Electrical properties, strain stability and electrostrictive behavior in 0.5BaZr0.2Ti0.8O3-(0.5-x)Ba0.7Ca0.3TiO3-xBa0.7Sr0.3TiO3 lead-free ceramics.

To obtain outstanding electrical properties of Barium titanate based ceramics to meet the requirements of the practical applications, a new system of BaZr 0.2 Ti 0.8 O 3 -(0.5- x)Ba 0.7 Ca 0.3 TiO 3 - x Ba 0.7 Sr 0.3 TiO 3 (BZT-BCT- x BST, 0 ≤ x ≤ 0.5) lead-free material was designed. A systematic study about piezoelectric, ferroelectric, and strain properties was carried out in the ceramics. The BZT-BCT- x BST ceramics with x = 0.3 exhibit an enhanced electrical property (e.g. , d 33 ∼540 pC/N, k p ∼0.42, ε r ∼4560, tan δ ∼0.023, and straiñ0.132% @30 kV/cm) as well as a good electrostrictive behavior (Q 33 ∼0.0366 m4 C−2, Straiñ0.08%), and Q 33 value is compared to PZT-baesd materials. In addition, the influence of external fields (temperature, electric field) on strain stability reveals that the strain under high driving electric fields has comparatively good temperature stability. We firmly believe that such a work can be beneficial to the practical process of BT-based ceramics. • An Enhanced comprehensive performance (e.g. , d 33 ∼540 pC/N, d 33 * ∼ 1085 p.m./V@3 kV/cm) was obtained. • A good electrostrictive behavior (Q 33 ∼0.0366 m4 C−2, Straiñ0.08%) is comparable to that of PZT-baesd materials. • The influence of external field (temperature, electric field) on strain stability has discussed. [ABSTRACT FROM AUTHOR]