Dielectric and piezoelectric properties of（110） oriented Pb（Zr_（1-x）Ti_x）O_3 thin films

• Published in: 中国物理B：英文版 2016 (5), p.357-362
• Main Author: 邱建华 陈智慧 王秀琴 袁宁一 丁建宁
• Format: Article
• Language: English
• Subjects: 剩余极化强度; 压电性能; 压电系数; 取向; 热力学势; 相对介电常数; 薄膜; 非线性耦合
• ISSN: 1674-1056; 2058-3834

A phenomenological Landau–Devonshire theory is developed to investigate the ferroelectric, dielectric, and piezoelectric properties of（110） oriented Pb（Zr_（1-x）Ti_x）O_3（x = 0.4, 0.5, 0.6, and 0.7） thin films. At room temperature, the tetragonal a_1 phase, the orthorhombic a_2c phase, the triclinic γ_1 phase, and the triclinic γ_2 phase are stable. The appearance of the negative polarization component P_2 in the a_2c phase and the γ_1 phase is attributed to the nonlinear coupling terms in the thermodynamic potential. The γ phase of the Pb（Zr_（1-x）Ti_x）O_3 thin films has better dielectric and piezoelectric properties than the a_2c phase and the a_1 phase. The largest dielectric and piezoelectric coefficients are obtained in the Pb（Zr_（0.5）Ti_（0.5））O_3 thin film. The piezoelectric coefficient of 110–150 pm/V is obtained in the（110） oriented Pb（Zr_（0.5）Ti_（0.5））O_3 thin film, and the Pb（Zr_（0.3）Ti_（0.7））O_3 thin film has the remnant polarization and relative dielectric constant of 50 μC/cm~2 and 100, respectively,which are in agreement with the experimental measurements reported in the literature.