具有 Bi(In1/2(Li0.5Ta0.5)1/2)O3 修饰的 A 位空位调制 BaTiO3 陶瓷的相组成、介电性能和储能性能

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2024-09-30 DOI:10.1016/j.ceramint.2024.09.392

Dan Xu , Xinyuan Zhou , Taolin Yu , Jiale Wei , Fujia Ben , Wenjie Zhao

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引用次数: 0

摘要

基于 A 位空位设计和缺陷偶极子工程，探索了 (1-x)Ba0.94Ce0.04TiO3-xBi(In1/2(Li0.5Ta0.5)1/2)O3 （BCT-BILT）弛豫铁电陶瓷体系。研究并详细讨论了不同掺杂浓度对 BCT-BILT 陶瓷的相组成、介电和储能性能的影响。纯 BCT 和 0.95BCT-0.05BILT 样品呈现出四方（T）相和假立方（PC）相的混合晶体结构，而 x > 0.05 的 BCT-BILT 样品则具有立方（C）相，并伴有 BaBi2Ta2O9 和 BaTa2O6 的次生相。随着 BILT 掺杂浓度的增加，陶瓷的表面形貌不断发生变化，1 kHz 时的介电损耗降低到 0.001，这有利于提高储能性能。与纯 BCT 相比，由于 Aurivillius 相 BaBi2Ta2O9 的形成和介电弛豫的增加，击穿场强显著增强。最终，在 130 kV/cm 的小电场下，x = 0.05 的成分实现了最高的储能密度 Wrec = 0.7 J/cm3，以及高能量转换效率 η = 95 %。此外，由于缺陷偶极子、杂质 BaBi2Ta2O9 和极性纳米区域（PNRs）的协同作用，x = 0.20-0.30 的样品在 30-120 °C 温度范围内具有良好的温度稳定性，ΔWrec/Wrec30°C < 9 % 和 Δηη/η30°C < 6.5 %。0.95BCT-0.05BILT 陶瓷在 60 kV/cm 时的放电能量密度 Wdis 为 0.35 J/cm3，快速放电速度 t0.9 为 312 ns，在 80 kV/cm 时的电流密度 CD 为 255.4 A/cm2 ，功率密度 PD 为 10.2 MW/cm3。这项工作从缺陷构建和工程学的角度出发，对设计和优化无铅弛豫器的储能性能具有指导意义。

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The phase composition, dielectric, and energy storage performance of A-site vacancy modulated BaTiO3 ceramics with Bi(In1/2(Li0.5Ta0.5)1/2)O3 modification

The (1-x)Ba_0.94Ce_0.04TiO₃-xBi(In_1/2(Li_0.5Ta_0.5)_1/2)O₃ (BCT-BILT) relaxor ferroelectric ceramic system was explored based on the A-site vacancy design and defect dipole engineering. The impacts of different doping concentrations on the phase composition, dielectric and energy storage performance of the BCT-BILT ceramics were studied and discussed in detail. The pure BCT and 0.95BCT-0.05BILT samples exhibited a mixed crystal structure of tetragonal (T) and pseudo-cubic (PC) phase, while the BCT-BILT samples with x > 0.05 possessed a cubic (C) phase, accompanied by the secondary phases of BaBi₂Ta₂O₉ and BaTa₂O₆. With an increase in the BILT doping concentration, the surface morphologies of the ceramics were continuously modulated, and the dielectric loss had been reduced to 0.001 at 1 kHz, which was beneficial to improve the energy storage properties. Compared to the pure BCT, the breakdown field strength was significantly enhanced owing to the formation of Aurivillius phase BaBi₂Ta₂O₉ and the increased dielectric relaxation. Ultimately, the highest energy storage density of W_rec = 0.7 J/cm³ and high energy conversion efficiency of η = 95 % was realized at the composition of x = 0.05 under a small electric field of 130 kV/cm. Furthermore, the good temperature stability with the ΔW_rec/W_rec30°C < 9 % and Δη/η_30°C < 6.5 % was acquired for the samples with x = 0.20–0.30 in the temperature range of 30–120 °C, owing to the synergistic roles of the defect dipoles, impurities BaBi₂Ta₂O₉, and polar nanoregions (PNRs). The 0.95BCT-0.05BILT ceramic obtains discharge energy density W_dis of 0.35 J/cm³ and fast discharge speed t_0.9 of 312 ns at 60 kV/cm, current density C_D of 255.4 A/cm² and power density P_D of 10.2 MW/cm³ at 80 kV/cm. This work is of guiding significance for designing and optimizing energy storage performance of lead-free relaxors from the perspective of defect building and engineering.

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.