Structural properties and thermal conductivity of Na1-xGe3+z

Published

April 2, 2010

Author(s)

Winnie K. Wong-Ng, Stevce Stefanoski, James A. Kaduk, Qingzhen Huang, Clifford R. Bowers, George S. Nolas, Beekman Mathew

Abstract

Structural analyses as well as low temperature thermal conductivity is reported for the new phase in the Na-Ge system, Na1-xGe3+z. Specimens were characterized by thermal analysis, conventional and synchrotron powder X-ray diffraction, neutron powder diffraction, nuclear magnetic resonance (NMR) spectroscopy, and electrical and thermal transport measurements. With structural characteristics qualitatively analogous to some aluminum-silicate zeolites, the crystal structure of this material exhibits an unconventional covalently bonded tunnel-like Ge framework, accommodating Na in channels of two different sizes. Observed to be non-stochiometric, this material concurrently exhibits substantial structural disorder in the large channels and a low lattice thermal conductivity, of interest for the identification of novel low thermal conductivity intermetallics for thermoelectric applications.

Citation

Journal of Physics and Chemistry of Solids

Volume

183

Pub Type

Journals

Keywords

crystal structure, intermetallic compounds, microporous materials, thermal conductivity

Citation

Wong-Ng, W. , Stefanoski, S. , Kaduk, J. , Huang, Q. , Bowers, C. , Nolas, G. and Mathew, B. (2010), Structural properties and thermal conductivity of Na1-xGe3+z, Journal of Physics and Chemistry of Solids (Accessed October 8, 2025)