Probing ferroelectricity with synchrotron light

摘要：

Deliberate manipulation of a ferroelectric response requires a detailed description of various processes occurring in a crystal and evaluation of their contributions to piezoelectric constants and field-induced strains. Single crystals of many ferroelectric perovskites frequently show an enhanced electromechanical response as compared with ceramics materials of the same composition. The enhancement is linked to a structural inhomogeneity at different length scales and to a domain structure forming over an inhomogeneous state. Here I show how in-situ diffraction experiments with synchrotron light contribute in the coherent picture of the structural evolution at different length and time scales. I will focus on lead-based perovskite-like materials and discuss relaxor, antiferroelectric and ferroelectric behavior based on the characteristic diffraction signatures as a function of electric field and temperature.

时间：6月15日上午10点

地点：曲江校区西六楼409会议室

报告人：Dmitry Chernyshov 博士

Dmitry Chernyshov博士，现任欧洲同步辐射光源（European Synchrotron Radiation Facility）Swiss-Norwegian Beam Line 负责人。Chernyshov博士于1998年毕业于俄罗斯彼得堡核物理学院（Petersburg Physics Institute），获得数学与物理博士学位。之后分别于彼得堡核物理学院以及瑞士伯尔尼大学任博士后研究员。2005年任欧洲同步辐射光源（ESRF）瑞士-挪威线站驻站科学家，并于2017年出任线站负责人。Chernyshov博士长期致力于同步辐射及原位衍射技术在晶体学、固体物理学以及结构化学方面的应用，至今已发表160余篇同行评议学术论文，并长期担任Physical Review Letters, Physical Review B等期刊的审稿人。