Li补偿量对铌酸盐基无铅压电陶瓷结构和性能的影响

doi:10.3724/SP.J.1077.2012.00385

无机材料学报 ›› 2012, Vol. 27 ›› Issue (4): 385-389.DOI: 10.3724/SP.J.1077.2012.00385 CSTR: 32189.14.SP.J.1077.2012.00385

Li补偿量对铌酸盐基无铅压电陶瓷结构和性能的影响

李海涛^1,2, 张波萍², 文九巴¹, 许荣辉¹, 李谦¹

(1. 河南科技大学材料科学与工程学院, 洛阳471003; 2. 北京科技大学材料科学与工程学院, 北京100083)

收稿日期:2011-05-18 修回日期:2011-06-22 出版日期:2012-04-10 网络出版日期:2012-03-12
基金资助:
国家自然科学基金(50972012);河南科技大学博士科研启动基金(09001542);河南科技大学实验技术开发基金(SY1011005)

Influence of Compensated Li Content on Microstructure, Crystalline Phase and Electrical Properties of NKN-based Lead-free Piezoelectric Ceramics

LI Hai-Tao^1,2, ZHANG Bo-Ping², WEN Jiu-Ba¹, XU Rong-Hui¹, LI Qian¹

(1. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China; 2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China)

Received:2011-05-18 Revised:2011-06-22 Published:2012-04-10 Online:2012-03-12
Supported by:
National Natural Science Foundation of China (50972012);Start-up Fund Dr of Henan University of Science and Technology (09001542);The Fund for Expriment Technology Development of Henan University of Science and Technology (SY1011005)

摘要/Abstract

摘要：

采用传统固相烧结工艺, 在1000℃成功制备了致密度较高、微观形貌较好的Li_0.05+_x(Na_0.535K_0.48)_0.95NbO₃(L_xNKN)压电陶瓷. 考察了Li补偿量对L_xNKN陶瓷致密度、微观结构、相结构、居里温度及电学性能的影响. 结果发现: 添加过量Li不仅促进陶瓷的烧结, 而且降低陶瓷的烧结温度. XRD图谱分析和相应的晶格常数计算表明, 在x=0.010~0.015范围内出现了四方-正交两相共存的多形态相界(PPT). 由于PPT的出现, 在最佳补偿量x=0.015处, 陶瓷的压电常数d₃₃、机电耦合系数k_p、介电常数ε_r和剩余极化强度P_r分别达到各自的最大值282 pC/N、44%、942和27 μC/cm². 与化学计量比的LNKN陶瓷相比, L_xNKN陶瓷的居里温度随Li补偿量的增加变化很小, 这可能是由于Li主要是起助烧作用而进入主相晶格很少的缘故. 研究工作为低温制备高性能铌酸盐系压电陶瓷提供了一种新的思路.

关键词: 传统固相烧结, 无铅压电陶瓷, 多形态相界, 铌酸盐基

Abstract:

High dense Li_0.05+_x(Na_0.535K_0.48)_0.95NbO₃(L_xNKN) lead-free piezoelectric ceramics with fine morphology were synthesised by conventional mixed-oxide method at 1000℃, and its microstructure, phase structure and electrical properties were investigated as a function of excessive Li addition. The results revealed that the excess Li content facilitated the sinterability and improved the piezoelectric properties for L_xNKN ceramics. A PPT bridging tetragonal and orthorhombic symmetry was found at x= 0.01-0.015 by using the X-ray diffraction patterns and the corresponding calculation of lattice parameters. Owing to such transitional behavior, the piezoelectric coefficient (d₃₃), electromechanical coupling coefficient (k_p), dielectric constant (ε_r) and remanent polarization (P_r) were enhanced to peak values, 282 pC/N, 44%, 942 and 27 μC/cm², respectively. Compared with LNKN ceramics, the variation in Curie temperature (T_c) by the compensation amount of Li was much smaller for L_xNKN ceramics. The reason is that the amount of Li that entered into crystal lattice is relatively rare for L_xNKN ceramics. The results provide a way to low-temperature sintering of LNKN-based lead-free piezoceramics with high performance.

Key words: traditional solid-phase sintering, lead-free piezoelectric ceramics, PPT, niobate-based

中图分类号:

TB34

李海涛, 张波萍, 文九巴, 许荣辉, 李谦. Li补偿量对铌酸盐基无铅压电陶瓷结构和性能的影响[J]. 无机材料学报, 2012, 27(4): 385-389.

LI Hai-Tao, ZHANG Bo-Ping, WEN Jiu-Ba, XU Rong-Hui, LI Qian. Influence of Compensated Li Content on Microstructure, Crystalline Phase and Electrical Properties of NKN-based Lead-free Piezoelectric Ceramics[J]. Journal of Inorganic Materials, 2012, 27(4): 385-389.

图/表 8

图1 LxNKN陶瓷的热腐蚀表面SEM照片 (a) x=0; (b) x=0.01; (c) x=0.02; (d) x=0.03

Fig. 1 SEM images of the thermally etched surface of the LxNKN ceramics

图2 LxNKN陶瓷的密度和相对密度

Fig. 2 Measured density and relative density of LxNKN ceramics

图3 LxNKN陶瓷的(a) 20°~60°; (b) 30°~33°XRD图谱

Fig. 3 XRD patterns in the 2θ range of 20°-60° (a) and 30°-33° (b) for the LxNKN ceramics

图4 LxNKN陶瓷的晶格常数

Fig. 4 Lattice parameters of LxNKN ceramics

图5 LxNKN陶瓷的介电常数随温度的变化关系

Fig. 5 Temperature dependence of dielectric constant (εr) of LxNKN ceramics with x=0, 0.010, 0.015 and 0.020 at 10 kHz

图6 LxNKN陶瓷的(a)压电性能和(b)介电性能

Fig. 6 Piezoelectric coefficient (d33) and electromechanical coupling factors ( kP) (a), dielectric constant (ε r) and loss (tanδ) (b) of LxNKN ceramics

图7 LxNKN陶瓷的电滞回线

Fig. 7 P-E hysteresis loops of LxNKN ceramics

图8 LxNKN陶瓷的剩余极化强度Pr和矫顽场Ec

Fig. 8 The remanent polarization Pr and coercive field Ec of LxNKN ceramics

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Li补偿量对铌酸盐基无铅压电陶瓷结构和性能的影响

Influence of Compensated Li Content on Microstructure, Crystalline Phase and Electrical Properties of NKN-based Lead-free Piezoelectric Ceramics

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