Sintering atmosphere modulated defect engineering in Na0.4K0.1Bi0.5TiO3-based relaxor ceramics toward temperature-stable energy storage

IF 5.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2025-05-22 DOI:10.1016/j.materresbull.2025.113563

Yu Qiu , Jiangbo Cao , Jiaze Wang , Rong Ma , Yating Yu , Xiaoting Zhang

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Abstract

Due to their rapid charge-discharge rates and high power density, dielectric ceramic materials exhibit significant application potential in pulsed power electronic systems. However, the inevitable compositional deviations and defect formation in ceramics during high-temperature sintering hinder further enhancement of their energy storage properties. In this paper, sintering atmosphere modulated defect engineering was adopted in Na_0.4K_0.1Bi_0.5TiO₃-based relaxor ceramics, so as to manipulate the defect form and their content toward temperature-stable energy storage. Results have verified that, defects engineering including oxygen vacancies and defect dipole could distinctly improve the breakdown strength and reduce the hysteresis loss, and modify the polarization switching behavior via the strengthened nanodomain induced relaxor feature. Ceramics sintered in a pure oxygen atmosphere achieve high W_rec of 3.66 J/cm³ and η of 91.7 %, along with wide dielectric temperature stability within 30–411 °C. This work provides an effective strategy to develop outstanding dielectric ceramics both in energy storage and temperature stability via defect engineering.

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面向温度稳定储能的na0.4 k0.1 bi0.5 tio3基弛豫陶瓷烧结气氛调制缺陷工程

介质陶瓷材料以其快速的充放电速率和较高的功率密度，在脉冲电力电子系统中具有重要的应用潜力。然而，陶瓷在高温烧结过程中不可避免的成分偏差和缺陷的形成阻碍了其储能性能的进一步提高。本文在na0.4 k0.1 bi0.5 tio3基弛豫陶瓷中采用了烧结气氛调制缺陷工程，以控制缺陷的形态和含量，实现温度稳定的储能。结果证实，氧空位和缺陷偶极子等缺陷工程可以明显提高击穿强度，降低迟滞损耗，并通过增强的纳米畴诱导弛豫特性改变极化开关行为。在纯氧气氛下烧结的陶瓷具有3.66 J/cm³的高Wrec和91.7%的η，并且在30-411℃范围内具有较宽的介电温度稳定性。这项工作为通过缺陷工程开发具有优异储能和温度稳定性的介质陶瓷提供了有效的策略。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.