2021年第68回応用物理学会春季学術講演会

講演情報

一般セッション(口頭講演)

9 応用物性 » 9.1 誘電材料・誘電体

[18p-Z16-1~16] 9.1 誘電材料・誘電体

2021年3月18日(木) 13:30 〜 18:00 Z16 (Z16)

塚田 真也(島根大)、上野 慎太郎(山梨大)、森本 貴明(防衛大)

17:30 〜 17:45

[18p-Z16-15] Evaluation of lead-free KNbO3 piezoelectric thin films for environmental and biosensor applications

〇(M2C)PhyuPhyu Khin Sin1,2、May Phyo Paing1,2、Thithi Lay1 (1.Dept. of Chem. Josai University. JP、2.Dept. of Phys. University of Yangon MM)

キーワード:KNbO_3 thin film, Electromechanical properties, Hydrothermal method

Recently, the development of lead-free piezoelectric materials for environmental and biosensor applications is in focus to replace PZT because of their lead content and production of hazardous lead oxide during fabrication process. In this research, a biocompatible lead-free piezoelectric KNbO3 film was grown on LiTaO3 single crystal by hydrothermal method and evaluates its electromechanical properties and piezoelectric properties. Linear two-dimensional finite element method (2D-FEM) was used prior to the experiment to estimate the values of electromechanical coupling coefficient (kt) and mechanical quality factor (Qm). KNbO3 film has acquired electromechanical coupling coefficient kt 0.37 calculated from response of impedance with frequency as shown in figure 1 and simulation result of kt was approximately 0.4. It also exhibits 22.4kV/cm coercive electric field and 8μC/cm2 remnant polarization without poling treatment and shows P-E hysteresis characteristics as in figure 2. Experiment and simulation results are comparable with PZT ceramic sensor values which are currently used in environmental and biosensor applications.