NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PUBLICATIONS

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
Pub Type
Journals

Keywords

Cproperty5Ge131, structure, thermoelectric, type II clathrates
Energy, Ceramics and Biomaterials

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 October 13, 2025)

Issues

If you have any questions about this publication or are having problems accessing it, please contact [email protected].

Created January 12, 2009, Updated October 12, 2021
Was this page helpful?