Room-temperature electrocaloric effect in (1−x)Ba0.67Sr0.33TiO3–xBa0.9Ca0.1Ti0.9Zr0.1O3 ceramics under moderate electric field
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The electrocaloric effect (ECE) was investigated in (1−x)Ba0.67Sr0.33TiO3–xBa0.9Ca0.1Ti0.9Zr0.1O3 (BST–xBCTZ, 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.
This work was supported by Fundamental Research Funds for the Central Universities (XDJK2015C066).