Fe-doping as a universal phase boundary shifter for BCZT ceramics across the morphotropic phase boundary

IF 1.7 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Electroceramics Pub Date : 2021-09-18 DOI:10.1007/s10832-021-00265-4

Wenwei Ge, Mingze Gao, Chen Wu, Yu Fang, Changyi Liu, Hongwei Zhao, Hongming Yuan

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引用次数: 1

Abstract

y mol% Fe-doped Ba(Zr_0.2Ti_0.8)O₃—x mol%(Ba_0.7Ca_0.3)TiO₃ (abbreviated as yFe:BCZTx) ferroelectric ceramics with y = 0, 0.375, 0.75, and 1.5 across the morphotropic phase boundary (MPB) with x = 44 and 56 were fabricated via conventional solid state reaction methods. Fe incorporated into the lattice and all the yFe:BCZTx ceramics showed pure perovskite structure. Fe-doping can significantly reduce the grain sizes and shift the tetragonal-cubic phase boundary toward lower temperature for all the investigated compositions across the MPB. A moderate enhancement of frequency dispersion on the dielectric constant was observed. The temperature dependent dielectric constant was analyzed according to modified Curie–Weiss law and the diffuse factor increased with increasing Fe-doping content. Relaxor-like slim polarization–electric field (P-E) loops were obtained for all BCZTx ceramics after Fe-doping. 1.5Fe:BCZTx ceramics shows almost hysteresis free P-E loops without obvious fatigue behavior after 10,000 cycles. The recoverable energy storage efficiency was significantly enhanced in 1.5Fe:BCZTx ceramics with good temperature stability. Our results indicate Fe-doping can be used as a universal phase boundary shifter and to increase energy storage efficiency for BCZT ceramics.

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fe掺杂作为BCZT陶瓷相变相界的通用移相器

采用常规固相反应法制备了x = 44和56、y = 0、0.375、0.75和1.5的fe掺杂Ba(Zr0.2Ti0.8) O3-x mol%(Ba0.7Ca0.3)TiO3(简称yFe:BCZTx)铁电陶瓷。yFe:BCZTx陶瓷均呈现纯钙钛矿结构。fe掺杂能显著减小材料的晶粒尺寸，使其四方立方相边界向低温方向移动。频率色散对介电常数有中等程度的增强。根据修正的居里-魏斯定律分析了介电常数随温度的变化规律，发现扩散系数随fe掺杂量的增加而增加。所有的BCZTx陶瓷在fe掺杂后都获得了类似弛豫的细长极化电场(P-E)环。1.5Fe:BCZTx陶瓷经过1万次循环后，P-E环几乎没有迟滞，没有明显的疲劳行为。1.5Fe:BCZTx陶瓷的可回收储能效率显著提高，且具有良好的温度稳定性。我们的研究结果表明，fe掺杂可以作为一种通用的相边界移相器，并提高BCZT陶瓷的储能效率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.