| Title |
Electromechanical properties in CaTiO3 modified Na0.5Bi0.5TiO3-BaTiO3 solid solutions above morphotropic phase boundary |
| Authors |
Jurjans, M ; Bikse, L ; Birks, E ; Svirskas, Šarūnas ; Antonova, M ; Kundzins, M ; Sternberg, A |
| DOI |
10.1063/5.0072329 |
| Full Text |
|
| Is Part of |
AIP advances.. Melville : AIP publishing. 2022, vol. 12, iss. 3, art. no. 035124, p. [1-9].. eISSN 2158-3226 |
| Keywords [eng] |
phase transitions ; piezoelectricity ; ferroelectric materials ; X-ray diffraction ; ceramics |
| Abstract [eng] |
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. |
| Published |
Melville : AIP publishing |
| Type |
Journal article |
| Language |
English |
| Publication date |
2022 |
| CC license |
|
