Structure and thermal conductivity of Na sub(1-) sub(x)Ge sub(3+) sub(z)

Structural analyses as well as low temperature thermal conductivity is reported for the binary phase Na sub(1-) sub(x)Ge sub(3+) sub(z). Specimens were characterized by thermal analysis, conventional and synchrotron powder X-ray diffraction, neutron powder diffraction, super(23)Na nuclear magnetic r...

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Bibliographic Details
Published in:Journal of solid state chemistry 2010-06, Vol.183 (6), p.1272-1277
Main Authors: Beekman, M, Stefanoski, S, Wong-Ng, W, Kaduk, JA, Huang, Q, Reeg, C, Bowers, C R, Nolas, G S
Format: Article
Language:English
Subjects:
Aluminum
Channels
Diffraction
Disorders
Heat transfer
Thermal analysis
Thermal conductivity
Thermoelectricity
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Summary:Structural analyses as well as low temperature thermal conductivity is reported for the binary phase Na sub(1-) sub(x)Ge sub(3+) sub(z). Specimens were characterized by thermal analysis, conventional and synchrotron powder X-ray diffraction, neutron powder diffraction, super(23)Na nuclear magnetic resonance spectroscopy, and electrical and thermal transport measurements. With structural characteristics qualitatively analogous to some aluminum-silicate zeolites, the crystal structure of this phase exhibits an unconventional covalently bonded tunnel-like Ge framework, accommodating Na in channels of two different sizes. Observed to be non-stochiometric, Na sub(1-) sub(x)Ge sub(3+) sub(z) concurrently exhibits substantial structural disorder in the large channels and a low lattice thermal conductivity, of interest in the context of identifying novel low thermal conductivity intermetallics for thermoelectric applications.
ISSN:0022-4596
DOI:10.1016/j.jssc.2010.03.035