题 目：Phonon-Glass Electron-Crystal Thermoelectric Clathrates: Theory
报告人：Prof. Tsuneyoshi Nakayama(Hokkaido University, Saporo, Japan)
The “phonon-glass electron-crystal” concept is one of the guiding principles to explore efficient thermoelectric materials. Type-I clathrate compounds satisfy this concept, in which the group 1 or 2 elements in the periodic table are encaged as the so-called “rattling” guest atom. It is remarkable that, though these cage-forming compounds have crystalline cubic-structure, they exhibit glass-like phonon thermal conductivity over the whole temperature range. An efficient thermoelectric effect is realized in clathrates showing these glass-like characteristics. The point is why these compounds without topological disorder show almost identical dynamic and thermal properties to those of structural glasses. I will present theoretical interpretation on the emergence of glass-like behaviors, based on our recent article1).
1) Phonon-Glass Electron-Crystal Thermoelectric Clathrates: Experiments and Theory, to be published in “Reviews of Modern Physics”