1. Effects of quenching on domain switching and electric field-induced phase transformations in Na0.5Bi0.5TiO3-NaNbO3 ceramics.
- Author
-
Pan, Juncheng, Li, Yizhe, Yang, Ziqi, Xie, Bingying, Shi, Jiajun, and Hall, David A.
- Subjects
- *
FERROELECTRIC materials , *X-ray diffraction measurement , *BISMUTH titanate , *ELECTRIC switchgear , *ELECTRIC fields - Abstract
Quenching from high temperatures has been identified as a useful means to enhance the piezoelectric properties and thermal stability of bismuth-based perovskite ferroelectrics. In the present work, it is demonstrated that quenching leads to improvement of depolarization temperature, ferroelectric and piezoelectric properties in Na 0.5 Bi 0.5 TiO 3 -NaNbO 3 (NBT-0.1NN) ceramics. In-situ synchrotron x-ray diffraction measurements indicated an irreversible transformation from cubic to coexisting cubic and rhombohedral phases during the application of a high electric field, for both as-sintered and quenched ceramics. These results confirm the non-ergodic relaxor ferroelectric nature of the materials. DC poling induced a transformation to single-phase rhombohedral structure in both cases, with highly textured domain configurations. These well-oriented ferroelectric domain states were relatively stable under subsequent bipolar electric field cycling. For the pre-poled NBT-0.1NN ceramics, the quenched samples were found to exhibit the highest intrinsic (lattice strain) and extrinsic (domain switching) contributions to electrostrain, due to the increased rhombohedral distortion. • High energy x-ray diffraction is used to analyse the structure of NBT-NN ceramics. • Coexisting cubic and rhombohedral phases are induced by an applied electric field. • Quenched samples have more rhombohedral phase and enhanced ferroelectricity. • DC poling results in transformation to a highly textured single rhombohedral phase. • Electrostrain is dominated by the intrinsic lattice strain mechanism. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF