Enhanced energy storage performance of high entropy (1-x)(Na0.5Li0.5NbO3)-x(Sr0.5Bi0.5)(Fe0.5Ti0.25Zr0.25)O3 dielectric ceramics through non-equivalent ion doping

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

Ceramics International Pub Date : 2025-03-01 DOI:10.1016/j.ceramint.2024.12.353

Y.Q. Guo , Aditya Jain , H.Z. Zhou , Y.G. Wang

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引用次数: 0

Abstract

High entropy dielectric ceramics with excellent relaxation characteristics are ideal materials for pulse capacitors. In this study, a high entropy dielectric ceramic based on NaNbO₃ was engineered to enhance relaxation properties through non-equivalent ion substitution and increased entropy. The composition studied was (1-x)(Na_0.5Li_0.5NbO₃) - x(Sr_0.5Bi_0.5)(Fe_0.5Ti_0.25Zr_0.25)O₃ (NLN-SBFTZ) with x = 0, 0.15, 0.20, and 0.25. The introduction of non-equivalent ions (Sr_0.5Bi_0.5)^5/2+ and (Fe_0.5Ti_0.25Zr_0.25)^7/2+, significantly increases the configurational entropy (ΔS_config). With a breakdown field strength of 500 kV/cm, the modified ceramics sample (x = 0.20) shows a recoverable energy density (W_rec) of 4.70 J/cm³ and an energy efficiency (η) of 83.5 %, surpassing the performance of undoped samples (W_rec = 0.15 J/cm³, η = 43.2 %). These results confirm that the high entropy design strategy via non-equivalent ion doping effectively enhances the energy storage capabilities of lead-free dielectric materials.

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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.