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

Yongxing Wei; Changqing Jin; Yiming Zeng; Xiaotao Wang; Gang Xu; Xiaoli Wang

doi:10.3390/ma8125462

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

Materials (Basel). 2015 Dec 2;8(12):8355-8365. doi: 10.3390/ma8125462.

Authors

Yongxing Wei¹, Changqing Jin², Yiming Zeng³, Xiaotao Wang⁴, Gang Xu⁵, Xiaoli Wang⁶

Affiliations

¹ School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China. weiyongxing@xatu.edu.cn.
² School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China. eaglejin@xatu.edu.cn.
³ Sate Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, China. zym@ipm.com.cn.
⁴ MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter, School of Science, Xi'an Jiaotong University, Xi'an 710049, China. In.01211@stu.xjtu.edu.cn.
⁵ School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China. xugang@xatu.edu.cn.
⁶ MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter, School of Science, Xi'an Jiaotong University, Xi'an 710049, China. xlwang1@mail.xjtu.edu.cn.

Abstract

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 %.

Keywords: BiFeO3; morphotropic phase boundary; piezoelectric.