Structural, optical and electrical properties of a mixed valence bismuth oxide δ-Bi2O3+x prepared by solid-liquid reaction

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2025-05-15 DOI:10.1016/j.optmat.2025.117162

A. Agnaou, W. Mhaira, R. Essalim, B. Tanouti, A. Ammar

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引用次数: 0

Abstract

Nano-metric δ-Bi₂O_3+x powders was successfully synthesized by solid-liquid reaction, at around room temperature. The resulting powders underwent comprehensive characterization using XRD, Raman, FT-IR, DTA/TG, SEM-EDS, and UV–vis techniques. X-ray diffraction (XRD) analysis confirms the existence of a cubic phase iso-structural to δ-Bi₂O₃. Chemical analysis shows that the obtained compound is bismuth oxide with mixed valence (trivalent and pentavalent bismuth). Heat treatment at increasing temperature in air shows that the synthesized compound is successively transformed into three crystalline forms isomorph to β- Bi₂O₃, α- Bi₂O₃ and γ- Bi₂O₃. The results of the DTA and TGA performed in air are in agreement with the XRD study. The synthesized powders exhibited a morphology characterized by spherical nanoparticle. UV–vis diffuse reflectance spectroscopy (DRS) indicates that the δ-Bi₂O_3+x phase has a bandgap energy of 1.86 eV. The highest electrical conductivity is obtained at 280 °C with a value close to 4 × 10⁻³ S cm⁻¹.

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固液反应制备混合价氧化铋δ-Bi2O3+x的结构、光学和电学性质

采用固液反应，在室温下成功合成了纳米级δ-Bi2O3+x粉体。采用XRD、Raman、FT-IR、DTA/TG、SEM-EDS、UV-vis等技术对所得粉体进行了综合表征。x射线衍射（XRD）分析证实了δ-Bi2O3存在立方相等结构。化学分析表明，所制化合物为混合价（三价和五价铋）的氧化铋。在空气中加温热处理表明，合成的化合物依次转变为β- Bi2O3、α- Bi2O3和γ- Bi2O3三种晶型。在空气中进行的DTA和TGA的结果与XRD的研究结果一致。合成的粉末具有球形纳米颗粒的形貌特征。紫外-可见漫反射光谱（DRS）表明，δ-Bi2O3+x相的能带能为1.86 eV。在280℃时电导率最高，接近4 × 10−3 S cm−1。

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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.