In-depth understanding of {110}-type domain walls in bismuth titanate ceramics
In-depth understanding of {110}-type domain walls in bismuth titanate ceramics
复制标题
DOI：
10.1016/j.scriptamat.2022.114793
复制
发表时间：
2022-08
影响因子：
6
通讯作者：
Shaoxiong Xie;Jikai Shi;Qian Xu;Qingyuan Wang;Jianguo Zhu;Y. Sato;Qiang Chen
中科院分区：
文献类型：
--
作者：
Shaoxiong Xie;Jikai Shi;Qian Xu;Qingyuan Wang;Jianguo Zhu;Y. Sato;Qiang Chen
钛酸铋（BIT）陶瓷由于其高居里温度和大的自发极化而被广泛研究用于高温应用。铁电陶瓷的电畴结构对铁电材料的宏观性能起着重要的调节作用，而BIT陶瓷的电畴结构至今还知之甚少，这对BIT基新材料的开发是非常不利的。在这项研究中，有趣的畴壁（DWs）在BIT陶瓷进行了详细的研究。原子尺度观察表明，BIT陶瓷中主要存在能量有利的{110}型90° DW。结合理论分析，这些DW不仅阐述了多种压电响应模式下，但也进一步证实了空间极化分布的孪晶相关的铁电变体的定量重建。这一工作有助于深入了解BIT陶瓷的电畴结构和压电响应机理，有助于推动BIT陶瓷在先进电子器件中的应用。
Bismuth titanate(BIT) ceramics have been widely studied for high temperature applications thanks to their high Curie temperature and large spontaneous polarization. The underlying domain structures play significant roles in regulating the macroscopic properties of ferroelectric materials, while there is only limited knowledge of the domain structures for BIT ceramics until now, substantially bad for the development of BIT-based new materials. In this study, the intriguing domain walls(DWs) in BIT ceramics were investigated in detail. The atomic-scale observation reveals that there primarily exist energetically favorable {110}-type 90° DWs in BIT ceramics. Combined with the theoretical analysis, these DWs are not only elaborated under multiple piezoelectric response modes, but also further corroborated by the quantitative reconstruction of spatial polarization distributions of twin-related ferroelectric variants. This work sheds insight into domain structure and piezoelectric response mechanism in BIT ceramics, and contributes to promoting their more applications in advanced electron devices.