Thermoelectric Transport in Cu_7PSe_6 with High Copper Ionic Mobility
Abstract
Building on the good thermoelectric performances of binary superionic compounds like Cu_2Se, Ag_2Se and Cu_2S, 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 Cu_7PSe_6 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–property relationships for PLEC thermoelectric materials. We particularly highlight the extraordinary low thermal conductivity of Cu_7PSe_6 below the glass limit, which can be associated with the molten copper sublattice leading to a softening of phonon modes.
Additional Information
© 2014 American Chemical Society. Received: June 4, 2014. Publication Date (Web): July 24, 2014. Financial support through the Excellence Initiative (DFG/GSC 266) is acknowledged by K.W. We acknowledge support from the DFG priority program SPP1386 "Nanostructured Thermoelectrics". T. W. Day and G. J. Snyder acknowledge support from the U.S. Air Force Office of Scientific Research. We gratefully thank David Brown (CalTech) for fruitful discussions.Additional details
- Alternative title
- Thermoelectric Transport in Cu7PSe6 with High Copper Ionic Mobility
- Eprint ID
- 50079
- Resolver ID
- CaltechAUTHORS:20140929-073134297
- DFG/GSC 266
- Excellence Initiative
- SPP1386
- DFG priority program
- Air Force Office of Scientific Research (AFOSR)
- Created
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2014-09-29Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field