Electromechanical properties in CaTiO3 modified Na0.5Bi0.5TiO3-BaTiO3 solid solutions above morphotropic phase boundary

被引：1

作者：

Jurjans, M. ^{[1
]}

Bikse, L. ^{[1
]}

Birks, E. ^{[1
]}

Svirskas, S. ^{[2
]}

Antonova, M. ^{[1
]}

Kundzins, M. ^{[1
]}

Sternberg, A. ^{[1
]}

机构：

[1] Univ Latvia, Inst Solid State Phys, LV-1063 Riga, Latvia

[2] Vilnius Univ, Fac Phys, LT-10222 Vilnius, Lithuania

来源：

AIP ADVANCES | 2022年 / 12卷 / 03期

关键词：

ELECTRICAL-PROPERTIES; LARGE-STRAIN; TEMPERATURE; ELECTROSTRAINS;

D O I：

10.1063/5.0072329

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The structural, electromechanical, and dielectric properties of (1 - x)(0.8Na(0.5)Bi(0.5)TiO(3)-0.2BaTiO(3))-xCaTiO(3) [(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. (C) 2022 Author(s).

引用

页数：8