Piezoelectric and ferroelectric properties of lead-free niobium-rich potassium lithium tantalate niobate single crystals
Piezoelectric and ferroelectric properties of lead-free niobium-rich potassium lithium tantalate niobate single crystals
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DOI：
10.1016/j.materresbull.2013.08.077
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发表时间：
2014
影响因子：
5.4
通讯作者：
Jun Li;Yang Li;Zhongxiang Zhou;R. Guo;A. Bhalla
中科院分区：
文献类型：
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作者：
Jun Li;Yang Li;Zhongxiang Zhou;R. Guo;A. Bhalla
采用顶部籽晶熔融生长法生长了无铅钽酸钾锂单晶，其组成为K0.95Li0.05Ta1− xNbxO 3（缩写为KLTN，x= 0.51，0.60，0.69，0.78）。系统地研究了它们在生长态晶体中的压电和铁电性能。通过介电和热释电测量确定相变和居里温度。得到了厚度模态、纵向模态和纵向模态下的压电系数和机电耦合系数。当x = 0.60时，k_1 = 70%，k_31 = 70%，k_33 = 77%，d_31 = 230 pC/N，d_33 = 600 pC/N，其压电性能可与铅基PZT材料相媲美。极化与电场的磁滞回线显示饱和的形状。总之，无铅富铥KLTN系统具有与当今重要的铅基压电材料中的那些性能相当的性能。
Lead-free potassium lithium tantalate niobate single crystals with the composition of K0.95Li0.05Ta1−xNbxO3(abbreviated as KLTN,x= 0.51, 0.60, 0.69, 0.78) were grown using the top-seeded melt growth method. Their piezoelectric and ferroelectric properties in as-grown crystals have been systematically investigated. The phase transitions and Curie temperatures were determined from dielectric and pyroelectric measurements. Piezoelectric coefficients and electromechanical coupling factors in thickness mode, length-extensional mode and longitudinal mode were obtained. The piezoelectric properties are very attractive, e.g. forx= 0.60 composition,kt≈ 70%,k31≈ 70%,k33≈ 77%,d31≈ 230 pC/N,d33≈ 600 pC/N are comparable to the lead-based PZT composition. The polarization versus electric field hysteresis loops show saturated shapes. In short, lead-free niobium-rich KLTN system possesses comparable properties to those in important lead-based piezoelectric material nowadays.