Work

Synthesis, Crystal Structure, and Transport Properties of Na22Si136

Year: 2009

Type: article

Abstract: The type II clathrate Na22Si136 is prepared by the thermal decomposition of NaSi. Thermal analysis indicates this phase is metastable yet has a relatively high decomposition temperature. Rietveld analysis indicates that Na in the larger Si28 cage is shifted off-center, analogous to observations in some type I clathrates. Temperature-dependent electrical and thermal transport properties are reported for Na22Si136, for which the spark plasma sintering technique was found to be effective in achieving intergrain sintering in the consolidated specimen. The potential that type II clathrate materials possess for thermoelectric applications is discussed.

Source: Journal of Electronic Materials

DOI: 10.1007/s11664-008-0641-y

Authors: M. Beekman, C. P. Sebastian, Yu. Grin, G. S. Nolas

Institutions: University of South Florida, Max Planck Society, Max Planck Institute for Chemical Physics of Solids

Language: English

Topic: Advanced Thermoelectric Materials and Devices

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,390

Funders: U.S. Department of Energy, University of South Florida