Zheng Ting, Wu Jiagang, Cheng Xiaojing, Wang Xiaopeng, Zhang Binyu, Xiao Dingquan, Zhu Jianguo, Lou Xiaojie, Wang Xiangjian
Department of Materials Science, Sichuan University, Chengdu 610064, P. R. China.
Dalton Trans. 2014 Aug 14;43(30):11759-66. doi: 10.1039/c4dt01293c. Epub 2014 Jun 24.
In this work, we elucidate the influence of Bi(0.5)Li(0.5)ZrO3 (BLZ) content on the phase structure, microstructure, and electrical properties of (1 -x)K(0.40)Na(0.60)Nb(0.965)Sb(0.035)O3-xBi(0.5)Li(0.5)ZrO3 lead-free ceramics. We simultaneously achieved a giant d33 and a high T(C) in this material system. The coexistence of rhombohedral and tetragonal phases is responsible for such a large d33 in the ceramics with BLZ contents (x) ranging from 0.025 to 0.035. Doping with BLZ not only induces the formation of the phase boundary, but also maintains a high T(C). The ceramic with x = 0.03 shows an enhanced piezoelectric behaviour (d33 ~ 400 pC N(-1) and k(p) ~ 0.47) together with a high T(C) of 292 °C. A good temperature stability for ferroelectricity and piezoelectricity is also observed in these ceramics. This study is the first time that such a good comprehensive performance has been obtained in potassium-sodium niobate materials. We believe that this type of material system possessing giant-d33 and high-T(C) is a promising candidate for use in high-temperature piezoelectric devices.
在本工作中，我们阐明了Bi(0.5)Li(0.5)ZrO3（BLZ）含量对(1 -x)K(0.40)Na(0.60)Nb(0.965)Sb(0.035)O3-xBi(0.5)Li(0.5)ZrO3无铅陶瓷的相结构、微观结构和电学性能的影响。我们在该材料体系中同时实现了巨大的d33和较高的居里温度（Tc）。对于BLZ含量（x）在0.025至0.035范围内的陶瓷，菱方相和四方相的共存导致了如此大的d33。掺杂BLZ不仅诱导了相界的形成，还保持了较高的Tc。x = 0.03的陶瓷表现出增强的压电性能（d33 ~ 400 pC N(-1)，k(p) ~ 0.47）以及292 °C的高Tc。在这些陶瓷中还观察到了良好的铁电性和压电性的温度稳定性。本研究首次在铌酸钾钠材料中获得了如此良好的综合性能。我们认为这种具有巨大d33和高Tc的材料体系是用于高温压电器件的有前途的候选材料。
