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

IF 3.2 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology Pub Date : 2025-07-24 DOI:10.1007/s10971-025-06873-8

Saloni Bhardwaj, Shammi Kumar, Nagesh Thakur

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引用次数: 0

Abstract

Lanthanum doped K_0.5(Bi_1−x a_x)_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 K_0.5Bi_0.5TiO₃ 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.

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镧掺杂对溶胶-凝胶法制备K0.5Bi0.5TiO3陶瓷结构和光学性能的影响

采用溶胶-凝胶法制备了x = 0.0、0.1、0.2、0.3时掺杂镧的K0.5(Bi1−x ax)0.5TiO3陶瓷。系统地研究了镧掺杂对K0.5Bi0.5TiO3陶瓷结构和光学参数的影响。x射线衍射分析证实钙钛矿相形成四方结构（空间群P4mm），并在晶格中掺入镧离子。拉曼光谱研究表明，随着镧离子浓度的增加，掺镧KBT陶瓷的振动模式发生了显著变化。利用紫外可见光谱法研究了各种光学参数，如光学带隙、乌尔巴赫能、折射率和消光系数。利用Tauc图分析了陶瓷的直接光学带隙，其带隙随镧离子浓度的增加而减小。

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来源期刊

Journal of Sol-Gel Science and Technology 工程技术-材料科学：硅酸盐

CiteScore

4.70

自引率

4.00%

发文量

280

审稿时长

2.1 months

期刊介绍： The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.