Topic：Giant Negative Thermal Expansion Materials: Paradigm Shift of Thermal Expansion Control
Speaker：Professor Koshi Takenaka
Venue：Room 513, main building
Bio of the Speaker：
Koshi Takenaka received the bachelor's degree from Kyoto University, Kyoto, Japan, in 1991, and received the Ph. D. degree from the University of Tokyo, Tokyo, Japan, in 1996. He was a Research Associate with Nagoya University, Nagoya, Japan, from 1996 to 2003. He joined the Institute of Physical and Chemical Research (RIKEN), Wako, Japan, in 2003. He became an Associate Professor with Nagoya University in 2007, where he has been a Full Professor since 2013. He discovered giant negative thermal expansion of antiperovskite manganese nitrides in 2005, giant barocaloric effects of antiperovskite manganese nitride in 2015, and colossal negative thermal expansion of layered ruthenium oxides in 2017.
Rapid advances in modern technology require industrial materials that can adapt to severe conditions. One means of adaptation is controlled thermal expansion. Negative thermal expansion (NTE) materials, materials that contract during heating, have been attracting great attention because NTE materials can be used to tune the overall thermal expansion of materials. Remarkable development in the field of NTE materials in this decade has brought a paradigm shift in control of thermal expansion. Here, recent activities in this field are briefly reviewed, particularly addressing giant NTE of the antiperovskite manganese nitrides and the layered ruthenium oxides as well as composite manufacturing using these materials.
School of Physics and Nuclear Engineering