Dielectric and piezoelectric properties of non-stoichiometric (K_0.5Na_0.5)(Nb_0.9+xTa_0.1)O₃ ceramics

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• 作者：K.S. Lee ; J.H. Yoo ; ^{juhyun57@semyung.ac.kr}
• 关键词：Lead-free ; Non-stoichiometry ; Mechanical quality factor (Qm) ; Electomechanical coupling factor (kp) ; NKN-based
• 刊名：Current Applied Physics
• 出版年：2012
• 期刊代码：15_15671739
• 类别：ph
• 出版时间：May, 2012
• 卷：12
• 期：3
• 页码：798-802
• 文件大小：743 K

摘要

In the study, in order to develop the lead-free piezoelectric ceramics for actuator, transformer and other electronic-devices application, (K_0.5Na_0.5)(Nb_0.9+xTa_0.1)O₃聽+聽0.5聽mol%CuO聽+聽0.2聽mol%MnO₂ ceramics were prepared by conventional mixed oxide method. The effects of B-site non-stoichiometry in [(K_0.5Na_0.5)] [(Nb_0.9+xTa_0.1)O₃] ceramics on microstructure and piezoelectric properties were investigated. The density, electromechanical coupling factor (k_p), mechanical quality factor (Q_m), piezoelectric constant (d₃₃), T_C and T_O-T of NKNT ceramics with x聽=聽0.0065 showed the optimum values of 4.58聽g/cm³, 0.427, 1554, 109聽pC/N, 373聽掳C and 226聽掳C, respectively, suitable for piezoelectric motor, and transformer applications.