论文标题
LA掺杂的放宽剂铁电PNN-PHT中的异常改进的介电作用
Abnormal improved dielectric in La doped relaxor ferroelectric PNN-PHT
论文作者
论文摘要
松弛剂铁电体是复杂的材料，具有与经典铁电的不同特性不同。探测频率依赖介电敏感性是其特征。基于经典铁电的其他经验定律仍然适用于松弛剂铁电。在这里，我们报告了LA掺杂的弛豫剂铁电的介电异常的0.4pnn-0.6pht，这偏离了与压电系数的一致变化关系。提出了一种中尺度机制，以揭示0.4pnn-0.6pht中改善的介电响应的起源，其中极性纳米区域的比对可以促进对外部场的极化响应。这种机制强调了极化波动在0.4pnn-0.6pht的宏观特性上的关键作用。
Relaxor ferroelectrics are complex materials with distinct properties different from classic ferroelectrics. Probing frequency depended dielectric susceptibility is its trait. Other empirical laws build on classic ferroelectrics are still applicable to relaxor ferroelectrics. Here we report an abnormal improved dielectric in La doped relaxor ferroelectric 0.4PNN-0.6PHT, which deviated from the consistent variation relationship with piezoelectric coefficient. A mesoscale mechanism is proposed to reveal the origin of the improved dielectric response in 0.4PNN-0.6PHT, where the polar nanoregions alignment can facilitate polarization response to external field. This mechanism emphasizes the critical role of polarization fluctuation on the macroscopic properties of 0.4PNN-0.6PHT.
