In-situ manipulation of ferroelectic structures at atomic level

原子级铁电结构的原位操纵

• 批准号: 2271165
• 金额: --
• 依托单位: University of Warwick
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2271165
• 关键词: situ; manipulation; ferroelectic; structures; atomic

Ferroelectric materials are characterized by the existence of a finite electric polarization in absence of an external field below the Curie temperature. These materials tend to form domains, i.e. areas with the same direction of polarization. The application of an electric field can change the spontaneous polarization of these materials. Therefore, control over the switching of the domains, i.e. the polarization direction is essential for future applications in electro-mechanical devices. Recently, micro-electro-mechanical systems have been developed for transmission electron microscopy, allowing ferroelectric materials to be electrically biased and/or heated in-situ, producing real-time information on the specimen under controllable electrical /temperature conditions. Additionally, it is possible to directly correlate atomic level dynamics to electrical properties and temperature. The main objective of the project is the in-situ manipulation of ferroelectric structures at atomic level. This will require a combination of Scanning Transmission Electron Microscopy and mapping algorithms to carry out polarization analysis of the material with and without biasing at different temperatures.

铁电材料的特征在于在居里温度以下不存在外部场的情况下存在有限的电极化。这些材料倾向于形成域，即具有相同偏振方向的区域。施加电场可以改变这些材料的自发极化。因此，控制域的切换，即极化方向对于机电设备中的未来应用是必不可少的。最近，微机电系统已被开发用于透射电子显微镜，允许铁电材料被电偏置和/或加热原位，在可控的电/温度条件下产生实时信息的标本。此外，还可以将原子级动力学与电学性质和温度直接关联起来。该项目的主要目标是在原子水平上原位操纵铁电结构。这将需要扫描透射电子显微镜和映射算法的组合，以在不同温度下进行材料的偏振分析，并在不同温度下进行偏置。