Effect of heating rate on ion diffusion and dielectric properties of ferroelectric-dielectric composite ceramics

IF 1.7 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Electroceramics Pub Date : 2023-11-17 DOI:10.1007/s10832-023-00338-6

He Zhang, Mingwei Zhang, Le Xin, Xianxin Zhang, Jiwei Zhai

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Abstract

The ion diffusion phenomenon in ferroelectric-dielectric composite ceramics will deteriorate its dielectric properties. In this paper, Ba_0.5Sr_0.5TiO₃-CuGa₂O₄ composite ceramics were prepared at different sintering heating rates. The phase composition, microstructure and dielectric properties were tested and analyzed. The effects of grain growth and the different degrees of ion diffusion on the properties of ferroelectric-dielectric composite ceramics at various heating rates were studied. The results show two crystal phases including perovskite structure BST and spinel structure GuGa₂O₄ in the composite ceramics. With the increase of the heating rate, the dielectric permittivity decreased, the tunability showed a decreasing trend, and the Q value also appeared to decrease after a slight increase. The inhomogeneity of grain size is apparent when the heating rate is higher. Moreover, as the grain size heterogeneity increases, the density decreases, adversely affecting the dielectric property of the samples.

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升温速率对铁电-介电复合陶瓷离子扩散及介电性能的影响

铁电-介电复合陶瓷中的离子扩散现象会使其介电性能恶化。本文以不同的烧结升温速率制备了Ba0.5Sr0.5TiO3-CuGa2O4复合陶瓷。对其相组成、微观结构和介电性能进行了测试和分析。研究了不同升温速率下晶粒生长和不同离子扩散程度对铁电介质复合陶瓷性能的影响。结果表明，复合陶瓷中存在钙钛矿结构BST和尖晶石结构GuGa2O4两种晶相。随着升温速率的增大，介质介电常数减小，可调性呈减小趋势，Q值也呈现先升高后降低的趋势。升温速率越高，晶粒尺寸的不均匀性越明显。此外，随着晶粒尺寸不均一性的增加，密度降低，对样品的介电性能产生不利影响。

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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.