Polar Order Evolutions near the Rhombohedral to Pseudocubic and Tetragonal to Pseudocubic Phase Boundaries of the BiFeO3-BaTiO3 System

Materials

Yongxing Wei¹  Changqing Jin¹  Yiming Zeng²  Xiaotao Wang³  Gang Xu¹  Xiaoli Wang³ 

[1] School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an 710021, China;Sate Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, China;MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter, School of Science, Xi’an Jiaotong University, Xi’an 710049, China;

关键词: morphotropic phase boundary;    piezoelectric;    BiFeO₃;   

DOI  :  10.3390/ma8125462

来源: mdpi

【 摘 要 】

Solid solutions of (1-x)BiFeO₃-xBaTiO₃ (BF-BT, 0.05 ≤ x ≤ 0.98) were prepared and characterized. It was found that the dielectric constant ε_m, remnant polarization P_r and piezoelectric coefficient d₃₃ reach their maximum values near the rhombohedral–pseudocubic phase boundary. In particular, the 0.7BF-0.3BT composition shows large polarization (P_r > 20 μC/cm²) and a temperature-stable piezoelectric property (d₃₃ > 100 pC/N when the annealing temperature is lower than ~400 °C). Near the tetragonal–pseudocubic phase boundary, ε_m and P_r decrease, and the piezoelectric property vanishes when the BF content reaches 4 mol %.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.