Abstract The present study investigates energy storage and electrocaloric properties of lead-free barium calcium titanate (BCT) ceramics with compositions B0.80Ca0.20Ti1–3x/4FexO3 (x = 0.000, 0.005, 0.010, 0.015, and 0.020) prepared by solid-state reaction route. Variation of polarization with the temperature at various applied fields has been used to study the electrocaloric behavior of the prepared ceramic samples. An indirect method based on the thermodynamic Maxwell’s relation is employed to evaluate adiabatic temperature change (ΔT), isothermal entropy change (ΔS), and electrocaloric responsivity (ΔT/ΔE). Energy storage density (Wrec), energy loss density (Wloss), and efficiency (η) of Fe-doped BCT ceramics have been obtained from the integral area of ferroelectric hysteresis loops. With an increase in Fe content, room temperature energy storage density is observed to increase from 87.26 mJ/cm3 to 140.18 mJ/cm3. A relatively high energy storage efficiency of η = 51% has been achieved at electric field ̴ 10 kV/cm for x = 0.020. Also, an appreciable increase in energy storage density with field and temperature has been observed. These studies suggest application of prepared ceramic compositions for new generation cooling or heating devices and dielectric materials with high energy storage density.

中文翻译：

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无铅Fe掺杂BCT陶瓷的储能及电热行为研究

摘要 本研究调查了无铅钛酸钙钡 (BCT) 陶瓷的储能和电热性能，其成分为 B0.80Ca0.20Ti1–3x/4FexO3（x = 0.000、0.005、0.010、0.015 和 0.020），由固体制备。状态反应路线。极化随温度在不同外加场的变化已被用于研究制备的陶瓷样品的电热行为。采用基于热力学麦克斯韦关系的间接方法来评估绝热温度变化 (ΔT)、等温熵变 (ΔS) 和电热响应率 (ΔT/ΔE)。Fe掺杂BCT陶瓷的储能密度（Wrec）、能量损失密度（Wloss）和效率（η）由铁电磁滞回线的积分面积获得。随着 Fe 含量的增加，观察到室温储能密度从 87.26 mJ/cm3 增加到 140.18 mJ/cm3。对于 x = 0.020，在电场 ̴ 10 kV/cm 下实现了相对较高的能量存储效率 η = 51%。此外，已经观察到能量存储密度随场和温度的显着增加。这些研究表明制备的陶瓷组合物可用于新一代冷却或加热装置和具有高能量存储密度的介电材料。