钛酸锶钡(Ba0.7Sr0.3TiO3)厚膜陶瓷的大电卡效应和储能密度

Large Electrocaloric Effect and Energy Storage Density in Barium Strontium Titanate(Ba0.7Sr0.3TiO33) Thick Film Ceramic

采用固相反应法制备了钛酸锶钡（Ba0.7Sr0.3TiO33）精细粉体,通过流延法制备出厚度约55μm的厚膜陶瓷。利用X射线衍射和扫描电子显微镜分析了样品的物相组成和微观形貌。利用阻抗分析仪和铁电电滞回线测试仪测量了厚膜陶瓷样品的介电性能和铁电性能。根据Maxwell关系估算了电卡效应,并根据电滞回线计算了储能密度和储能效率。结果表明：钛酸锶钡（Ba0.7Sr0.3TiO33）厚膜在330 K（57℃）Curie温度附近、30 MV/m电场下绝热温变达到3.43 K,同时在30 MV/m电场时储能密度达到1.43 J/cm^3,显示出良好的电卡性能和储能特性。

Barium strontium titanate（Ba0.7Sr0.3TiO3-BST） powder was prepared via a solid-state reaction method. The thick film ceramic with a thickness of approximately 55 μm was procured by a tape-casting approach. The crystalline structures and morphologies of the ceramic samples were analyzed by X-ray diffraction and scanning electron microscopy. The dielectric and ferroelectric properties of the BST ceramics were analyzed by a precision impedance analyzer and a ferroelectric polarization-electric field（P–E） hysteresis loop tester, respectively. The electrocaloric effect was calculated based on the Maxwell relations and the P–Eloops, and the energy storage density and energy storage efficiency were calculated using the discharge part of the P–E loops. An adiabatic temperature is 3.43 K at the Curie temperature of 330 K（57 ℃） and the electric field of 30 MV/m and a discharge energy density is 1.43 J/cm^3 at 30 MV/m for BST thick film ceramic, indicating a promising potential application for ECE and energy storage devices.