Room-temperature electrocaloric effect in (1−x)Ba0.67Sr0.33TiO3–xBa0.9Ca0.1Ti0.9Zr0.1O3 ceramics under moderate electric field

• Published in: Journal of materials science. Materials in electronics 2018-05, Vol.29 (9), p.7227-7232
• Main Authors: Xu, Zunping, Qiang, Hua, Chen, Yi, Liu, Gang
• Format: Article
• Language: English
• Subjects: Ceramic powders; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Electric fields; Materials Science; Optical and Electronic Materials; Phase transitions; Room temperature; Temperature; Transition temperature
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-018-8711-2

The electrocaloric effect (ECE) was investigated in (1− x )Ba 0.67 Sr 0.33 TiO 3 – x Ba 0.9 Ca 0.1 Ti 0.9 Zr 0.1 O 3 (BST– x BCTZ, x  = 0, 0.05, 0.1 and 0.2) ceramics synthesized using citrate–nitrate combustion derived powders. The dielectric spectroscopy revealed that the phase transition temperature increases with increasing x . The ECE was calculated using the Maxwell relation based on the P – E hystersis loops. The addition of BCTZ has notable effect on the microstructure and ECE of ceramic samples. The most promising electrocaloric temperature change (△ T ) of 0.74 K and electrocaloric responsivity (△ T /△ E ) of 0.247 × 10 −6  K m V −1 were obtained in BST–0.05BCTZ ceramic under a moderate electric field of 30 kV/cm near cubic-to-tetragonal phase transition temperature.