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<p>Lanthanum doped K<sub>0.5</sub>(Bi<sub>1−x</sub> a<sub>x</sub>)<sub>0.5</sub>TiO<sub>3</sub> at x = 0.0, 0.1, 0.2, and 0.3 ceramics are prepared by using solution based sol-gel route. The effect of lanthanum doping on structural and optical parameters of K<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> ceramics has been investigated systematically. X-ray diffraction analysis confirmed the formation of perovskite phase crystallized in tetragonal structure (space group P4mm) and incorporation of lanthanum ions in the crystal lattice. Raman study reveals significant changes in vibrational mode of lanthanum doped KBT ceramics with increase in lanthanum ions concentrations. The various optical parameters such as optical band gap, Urbach energy, refractive index and extinction coefficient have been investigated by using UV-visible spectroscopy. The direct optical bandgap of ceramics are analysed by using Tauc’s plots and decrease with increase in lanthanum ions concentration.</p><p></p>

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Effect of lanthanum doping on structural and optical properties of K0.5Bi0.5TiO3 ceramics prepared by sol–gel technique

  • 期刊论文

  • 发表日期：

    2025年7月24日

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  • Saloni Bhardwaj,
  • Shammi Kumar,
  • Nagesh Thakur

摘要

Lanthanum doped K0.5(Bi1−x ax)0.5TiO3 at x = 0.0, 0.1, 0.2, and 0.3 ceramics are prepared by using solution based sol-gel route. The effect of lanthanum doping on structural and optical parameters of K0.5Bi0.5TiO3 ceramics has been investigated systematically. X-ray diffraction analysis confirmed the formation of perovskite phase crystallized in tetragonal structure (space group P4mm) and incorporation of lanthanum ions in the crystal lattice. Raman study reveals significant changes in vibrational mode of lanthanum doped KBT ceramics with increase in lanthanum ions concentrations. The various optical parameters such as optical band gap, Urbach energy, refractive index and extinction coefficient have been investigated by using UV-visible spectroscopy. The direct optical bandgap of ceramics are analysed by using Tauc’s plots and decrease with increase in lanthanum ions concentration.