Structure and electrical properties in CuO-modified BCZT lead-free piezoelectric ceramics

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

Journal of Electroceramics Pub Date : 2022-12-09 DOI:10.1007/s10832-022-00298-3

Jianzhou Du, Long Qiu, Cong Yang, Hongjuan Zheng, Kongjun Zhu, Luming Wang

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引用次数: 1

Abstract

Ba_0.85Ca_0.15Zr_0.1Ti_0.9O₃-x wt% CuO (BCZT-xCu) lead-free piezoelectric ceramics were designed and synthesized using a traditional solid-state reaction method to improve both the relaxor behavior and the electrical properties of BCZT lead-free piezoelectric ceramics. The Cu²⁺ diffuses into the BCZT lattice and forms ABO₃ perovskite solid solution. Additionally, X-ray diffraction patterns and Raman spectra reveal that the introduction of CuO causes phase transition from the O-T phase coexistence to the O phase in BCZT-xCu. SEM displays that BCZT-xCu has a well microstructure at CuO doping amount between 0.5 wt% and 1 wt%. With the increasing CuO content, the orthorhombic-tetragonal (T_O-T) phase transition shifted towards higher temperature, while Curie temperature (T_c) shifted towards lower temperature. Moreover, the dielectric diffusivity γ increases from 1.63 to 1.92 as x increases. Results indicate that optimal electrical properties, namely d₃₃ = 315 pC/N, k_p = 34%, ε_r = 3213, tanδ = 2.71%, P_r = 7.45 µC/cm² and E_c = 2.75 kV/cm are achieved in the 1 wt% CuO added ceramic sintered at 1250°C for 2 h.

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cuo改性BCZT无铅压电陶瓷的结构与电学性能

采用传统固相反应法设计合成了Ba0.85Ca0.15Zr0.1Ti0.9O3-x wt% CuO (BCZT- xcu)无铅压电陶瓷，改善了BCZT无铅压电陶瓷的弛豫性能和电学性能。Cu2+扩散到BCZT晶格中，形成ABO3钙钛矿固溶体。此外，x射线衍射图和拉曼光谱显示，CuO的引入导致BCZT-xCu从O- t相共存转变为O相共存。SEM结果表明，当CuO掺杂量在0.5 wt% ~ 1 wt%之间时，BCZT-xCu具有良好的微观结构。随着CuO含量的增加，正交四方相变(TO-T)向高温方向转变，居里温度(Tc)向低温方向转变。此外，随着x的增加，介质扩散系数γ从1.63增加到1.92。结果表明:添加量为1 wt%的CuO在1250℃下烧结2 h，陶瓷的电学性能为d33 = 315 pC/N, kp = 34%， εr = 3213, tanδ = 2.71%， Pr = 7.45µC/cm2, Ec = 2.75 kV/cm。

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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.