(K0.5Na0.5)0.94-2xLi0.06SrxNb0.98Sb0.02O3无铅压电陶瓷的制备及性能研究

doi:10.3724/SP.J.1077.2010.01164

无机材料学报 ›› 2010, Vol. 25 ›› Issue (11): 1164-1168.DOI: 10.3724/SP.J.1077.2010.01164 CSTR: 32189.14.SP.J.1077.2010.01164

(K_0.5Na_0.5)_0.94-2xLi_0.06Sr_xNb_0.98Sb_0.02O₃无铅压电陶瓷的制备及性能研究

初瑞清^1,2, 郝继功¹, 徐志军^1,2, 臧国忠^1,2

(聊城大学1. 材料科学与工程学院; 2. 新能源和环境材料工程中心, 聊城252059)

收稿日期:2010-03-12 修回日期:2010-04-28 出版日期:2010-11-20 网络出版日期:2010-11-01
基金资助:
国家自然科学基金(50702068, 50675218)

Preparation and Characterization of (K_0.5Na_0.5)_0.94-2xLi_0.06Sr_xNb_0.98Sb_0.02O₃ Lead-free Piezoelectric Ceramics

CHU Rui-Qing^1,2, HAO Ji-Gong¹, XU Zhi-Jun^1,2, ZANG Guo-Zhong^1,2

(1. College of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China; 2. Renewable Energy and Environment Materials Research Center, Liaocheng University, Liaocheng 252059, China)

Received:2010-03-12 Revised:2010-04-28 Published:2010-11-20 Online:2010-11-01
Supported by:
National Nature Science Foundation of China (50702068, 50675218)

摘要/Abstract

摘要： 采用传统陶瓷烧结工艺制备了(K_0.5Na_0.5)_0.94-2xLi_0.06Sr_xNb_0.98Sb_0.02O₃无铅压电陶瓷, 研究了陶瓷的结构、烧结特性及电性能特征. 研究结果表明: 制备的KNLSN-Sr_x陶瓷为单一的具有四方相的钙钛矿结构, SEM照片中可以看出材料的平均晶粒尺寸随着Sr掺入量的增加逐渐变大, 陶瓷的烧结温度随Sr掺入量的增加而升高, Li, Sr和Sb掺杂(K_0.5Na_0.5)NbO₃后, 材料的压电系数d₃₃、平面机电耦合系数kp得到提高, 同时介电损耗tanδ和机械品质因子Q_m降低, Sr掺入量在2mol%时各项性能最佳(d₃₃=130pC/N, k_p=34.5%, tanδ=4.2%).

关键词: 无铅压电陶瓷, 铌酸钾钠, 介电常数, 压电常数

Abstract: Lead-free (K_0.5Na_0.5)_0.94-2xLi_0.06Sr_xNb_0.98Sb_0.02O₃ (KNLSN-Sr_x; x=0-0.03) piezoelectric ceramics were prepared by conventional solid-state sintering process. The sintering characteristic, the microstructure, dielectric, piezoelectric and ferroelectric properties of KNLSN-Sr_x ceramics were investigated. XRD results show that all samples exhibite a pure perovskite phase with tetragonal symmetry, indicating that the Sr²⁺ has diffused into the KNLSN lattices to form a solid solution. The grain size of KNLSN-Sr_x ceramics was increased with the increasing of Sr-doping level. The proper sintering temperature of KNLSN-Sr_x ceramics shifted to higher temperature with increasing the content of Sb. Higher d₃₃ and kp, lower tanδ and Qm were obtained as Li, Sr and Sb were added into KNN ceramics. The comprehensive good properties of doped (K_0.5Na_0.5)NbO₃ ceramics were obtained when Sr content was 2mol% (d₃₃=130pC/N, k_p=34.5%, tanδ=4.2%).

Key words: lead free piezoelectric, sodium potassium niobate, dielectric constant, piezoelectric constant

中图分类号:

TN379

初瑞清, 郝继功, 徐志军, 臧国忠. (K_0.5Na_0.5)_0.94-2xLi_0.06Sr_xNb_0.98Sb_0.02O₃无铅压电陶瓷的制备及性能研究[J]. 无机材料学报, 2010, 25(11): 1164-1168.

CHU Rui-Qing, HAO Ji-Gong, XU Zhi-Jun, ZANG Guo-Zhong. Preparation and Characterization of (K_0.5Na_0.5)_0.94-2xLi_0.06Sr_xNb_0.98Sb_0.02O₃ Lead-free Piezoelectric Ceramics[J]. Journal of Inorganic Materials, 2010, 25(11): 1164-1168.

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(K_0.5Na_0.5)_0.94-2xLi_0.06Sr_xNb_0.98Sb_0.02O₃无铅压电陶瓷的制备及性能研究

Preparation and Characterization of (K_0.5Na_0.5)_0.94-2xLi_0.06Sr_xNb_0.98Sb_0.02O₃ Lead-free Piezoelectric Ceramics

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