Lin Zirui, Zhu Zhe, Yao Zhonghua, Zhang Hao, Hao Hua, Cao Minghe, Liu Hanxing
School of Material Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
Sanya Science and Education Innovation Park of Wuhan University of Technology, Wuhan 430070, China.
Materials (Basel). 2023 Feb 17;16(4):1679. doi: 10.3390/ma16041679.
The preparation of low-cost multilayer piezoelectric devices requires using cheap internal electrodes between the dielectric layers. A general strategy is to reduce the sintering temperature of the ceramic layer by sintering aids which can form a liquid phase. Here, 0.2 wt% LiCO was added as a sintering aid to tailor the sinterability and piezoelectricity of the commercial PZT ceramics. As verified from experiments, the piezoelectric ceramics could be densified at a sintering temperature above 940 °C, suitable for co-firing with the cheap internal electrode. The optimized sintering temperature of 980 °C can be confirmed for the 0.2 wt% LiCO-modified PZT ceramics due to its high piezoelectric coefficient ~ 701 pC/N, planar coupling factor ~ 66.7%, and a low mechanical quality factor ~ 71 with a transition temperature of ~ 226 °C, presenting the characteristics of typical soft piezoelectric ceramics. Moreover, both the potential piezoelectric strain ~0.13% under 20 kV/cm and the good cycling fatigue characteristic (>10 cycles) of the studied piezo compositions indicates strong competitiveness in the field of multilayer piezoelectric devices.
制备低成本多层压电器件需要在介电层之间使用廉价的内部电极。一种通用策略是通过能形成液相的烧结助剂来降低陶瓷层的烧结温度。在此，添加0.2 wt%的LiCO作为烧结助剂，以调整商用PZT陶瓷的烧结性和压电性。实验证明，压电陶瓷在940℃以上的烧结温度下可致密化，适合与廉价内部电极共烧。对于0.2 wt% LiCO改性的PZT陶瓷，可确定其优化烧结温度为980℃，因其具有高压电系数701 pC/N、平面耦合因子66.7%、低机械品质因数71以及转变温度226℃，呈现出典型软压电陶瓷的特性。此外，所研究的压电组合物在20 kV/cm下的潜在压电应变~0.13%以及良好的循环疲劳特性（>10次循环）表明其在多层压电器件领域具有很强的竞争力。
