Tunning the dielectric and energy storage properties of high entropy ceramics (Bi0.2Na0.2K0.2La0.2Sr0.2)(Ti1-xScx)O3 by Sc-doping at B-site in perovskite structure

IF 1.7 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Electroceramics Pub Date : 2022-08-04 DOI:10.1007/s10832-022-00292-9

Wentao Yang, Guangping Zheng

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引用次数: 8

Abstract

The (Bi_0.2Na_0.2K_0.2La_0.2Sr_0.2)(Ti_1-xSc_x)O₃ (BNKLST-xSc) high entropy ceramics (HECs) have been successfully synthesized via a citrate acid method. The effects of Sc-doping on the lattice structure, microstructural morphology, dielectric and energy-storage properties of HECs are comprehensively investigated. The results indicate that although Sc³⁺ doped at B-site does not alternate the perovskite structure of BNKLST with a single phase, it results in lattice expansion and weakened bonding in TiO₆ octahedron. The dielectric constant of BNKLST-xSc is reduced while the dielectric relaxation is enhanced with increasing Sc content x, due to the enhanced structural inhomogeneity in nano-regions. In addition, the lattice structure of BNKLST-0.2Sc exhibits ultra-high thermal stability at 30–300 °C, which achieves the maximum energy storage density of 1.094 J/cm³ with an outstanding efficiency better than 80%, accompanying by the mechanical and dielectric losses as low as ~ 10^–3. It is suggested that BNKLST-0.2Sc could be promising dielectric materials in capacitors and energy-storage devices with an excellent combination of ultrahigh power density, high energy density, thermal stability as well as low mechanical and dielectric losses.

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在钙钛矿结构的b位掺杂sc调控高熵陶瓷(Bi0.2Na0.2K0.2La0.2Sr0.2)(Ti1-xScx)O3的介电和储能性能

采用柠檬酸法制备了(Bi0.2Na0.2K0.2La0.2Sr0.2)(Ti1-xScx)O3 (BNKLST-xSc)高熵陶瓷(HECs)。全面研究了sc掺杂对HECs晶格结构、微观结构形态、介电性能和储能性能的影响。结果表明，虽然在b位掺杂Sc3+不会使BNKLST的钙钛矿结构与单相交替，但会导致TiO6八面体的晶格膨胀和键结减弱。随着Sc含量的增加，BNKLST-xSc的介电常数降低，而介电弛豫增强，这是由于纳米区结构不均匀性增强所致。此外，BNKLST-0.2Sc的晶格结构在30-300℃时表现出超高的热稳定性，最大储能密度为1.094 J/cm3，效率优于80%，机械损耗和介电损耗低至~ 10-3。结果表明，BNKLST-0.2Sc具有超高功率密度、高能量密度、热稳定性以及低机械损耗和介电损耗等优点，是一种很有前途的电容器和储能器件介质材料。

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来源期刊

Journal of Electroceramics 工程技术-材料科学：硅酸盐

CiteScore

2.80

自引率

5.90%

发文量

审稿时长

5.7 months

期刊介绍： While ceramics have traditionally been admired for their mechanical, chemical and thermal stability, their unique electrical, optical and magnetic properties have become of increasing importance in many key technologies including communications, energy conversion and storage, electronics and automation. Electroceramics benefit greatly from their versatility in properties including: -insulating to metallic and fast ion conductivity -piezo-, ferro-, and pyro-electricity -electro- and nonlinear optical properties -feromagnetism. When combined with thermal, mechanical, and chemical stability, these properties often render them the materials of choice. The Journal of Electroceramics is dedicated to providing a forum of discussion cutting across issues in electrical, optical, and magnetic ceramics. Driven by the need for miniaturization, cost, and enhanced functionality, the field of electroceramics is growing rapidly in many new directions. The Journal encourages discussions of resultant trends concerning silicon-electroceramic integration, nanotechnology, ceramic-polymer composites, grain boundary and defect engineering, etc.