Enhanced room-temperature ferromagnetism and tuned band gap in AlCoO3-modified lead-free Bi0.5Na0.5TiO3

IF 3.2 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Sol-Gel Science and Technology Pub Date : 2025-03-03 DOI:10.1007/s10971-025-06690-z

Nguyen Huu Lam, Dang Duc Dung

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Abstract

Lead-free Bi_0.5Na_0.5TiO₃ modified with AlCoO₃ was synthesized via a chemical method. The effects of AlCoO₃ incorporation on the crystal structure, optical properties, and magnetic behavior of Bi_0.5Na_0.5TiO₃ were systematically investigated. The incorporation of Al and Co cations into the Bi_0.5Na_0.5TiO₃ lattice during solid-solution formation induced lattice distortions. In addition, a significant reduction in the optical band gap energy, from 3.07 eV for pure Bi_0.5Na_0.5TiO₃ to 2.24 eV for Bi_0.5Na_0.5TiO₃ containing 9 mol.% AlCoO₃ was also observed. Furthermore, magnetic measurements revealed that pure Bi_0.5Na_0.5TiO₃ exhibited weak ferromagnetism with prominent diamagnetic contributions at room temperature. With increasing AlCoO₃ concentration, the magnetic response transitioned to typical ferromagnetism. At higher AlCoO₃ concentrations, the magnetic behavior became more complex, displaying a combination of ferromagnetic, paramagnetic, and/or antiferromagnetic-like characteristics. These results demonstrate the successful integration of magnetic functionalities into lead-free ferroelectric materials, offering new possibilities for their use in multifunctional applications.

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alcoo3修饰无铅Bi0.5Na0.5TiO3的室温铁磁性增强和带隙调谐

采用化学方法合成了AlCoO3修饰的无铅Bi0.5Na0.5TiO3。系统研究了AlCoO3掺入对Bi0.5Na0.5TiO3晶体结构、光学性能和磁性能的影响。在固溶形成过程中，Al和Co阳离子掺入Bi0.5Na0.5TiO3晶格引起晶格畸变。此外，光学带隙能量显著降低，从纯Bi0.5Na0.5TiO3的3.07 eV降至含有9 mol Bi0.5Na0.5TiO3的2.24 eV。也观察到% AlCoO3。此外，磁性测量表明，纯Bi0.5Na0.5TiO3在室温下表现出弱铁磁性，具有明显的抗磁性贡献。随着AlCoO3浓度的增加，磁性响应转变为典型的铁磁性。在较高的AlCoO3浓度下，磁性行为变得更加复杂，表现出铁磁性，顺磁性和/或反铁磁性的组合特征。这些结果表明磁性功能成功集成到无铅铁电材料中，为其在多功能应用中的应用提供了新的可能性。图形抽象

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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.