Phase separation phenomenon and densification process in (K, Na)NbO3 ceramics indued by microcrystalline template

IF 2.7 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Electroceramics Pub Date : 2025-09-17 DOI:10.1007/s10832-025-00431-y

Qiang Zhang, Liangliang Liu, Yan Wang, Zezheng Yan, Zhaoping Hou

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引用次数: 0

Abstract

The tape casting combined with lamination process was developed to prepare dense (K, Na)NbO₃ ceramics without any sintering additives by alignment of columnar NaNbO₃ template in a matrix of K_0.5Na_0.5NbO₃ powder. A phase separation phenomenon was observed in matrix due to the induction of template epitaxial growth. The effects of template layer content on densification process and electric properties of the (K, Na) NbO₃ ceramics were investigated in detail. It was found that the relative density increased with the increase of template content. Multiple peaks appeared in the dielectric temperature spectrum and Curie temperatures of the (K, Na) NbO₃ ceramics increased from 306 ℃ to 343 ℃ with the decrease of template content. The high piezoelectric constant (165 pC/N) and remanent polarization (22 µC/cm²) could mainly attributed to the response of interface polarization between K-rich and other phases. This work provides a new way for the preparation of high-performance piezoelectric ceramics by inducing heterogeneous interface.

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微晶模板诱导（K, Na）NbO3陶瓷的相分离现象及致密化过程

以K0.5Na0.5NbO3粉末为基体，采用带铸与层压相结合的方法制备了致密（K, Na）NbO3陶瓷。由于模板外延生长的诱导，在基体中观察到相分离现象。研究了模板层含量对（K, Na） NbO3陶瓷致密化过程和电性能的影响。结果表明，相对密度随模板含量的增加而增大。随着模板含量的降低，（K, Na） NbO3陶瓷的介电温度谱出现多峰，居里温度从306℃升高到343℃。高压电常数（165 pC/N）和剩余极化（22µC/cm2）主要归因于富k相与其他相之间的界面极化响应。本研究为诱导非均相界面制备高性能压电陶瓷提供了一条新途径。

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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.