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Synthesis and Transport Properties of Framework-Substituted Cs8Na16Cu5Ge131

Published

Author(s)

Matthew Beekman, James A. Kaduk, J Gryko, Winnie Wong-Ng, Alexander J. Shapiro, George S. Nolas

Abstract

We report the synthesis and temperature dependent transport properties of a new type II germanium clathrate, Cs8Na16Cu5Ge131 (space group Fd3m; a = 15.42000(9) ) . In comparison to the parent compound Cs8Na16Ge136, Cu substitution for Ge on the clathrate framework was found to increase both the electrical resistivity and Seebeck coefficient, while reducing the thermal conductivity. The results are consistent with partial charge compensation due to Cu substitution for Ge. In addition to presenting possibilities for new compositions, framework substitution in type II clathrates may offer a route to control of the transport properties of these materials, offering potential candidates for thermoelectric applications.
Citation
Journal of Alloys and Compounds
Volume
470

Keywords

Cproperty5Ge131, structure, thermoelectric, type II clathrates

Citation

Beekman, M. , Kaduk, J. , Gryko, J. , Wong-Ng, W. , Shapiro, A. and Nolas, G. (2009), Synthesis and Transport Properties of Framework-Substituted Cs<sub>8</sub>Na<sub>16</sub>Cu<sub>5</sub>Ge<sub>131</sub>, Journal of Alloys and Compounds (Accessed March 5, 2024)
Created January 12, 2009, Updated October 12, 2021