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<p>Motivated by the increasing demand for advanced optoelectronic materials, this study investigates the structural, linear and nonlinear optical properties of La<sub>1−x</sub>Y<sub>x</sub>FeO<sub>3</sub> (x = 0, 0.025, 0.05, 0.10 and 0.15) synthesized via the sol–gel method. X-ray diffraction confirmed the stabilization of a single orthorhombic Pbnm phase across all compositions, while Rietveld refinement revealed a lattice contraction and progressive Fe–O–Fe bond-angle distortion induced by Y<sup>3+</sup> substitution. FTIR spectra exhibit two characteristic bands near 538&#xa0;cm<sup>− 1</sup> and 480&#xa0;cm<sup>− 1</sup>, consistent with the formation of the orthoferrite structure. UV–Vis diffuse reflectance measurements in the 200–800&#xa0;nm range enabled the determination of key optical parameters, including the absorption coefficient, band gap, Urbach energy, and threshold wavelength (<i>λ</i><sub><i>T</i></sub>). Dispersion parameters, including the single-oscillator energy (<i>E</i><sub><i>0</i></sub>), dispersion energy (<i>E</i><sub><i>d</i></sub>), static refractive index (<i>n</i><sub><i>0</i></sub>), zero-frequency dielectric constant (<i>ε</i><sub><i>op</i></sub>), and oscillator strength, were extracted using the Wemple–DiDomenico model. Analysis of the nonlinear optical properties revealed a marked improvement in both the third-order susceptibility and the nonlinear refractive index, with La<sub>0.90</sub>Y<sub>0.10</sub>FeO<sub>3</sub> exhibiting the highest values within the series. The optical conductivity for all samples reaches values on the order of 10<sup>15</sup> s<sup>− 1</sup>, and the optical dielectric parameters (<i>ε</i><sub><i>r</i></sub>, <i>ε</i><sub><i>i</i></sub>, <i>tanδ</i>) were also evaluated. These results indicate that La<sub>1−x</sub>Y<sub>x</sub>FeO<sub>3</sub> compounds exhibit favorable optical characteristics for potential integration into photonic and optoelectronic devices.</p>

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Structural Characteristics and Optical Properties of La1−xYxFeO3 Perovskites for Optoelectronic and Nonlinear Optical Applications

  • 期刊论文

  • 发表日期：

    2026年4月18日

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

摘要

Motivated by the increasing demand for advanced optoelectronic materials, this study investigates the structural, linear and nonlinear optical properties of La1−xYxFeO3 (x = 0, 0.025, 0.05, 0.10 and 0.15) synthesized via the sol–gel method. X-ray diffraction confirmed the stabilization of a single orthorhombic Pbnm phase across all compositions, while Rietveld refinement revealed a lattice contraction and progressive Fe–O–Fe bond-angle distortion induced by Y3+ substitution. FTIR spectra exhibit two characteristic bands near 538 cm− 1 and 480 cm− 1, consistent with the formation of the orthoferrite structure. UV–Vis diffuse reflectance measurements in the 200–800 nm range enabled the determination of key optical parameters, including the absorption coefficient, band gap, Urbach energy, and threshold wavelength (λT). Dispersion parameters, including the single-oscillator energy (E0), dispersion energy (Ed), static refractive index (n0), zero-frequency dielectric constant (εop), and oscillator strength, were extracted using the Wemple–DiDomenico model. Analysis of the nonlinear optical properties revealed a marked improvement in both the third-order susceptibility and the nonlinear refractive index, with La0.90Y0.10FeO3 exhibiting the highest values within the series. The optical conductivity for all samples reaches values on the order of 1015 s− 1, and the optical dielectric parameters (εr, εi, tanδ) were also evaluated. These results indicate that La1−xYxFeO3 compounds exhibit favorable optical characteristics for potential integration into photonic and optoelectronic devices.