Remarkably enhanced dielectric stability and energy storage properties in BNT-BST relaxor ceramics by A-site defect engineering for pulsed power applications
Remarkably enhanced dielectric stability and energy storage properties in BNT-BST relaxor ceramics by A-site defect engineering for pulsed power applications
复制标题
通过脉冲功率应用的 A 位缺陷工程，显着增强 BNT-BST 弛豫陶瓷的介电稳定性和储能特性
DOI：
10.1007/s40145-021-0532-8
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发表时间：
2022-02-01
影响因子：
16.9
通讯作者：
Li, Yueming
中科院分区：
文献类型：
--
作者：
Li, Zhipeng;Li, Dong-Xu;Li, Yueming
先进脉冲电容器用无铅块体陶瓷的可恢复储能密度（W-rec）相对较低，特别是在低电场条件下。为了解决这个问题，我们提出了一种A位缺陷工程，通过破坏A位离子的有序排列来优化电极化行为，其中Ba 0.105Na 0.325Sr 0.245 -1.5x矩形0.5xBi 0.325 + xTiO 3选择（BNS 0.245 -1.5x矩形0.5xB 0.325 +xT，x = 0、0.02、0.04、0.06和0.08）无铅陶瓷作为代表。采用无压固态烧结法制备了BNS0.245-1.5x矩形0.5xB0.325+xT陶瓷，当x = 0.06时，在低电场（@110 kV/cm）下获得了大的W-rec（1.8 J/cm（3））。在相对低的电场（< 160 kV/cm）下，与无铅块体陶瓷中的所有其他W-rec相比，1.8 J/cm（3）的值是超高的。在40-350 V的宽温区，BNS 0.245 -1.5x矩形0.5xB 0.325 +xT（x = 0.06）陶瓷的介电常数在15%的波动范围内达到2930。这种优异的性能可以归因于A位缺陷工程，它可以降低剩余极化（P-r）并改善极性纳米区（PNR）的热演化。本工作证实了BNS_（0.245 - 1.5）x矩形0.5xB_（0.325 +xT）（x = 0.06）陶瓷是先进脉冲功率电容器的理想材料，并将推动一系列具有高W-rec和高温稳定性的Bi_（0.5）Na_（0.5）TiO_3（BNT）基陶瓷的发展。
Lead-free bulk ceramics for advanced pulsed power capacitors show relatively low recoverable energy storage density (W-rec) especially at low electric field condition. To address this challenge, we propose an A-site defect engineering to optimize the electric polarization behavior by disrupting the orderly arrangement of A-site ions, in which Ba0.105Na0.325Sr0.245-1.5x rectangle 0.5xBi0.325+xTiO3 (BNS0.245-1.5x rectangle 0.5xB0.325+xT, x = 0, 0.02, 0.04, 0.06, and 0.08) lead-free ceramics are selected as the representative. The BNS0.245-1.5x rectangle 0.5xB0.325+xT ceramics are prepared by using pressureless solid-state sintering and achieve large W-rec (1.8 J/cm(3)) at a low electric field (@110 kV/cm) when x = 0.06. The value of 1.8 J/cm(3) is super high as compared to all other W-rec in lead-free bulk ceramics under a relatively low electric field (< 160 kV/cm). Furthermore, a high dielectric constant of 2930 within 15% fluctuation in a wide temperature range of 40-350 V is also obtained in BNS0.245-1.5x rectangle 0.5xB0.325+xT (x = 0.06) ceramics. The excellent performances can be attributed to the A-site defect engineering, which can reduce remnant polarization (P-r) and improve the thermal evolution of polar nanoregions (PNRs). This work confirms that the BNS0.245-1.5x rectangle 0.5xB0.325+xT (x = 0.06) ceramics are desirable for advanced pulsed power capacitors, and will push the development of a series of Bi0.5Na0.5TiO3 (BNT)-based ceramics with high W-rec and high-temperature stability.