Phase-Change Materials: Vibrational Softening upon Crystallization and Its Impact on Thermal Properties (pages 2232–2239)
Toshiyuki Matsunaga, Noboru Yamada, Rie Kojima, Shinichi Shamoto, Masugu Sato, Hajime Tanida, Tomoya Uruga, Shinji Kohara, Masaki Takata, Peter Zalden, Gunnar Bruns, Ilya Sergueev, Hans Christian Wille, Raphaël Pierre Hermann and Matthias Wuttig
Article first published online: 26 APR 2011 | DOI: 10.1002/adfm.201002274
Crystallization of amorphous solids is usually accompanied by significant changes of transport properties, such as an increase in thermal conductivity. Phase-change materials, however, reveal a remarkably low thermal conductivity in the crystalline state. This phenomenon is caused by the change of bonding upon crystallization which leads to an increase of the sound velocity and a softening of the optical modes.