Atomic Polarization and Surface Properties of Ferroelectric Oxides Leading to Multi Functionality

本研究结合了两种方法来研究铁电晶体的局部结构和极化之间的关系。利用扫描隧道显微镜研究了电场和温度对（100）表面原子结构的影响。利用各种静电力显微镜，包括扫描电位显微镜和压电响应成像，原子极化和电荷补偿的贡献将被量化。单晶钛酸钡将作为模型系统，其中载流子浓度和表面电荷（通过吸附）将发生变化。应用电场对表面吸附的影响将被量化。在高密度信息存储的背景下，铁电陶瓷备受关注。这个项目将通过研究这些复杂材料在纳米尺度上的性质来增强我们对它们的理解。

0080863BonnellThis study combines two approaches to examine the relationship between local structure and polarization in ferroelectric crystals. Using scanning tunneling microscopy the effect of electric fields and temperature on atomic structure of the (100) surface will be determined. Using variants of electrostatic force microscopy including scanning potential microscopy and piezo response imaging, the contributions of atomic polarization and charge compensation will be quantified. Single crystal barium titanate will serve as the model system in which carrier concentration, and surface charge (via adsorption) will be varied. The effects of applied fields on surface adsorption will be quantified.Ferroelectric ceramics are receiving much attention in the context of high density information storage. This project will enhance our understanding of these complex materials by studying their properties at the nanometer scale.