时 间： 2016 年 12 月 14 日 16 : 00 - 18: 00
地 点： 南五楼 612 学术报告厅
报告人： 叶作光 教授，加拿大西蒙-菲舍尔大学
邀请人： 姜胜林 教授
报告摘要：
含铅弛豫铁电体的钙钛矿固溶体材料广泛应用于压电和电致伸缩传感器、驱动器、电容器等，但铅作为 “铁电活性”离子，是一种有毒元素，因此本课题对无铅材料性能的微观机制进行了深入研究。弛豫基固溶体的最佳性能通常在对应于两种现象：准同型晶界和弛豫行为到正常铁电体行为特性的交叉点。目前无铅体系的研究主要集中在准同型晶界固溶体，本课题分析了无铅钙钛矿固溶体从铁电到弛豫状态的浓度诱导的交叉结果，并讨论了其基础微观机制。
Perovskitesolid solutions based on lead-containing relaxorferroelectrics are widely used as materials for numerous applications in piezoelectric and electrostrictivesensors and actuators, capacitors, etc. It is clear, however, that the role of lead, which is known to be a “ferroactive” ion, is important. On the other hand, lead is an ecologically hazardous element, thus intensive research on lead-free analogs has been undertaken in the last several years. In this talk we analyze the results on the concentration-induced crossover from ferroelectric to relaxorstate in lead-free perovskitesolid solutions recently obtained in our laboratory and published in the literature to underline the characteristics specific to each group of materials and to discuss the underlying microscopic mechanisms.
报告人介绍：
法国波尔多大学固体材料学，理学博士；瑞士日内瓦大学博士后；加拿大西蒙-菲舍尔大学化学系终生教授，系主任。西安交通大学国家学者。芬兰Oulu大学“Info-Oulu”讲座教授。电子陶瓷，铁电压电材料领域国际知名学者，长期从事新型多功能多铁性材料的研究。研究成果发表在PNAS, Nature Materials、Angew. Chem. Int. Ed.、J. Am. Chem. Soc.、Phys. Rev. Lett., Phys. Rev. B、Appl. Phys. Lett. 、Chem. Materials, J. Mater. Chem. 等高水平学术期刊上发表SCI论文约270篇（含多篇综述），被引4300多次，H因子为41。
Ye received his Ph.D. degree from l’Universitéde Bordeaux I, France, and did post-doc research at l’Universitéde Genève, Switzerland. He has been a full professor at Simon Fraser University, Burnaby, British Columbia, Canada. He has served a 5-year term as the chair of the Department of Chemistry and is a funding director of the 4D LABS, an interdisciplinary materials research centre. Ye was named “Info-Tech Oulu Lecturer” at the University of Oulu, Finland, and is currently a “Qian-RenScholar” with the International Centre for Dielectric Research at Xi’an JiaotongUniversity, China.Hehas published over 270 peer-reviewed SCI research papers (with over 4300 SCI citations by others and an H-Index of 41) and 10 review articles onthe journal of PNAS, Nature Materials、Angew. Chem. Int. Ed.、J. Am. Chem. Soc.、Phys. Rev. Lett., Phys. Rev. B、Appl. Phys. Lett. 、Chem. Materials, J. Mater. Chem.
