报告题目:Supramolecular Strategy to Ferroelectrics and Multiferroics
报 告 人:Takayoshi Nakamura 教授 (北海道大学)
报告时间:2024年11月4日上午 10:00-12:00
报告地点:国际有序物质科学研究院2楼会议室(202)
报告人简介:Takayoshi Nakamura教授,1982至1989年于日本东京大学化学系毕业,获得学士、硕士以及博士学位。1992至1993年任威尔斯大学理学院访问科学家,1993至1994年担任日本国家材料与化学研究所资深研究员,1997年至今担任北海道大学电子科学研究所教授。主要从事分子组装系统开发有机导体,磁体和铁电体的研究工作,包括超分子转子结构的导体、磁性材料、电介质的开发;开发使用混合价多金属氧酸盐的新型电子材料;使用金属络合物开发新型多孔材料等。
报告内容:Molecular machines have undergone comprehensive investigation, leading to the reporting of various artificial molecular machines encompassing molecular motors, propellers, switches, and shuttles. Our focus lies in the development of supramolecular systems demonstrating molecular motion within crystals. Within a crystal lattice, molecules assume fixed positions, forming a directional and high-density array. The coordinated motion of individual molecules, facilitated by intermolecular interactions, induces diverse functionalities in crystals, such as polarity conversion and mass transport, resulting from the periodic nature of these crystals. In addition to a comprehensive introduction to dielectrics and molecular ferroelectrics, this talk will discuss recent progress in low-dimensional ferroelectrics and type I multiferroics based on supramolecular approaches.
报告题目:Solid-solution Strategy for Functional Molecular Ionic Crystals
报 告 人:Ryo Tsunashima 副教授 (山口大学)
报告时间:2024年11月4日上午 10:00-12:00
报告地点:国际有序物质科学研究院2楼会议室(202)
报告人简介:Ryo Tsunashima于2007年在北海道大学Takayoshi Nakamura教授的指导下完成了博士学位。之后,在格拉斯哥大学Leroy Cronin教授的小组中担任研究助理。2009年在山口大学任副教授,主要研究方向为多金属氧酸盐、配位化合物、有机分子等分子多核金属配合物的分子基固态化学。近年来,其研究集中在分子离子晶体的固溶体。
报告内容:Solid-solution is common materials strategy to tuning properties and functionality of the inorganic solids, where differences in radius of ions are below 15% known as Hume-Rothery rules. Structural similarity is key requirement for high solubility in the lattice. Thus, molecular crystals are not the better solid-state materials to be dissolved at the molecular level. The easier the molecule is to be dissolved in the lattice, the less dramatic the change in the physical properties and characteristics of the resulting solid solution. We have been developed solid-solution of the heteromorphic molecules which are usually not form solid solution. Solid-solution methodology for metal-free perovskite compounds will be discussed with our recent papers.
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