Journal of Materiomics ( IF 8.4 ) Pub Date : 2021-12-28 , DOI: 10.1016/j.jmat.2021.12.007 Krishnarjun Banerjee 1 , Saket Asthana 1
In this work, the dependency of the polarization (P) - electric field (E) loop area of lead free ferroelectrics Na0.5Bi0.5TiO3 (NBT), K0.5Bi0.5TiO3 (KBT), and Na0.25K0.25Bi0.5TiO3 (NKBT) on the amplitude () of the electric field is studied. Based on the nature of the hysteresis loop with increasing , the versus graph is divided into three stages and the scaling exponents of each stage are estimated. In the third stage, NBT, KBT, and NKBT show different shapes of P-E loops (square, slanted and pinched, respectively). Although, almost similar slopes in the third stage are obtained from the versus graphs of KBT and NKBT, the formation of pinched P-E loop of NKBT is discussed based on the current-time curve under a complete cycle of the applied electric field. The shape of the P-E loop also affects the recoverable energy storage density ) of the material. Similar to the scaling of , the variation of with of NBT, KBT and NKBT are examined. Interestingly, three stages are only noticed in the curve of pinched P-E loop (NKBT), whereas linearly increases with for square and slanted P-E loop. Such type of behavior of of NKBT is explained based on the reversible domain switching mechanism of the pinched P-E loop.
中文翻译:
Na0.5Bi0.5TiO3、K0.5Bi0.5TiO3和Na0.25K0.25Bi0.5TiO3铁电体中不同形状磁滞回线的缩放行为和可恢复的储能密度
在这项工作中,极化 (P) - 电场 (E) 环路面积的依赖性在振幅( _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) 的电场进行了研究。基于磁滞回线的性质,随着增加, 这相对图分为三个阶段,并估计每个阶段的缩放指数。在第三阶段,NBT、KBT 和 NKBT 显示出不同形状的 PE 环(分别为方形、倾斜和捏合)。虽然,第三阶段几乎相似的斜率是从相对在KBT和NKBT的曲线图上,根据施加电场的一个完整周期下的电流-时间曲线,讨论了NKBT的收缩PE环的形成。PE回路的形状也会影响可恢复的储能密度) 的材料。类似于缩放, 的变化和对 NBT、KBT 和 NKBT 进行检查。有趣的是,三个阶段只在 收缩 PE 环 (NKBT) 的曲线,而随着线性增加用于方形和倾斜 PE 环。这种类型的行为NKBT 的解释基于收缩 PE 环路的可逆域切换机制。