Lead-free ba0.85ca0.15zr0.1ti0.9o3 (bczt) ceramic powders were synthesized using the sol-gel method. to achieve high-energy storage and large electrocaloric effect in bulk ceramics the ceramics thickness was reduced. dielectric, ferroelectric, energy storage, and electrocaloric properties were investigated for bczt ceramic with 400 {\mu}m. here, pure crystalline structure and homogenous microstructure were identified by xrd analysis and sem measurements, respectively. the dielectric measurements revealed a maximum dielectric constant associated with ferroelectric-paraelectric phase transition. the maximum of {\epsilon} was 7841 around 352 k. furthermore, the bczt ceramic showed improved energy storage and electrocaloric properties. a high recoverable energy density wrec of 0.24 j/cm3 and a total energy density wtotal of 0.27 j/cm3 with an efficiency coefficient of ~ 88% at 423 k under an electric field of 55 kv/cm was obtained. besides, the maximum value of {\delta}t = 2.32 k, the electrocaloric responsivity {\zeta} = 0.42 k mm/kv, the refrigeration capacity rc= 4.59 j/kg and the coefficient of performance cop = 12.38 were achieved around 384 k under 55 kv/cm. the total energy density wtotal and the temperature change {\delta}t were also calculated by exploiting the landau-ginzburg-devonshire (lgd) theory. the theoretical results matched the experimental findings. these results suggest that the synthesized bczt ceramic with the reduced thickness could be a promising candidate for energy storage and electrocaloric applications.

中文翻译：

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改善无铅Ba0.85Ca0.15Zr0.1Ti0.9O3陶瓷的储能和电热性能

采用溶胶-凝胶法合成了无铅ba0.85ca0.15zr0.1ti0.9o3(bczt)陶瓷粉末。为了在块状陶瓷中实现高能量存储和大电热效应，减小了陶瓷厚度。研究了 400 {\mu}m 的 bczt 陶瓷的介电、铁电、储能和电热性能。在这里，纯晶体结构和均匀的微观结构分别通过 xrd 分析和 sem 测量来确定。介电测量揭示了与铁电-顺电相变相关的最大介电常数。{\epsilon} 的最大值为 7841，约为 352 k。此外，bczt 陶瓷显示出改进的能量存储和电热性能。高可恢复能量密度 wrec 为 0.24 j/cm3，总能量密度 wtotal 为 0。在 55 kv/cm 的电场下，在 423 k 时获得了 27 j/cm3 的效率系数约为 88%。此外，最大值 {\delta}t = 2.32 k，电热响应率 {\zeta} = 0.42 k mm/kv，制冷量 rc= 4.59 j/kg 和性能系数 cop = 12.38 达到 384 左右k 低于 55 kv/cm。总能量密度 wtotal 和温度变化 {\delta}t 也是通过利用landau-ginzburg-devonshire (lgd) 理论计算的。理论结果与实验结果相符。这些结果表明，具有减小厚度的合成 bczt 陶瓷可能是储能和电热应用的有希望的候选者。电热响应率 {\zeta} = 0.42 k mm/kv，制冷量 rc= 4.59 j/kg 和性能系数 cop = 12.38 在 55 kv/cm 下达到约 384 k。总能量密度 wtotal 和温度变化 {\delta}t 也是通过利用landau-ginzburg-devonshire (lgd) 理论计算的。理论结果与实验结果相符。这些结果表明，具有减小厚度的合成 bczt 陶瓷可能是储能和电热应用的有希望的候选者。电热响应率 {\zeta} = 0.42 k mm/kv，制冷量 rc= 4.59 j/kg 和性能系数 cop = 12.38 在 55 kv/cm 下达到约 384 k。总能量密度 wtotal 和温度变化 {\delta}t 也是通过利用landau-ginzburg-devonshire (lgd) 理论计算的。理论结果与实验结果相符。这些结果表明，具有减小厚度的合成 bczt 陶瓷可能是储能和电热应用的有希望的候选者。总能量密度 wtotal 和温度变化 {\delta}t 也是通过利用landau-ginzburg-devonshire (lgd) 理论计算的。理论结果与实验结果相符。这些结果表明，具有减小厚度的合成 bczt 陶瓷可能是储能和电热应用的有希望的候选者。总能量密度 wtotal 和温度变化 {\delta}t 也是通过利用landau-ginzburg-devonshire (lgd) 理论计算的。理论结果与实验结果相符。这些结果表明，具有减小厚度的合成 bczt 陶瓷可能是储能和电热应用的有希望的候选者。