI:10.1016/j.optmat.2025.117608

F.A. Páez-Reyes , L. Zipa-Romero , O. Almanza , E. Padrón-Hernández , J. Roa-Rojas , M. Cabrera-Baez , D.A. Landinez-Tellez

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Abstract

This work explores the magnetic and optical behavior of Bi₂₅FeO₄₀ (iron sillenite) using X-band Electron Paramagnetic Resonance (EPR) spectroscopy under variable temperature and light conditions. The material, synthesized via solid-state reaction, was structurally characterized through X-ray diffraction and scanning electron microscopy, confirming the formation of a cubic polycrystalline sillenite phase. The EPR spectra revealed two main resonances at approximately 308 mT (g ∼ 2.0) and 330 mT (g ∼ 2.15). Under external UV illumination, a selective and progressive suppression of the 330 mT resonance was primarily observed at 365 nm. These effects indicate the presence of light-sensitive paramagnetic centers and suggest a coupling between structural distortions and light-induced charge-transfer mechanisms. Our findings highlight the complex interplay between lattice geometry, spin states, and optical excitation in Bi₂₅FeO₄₀, supporting its potential for magneto-optical and photocatalytic applications.

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Bi25FeO40硅矿中EPR信号的光诱导调制

本研究利用x波段电子顺磁共振（EPR）光谱研究了Bi25FeO40（铁硅辉石）在变温度和变光条件下的磁性和光学行为。通过固相反应合成的材料，通过x射线衍射和扫描电镜对其结构进行了表征，证实其形成了立方多晶硅辉石相。EPR谱显示了两个主要的共振，大约在308 mT （g ~ 2.0）和330 mT （g ~ 2.15）。在外部紫外线照射下，在365 nm处主要观察到330 mT共振的选择性和渐进式抑制。这些效应表明存在光敏顺磁中心，并表明结构畸变和光诱导电荷转移机制之间存在耦合。我们的发现强调了Bi25FeO40中晶格几何、自旋态和光激发之间复杂的相互作用，支持了其在磁光和光催化应用方面的潜力。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.