High-Temperature Piezoelectric Response and Thermal Stability of BiGaO<sub>3</sub> Modified BiFeO<sub>3</sub>–BaTiO<sub>3</sub> Lead-Free Piezoelectric Ceramics
Shibo Guan,
Huabin Yang,
Shuai Cheng,
Hua Tan,
Guanjun Qiao,
Qiaohong Chen,
Jiwen Xu,
Linna Yuan,
Xueting Wang,
Ling Yang
Affiliations
Shibo Guan
Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China
Huabin Yang
Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China
Shuai Cheng
Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China
Hua Tan
School of Materials Science and Engineering, State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China
Guanjun Qiao
School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China
Qiaohong Chen
Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China
Jiwen Xu
Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China
Linna Yuan
Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China
Xueting Wang
Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China
Ling Yang
Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China
BiGaO3 doped BiFeO3–BaTiO3 ceramics were prepared by the traditional solid-phase synthesis process. The phase analysis, microstructure, piezoelectric, ferroelectric, dielectric properties, and thermal stability of 0.7BiFeO3-(0.3 − x)BaTiO3-xBiGaO3 (Abbreviated as BF–BT-xBG) were investigated. The results show that the ceramics have rhombohedral (R) and tetragonal (T) structures. Particle dimensions gradually get bigger with the increase of BiGaO3 concentration, and dense ceramic grains were observed through SEM. Electrical properties of BF–BT-xBG are improved after adding a small amount of BiGaO3: piezoelectric constants d33 = 141 pC/N, electromechanical coupling coefficient kp = 0.314, mechanical Quality Factor Qm = 56.813, dielectric loss tanδ = 0.048, residual polarization intensity Pr = 18.3 µC/cm2, Curie temperature Tc = 485.2 °C, depolarization temperature Td = 465 °C for x = 0.003. The “temperature-piezoelectric performance” curve under in situ d33 indicates that piezoelectric properties d33 increase rapidly with increasing temperature. Remarkably, the piezoelectric response d33 reaches a maximum of 466 pC/N at a temperature T = 340 °C, and afterward, reduces gradually to zero with increasing temperature until 450 °C.
