Dipolar-glass-like relaxor ferroelectric behaviour in the 0.5BaTiO3-0.5Bi(Mg1/2Ti1/2)O3 electroceramic

作者：Wang, Jian; Liu, Yun^*; Li, Qian; Lau, Kenny; Withers, Ray L.; Li, Zhenrong; Xu, Zhuo

来源：Applied Physics Letters, 2013, 103(4): 042910.

DOI：10.1063/1.4816741

• LOCAL CRYSTAL-CHEMISTRY
• STRUCTURED DIFFUSE-SCATTERING
• DIELECTRIC-PROPERTIES
• SPECTROSCOPY
• PYROCHLORES
• CERAMICS
• BZN

In this study, the dielectric and ferroelectric switching behaviour of 0.5BaTiO(3)-0.5Bi(Mg1/2Ti1/2)O-3 (BT-BMT) ceramics are investigated. The BT-BMT ceramic exhibits a typical dipolar-glass-like, dielectric polarisation relaxation. This is attributed to the 15 distinct possible local A(4)B(2) configurations around the O ions and the effect this unavoidable local compositional variability has on the dipole relaxation behaviour of inherent 1-D < 111 > dipole chains, arising from correlated off-centre displacements of Bi3+ and Ti4+ ions along local < 111 > directions. On the other hand, switchable polarisation under strong applied electric fields is observed on different length scales accompanied by the appearance of strong polarisation relaxation, as observed via time-delayed piezoresponse hysteresis loop measurements. These experimental results demonstrate that this BT-BMT ceramic is relaxor ferroelectric in nature, although it exhibits dipolar-glass-like dielectric relaxation behaviour.

• 出版日期2013-7-22
• 单位西安交通大学