Thermoelectric Transport in Cu7PSe6 with High Copper Ionic Mobility

详细信息    查看全文

• 作者：Kai S. Weldert ; Wolfgang G. Zeier ; Tristan W. Day ; Martin Panth枚fer ; G. Jeffrey Snyder ; Wolfgang Tremel
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：August 27, 2014
• 年：2014
• 卷：136
• 期：34
• 页码：12035-12040
• 全文大小：327K
• ISSN：1520-5126

文摘

Building on the good thermoelectric performances of binary superionic compounds like Cu₂Se, Ag₂Se and Cu₂S, a better and more detailed understanding of phonon-liquid electron-crystal (PLEC) thermoelectric materials is desirable. In this work we present the thermoelectric transport properties of the compound Cu₇PSe₆ as the first representative of the class of argyrodite-type ion conducting thermoelectrics. With a huge variety of possible compositions and high ionic conductivity even at room temperature, the argyrodites represent a very good model system to study structure鈥損roperty relationships for PLEC thermoelectric materials. We particularly highlight the extraordinary low thermal conductivity of Cu₇PSe₆ below the glass limit, which can be associated with the molten copper sublattice leading to a softening of phonon modes.