新型钛酸锶基弛豫铁电陶瓷的结构与储能性能研究

This study develops lead-free relaxor ferroelectric ceramic Sr0.475Cd0.3Bi0.15TiO3 (SCBT) via solid-state reaction. A-site co-doping enhances breakdown strength and polarization, yielding 1.12 J·cm⁻³ energy density and 92.09% efficiency at 220 kV·cm⁻¹, with excellent thermal, frequency, and cycling stability.

脉冲功率技术的发展对储能电介质材料提出了更高要求,亟需开发兼具高储能密度和高效率的介质材料.本研究采用传统固相法制备了新型无铅弛豫铁电陶瓷Sr0.475Cd0.3Bi0.15TiO3(SCBT).该材料A位由Sr2+、Cd2+和Bi3+共同占据,其中Sr2+和Cd2+提升了材料的绝缘性能和击穿场强,Bi3+的孤对电子效应增强了极化强度,而多元离子的无序分布诱导出显著弛豫特性.实验结果表明,SCBT在220 kV·cm-1电场下实现了 1.12 J·cn-3的储能密度和92.09％的储能效率,并在21～150 ℃温度范围、10～1000 Hz频率区间及105次充放电循环中表现出优异的稳定性.该材料在脉冲功率电容器领域展现出巨大应用潜力.