Development of ferroelectric crystals by dynamically controlling the molecular environment in charge transfer complex crystals

2015 Fiscal Year Final Research Report

• Project/Area Number: 26620054
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Functional solid state chemistry
• Research Institution: Hokkaido University
• Principal Investigator: Harada Jun 北海道大学, 理学(系)研究科(研究院), 准教授 (00313172)
• Co-Investigator(Renkei-kenkyūsha): INABE Tamotsu 北海道大学, 大学院理学研究院, 教授 (20168412) ; TAKAHASHI Yukihiro 北海道大学, 大学院理学研究院, 助教 (40443197)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 結晶 / 誘電物性

Outline of Final Research Achievements

In this study we have investigated crystal structures and dielectric properties of several weakly bound charge transfer complexes and revealed that the polar　acceptor molecules, which were not mobile in their single component crystals, acquired the freedom of reorientation in the CT crystals and underwent in-plane reorientation, which gave rise to dielectric responses. Order-disorder phase transitions were observed for some of the CT crystals, which resulted in abrupt changes in the dielectric constant at the transition temperatures.

Free Research Field

有機物理化学