Impact of bismuth substitution on the structural and optical properties of lanthanum orthoferrite synthesized via sol-gel method

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

Optical Materials Pub Date : 2025-03-28 DOI:10.1016/j.optmat.2025.117010

Ahmed Belguenoune , Nadir Ouldhamadouche , Salah Bassaid , Abdelkader Dehbi , Abdallah Ben Rhaiem

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Abstract

This study explores the structural, linear, and nonlinear optical properties of lanthanum orthoferrite (LaFeO₃) and the impact of bismuth (Bi) substitution at the A-site in varying concentrations (0.05, 0.1, and 0.15) on these properties. The La_1-xBixFeO₃ samples were synthesized via the sol-gel method using citric acid as a complexing agent. Structural characterization was conducted using X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR). XRD analysis confirmed the formation of a perovskite phase with an orthorhombic structure (Pbnm space group), while Rietveld refinement provided precise crystallographic and geometric parameters. FTIR spectra verified the phase purity, revealing no detectable carboxyl or hydroxyl functional groups, indicating the absence of carbonates and minimal hygroscopicity. UV–visible spectroscopy was employed to assess absorbance and reflectance spectra, Which indicated enhanced absorption in the visible region upon doping. The calculated linear optical parameters stated an increase in bandgap energy from 2.045 eV to 2.139 eV with increasing Bi content, accompanied by a reduction in Urbach energy. Furthermore, Bi-doped samples exhibited anomalous dispersion behavior in the refractive index, in contrast to the normal dispersion observed in undoped LaFeO₃. Dielectric properties, optical performance, and electrical conductivity were also improved upon Bi incorporation. The nonlinear optical analysis, including third-order nonlinear susceptibility (χ(3)) and nonlinear refractive index—enables, revealed that pristine LaFeO₃ exhibited superior optical characteristics compared to Bi-doped samples.

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铋取代对溶胶-凝胶法制备的正铁氧体镧结构和光学性能的影响

本研究探讨了镧正铁氧体（LaFeO3）的结构、线性和非线性光学性质，以及不同浓度（0.05、0.1和0.15）下a位铋（Bi）取代对这些性质的影响。以柠檬酸为络合剂，采用溶胶-凝胶法制备了La1-xBixFeO3样品。利用x射线衍射（XRD）和傅里叶变换红外光谱（FTIR）对结构进行了表征。XRD分析证实形成了具有正交结构（Pbnm空间群）的钙钛矿相，而Rietveld细化提供了精确的晶体学和几何参数。FTIR光谱验证了相纯度，没有检测到羧基或羟基官能团，表明没有碳酸盐和最小的吸湿性。紫外可见光谱法测定了材料的吸光度和反射光谱，结果表明掺杂后材料在可见光区吸收增强。计算的线性光学参数表明，随着Bi含量的增加，带隙能量从2.045 eV增加到2.139 eV，同时伴有乌尔巴赫能量的降低。此外，与未掺杂LaFeO3的正常色散相比，双掺杂样品的折射率表现出异常色散行为。掺入铋后，材料的介电性能、光学性能和电导率也得到了改善。非线性光学分析，包括三阶非线性磁化率（χ(3)）和非线性折射率使能，表明与双掺杂样品相比，原始LaFeO3具有优越的光学特性。

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

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.