Electromechanical properties in CaTiO3modified Na0.5Bi0.5TiO3-BaTiO3solid solutions above morphotropic phase boundary
Öffnen
Autor
Jurjans, M.
Bikše, Līga
Birks, Eriks
Svirskas, Š.
Antonova, M.
Kundzins, Maris
Sternberg, Andris
Datum
2022Metadata
Zur LanganzeigeZusammenfassung
The structural, electromechanical, and dielectric properties of (1-x)(0.8Na0.5Bi0.5TiO3-0.2BaTiO3)-xCaTiO3 [(1-x) (0.8NBT-0.2BT)-xCT] ceramics are studied as candidates for room temperature actuators with high field-induced strain. The choice of 0.8NBT-0.2BT as a starting composition is motivated by the large tetragonality in this concentration range, even though it is located far away from the morphotropic phase boundary. CaTiO3 was chosen as a third component to decrease the depolarization temperature and achieve a high field-induced strain at room temperature. The measured strains at the field-induced phase transition are remarkably lower than might be expected from the jump in unit cell parameters at the phase transition. This inconsistency could be related to an incomplete field-induced phase transition from the ferroelectric phase to the nonpolar phase. Among all of the manufactured samples, the phase transition is close to room temperature in the composition with x = 0.100, which allows obtaining unipolar strains up to 0.23% at E = 65 kV/cm. Electrostrictive-like strain was observed not only above the depolarization temperature but also in the region of field-induced phase transition. © 2022 Author(s). --//-- Article Jurjans M., Bikse L., Birks E., Svirskas Š., Antonova M., Kundzins M., Sternberg A., "Electromechanical properties in CaTiO3modified Na0.5Bi0.5TiO3-BaTiO3solid solutions above morphotropic phase boundary" (2022) AIP Advances, 12 (3), art. no. 035124, DOI: 10.1063/5.0072329 published under CC BY 3.0 licence.