教學周
報告題目：Supramolecular Strategy to Ferroelectrics and Multiferroics
報 告 人：Takayoshi Nakamura 教授 （北海道大學）
報告時間：2024年11月4日上午 10:00-12:00
報告地點：國際有序物質科學研究院2樓會議室（202）
報告人簡介：Takayoshi Nakamura教授，1982至1989年于日本東京大學化學系畢業，獲得學士、碩士以及博士學位。1992至1993年任威爾斯大學理學院訪問科學家，1993至1994年擔任日本國家材料與化學研究所資深研究員，1997年至今擔任北海道大學電子科學研究所教授。主要從事分子組裝系統開發有機導體，磁體和鐵電體的研究工作，包括超分子轉子結構的導體、磁性材料、電介質的開發；開發使用混合價多金屬氧酸鹽的新型電子材料；使用金屬絡合物開發新型多孔材料等。
報告內容：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.
報告題目：Solid-solution Strategy for Functional Molecular Ionic Crystals
報 告 人：Ryo Tsunashima 副教授 （山口大學）
報告人簡介：Ryo Tsunashima于2007年在北海道大學Takayoshi Nakamura教授的指導下完成了博士學位。之后，在格拉斯哥大學Leroy Cronin教授的小組中擔任研究助理。2009年在山口大學任副教授，主要研究方向為多金屬氧酸鹽、配位化合物、有機分子等分子多核金屬配合物的分子基固態化學。近年來，其研究集中在分子離子晶體的固溶體。
報告內容：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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