|
|||||
|
|
Structure and thermal conductivity of Na1−xGe3+z |
|
| Authors: | M Beekman W Wong-Ng Q Huang CR Bowers |
| Institution: | a Department of Physics, University of South Florida, Tampa, FL 33620, USA b Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA c Poly Crystallography, Inc., Naperville, IL 60540, USA d NIST Center for Neutron Research, Gaithersburg, MD 20899, USA e Department of Chemistry, University of Florida, Gainesville, FL 32611, USA |
| Abstract: | Structural analyses as well as low temperature thermal conductivity is reported for the binary phase Na1−xGe3+z. Specimens were characterized by thermal analysis, conventional and synchrotron powder X-ray diffraction, neutron powder diffraction, 23Na 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, Na1−xGe3+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. |
| Keywords: | Crystal structure Intermetallic compounds Thermoelectrics Thermal conductivity |
| 本文献已被 ScienceDirect 等数据库收录！ | |