Pressure-induced phase transition and electrical properties of thermoelectric Al-doped Mg2Si
Abstract
A recent study has shown the thermoelectric performance of Al-doped Mg2Si materials can be significantly enhanced at moderate pressure. To understand the cause of this phenomenon, we have performed in situ angle dispersive X-ray diffraction and infrared reflectivity measurements up to 17 GPa at room temperature. Contrary to previous experiment, using helium as a pressure transmission medium, no structural transformation was observed in pure Mg2Si. In contrast, a phase transition from cubic anti-fluorite (Fm-3m) to orthorhombic anti-cotunnite (Pnma) was observed in the Al-doped sample at 10 GPa. Infrared reflectivity measurements show the electrical conductivity increases with pressure and is further enhanced after the phase transition. The electron density of states at the Fermi level computed form density functional calculations predict a maximum thermoelectric power factor at 1.9 GPa, which is in good agreement with the experimental observation.
- Authors:
-
[5];
- Univ. of Saskatchewan, Saskatoon, SK (Canada)
- Carnegie Inst. of Washington, Washington, DC (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Okayama Univ. of Science, Okayama (Japan)
- Canadian Light Source, Inc., Saskatoon, SK (Canada)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
- OSTI Identifier:
- 1224008
- Alternate Identifier(s):
- OSTI ID: 1420463
- Grant/Contract Number:
- AC02-06CH11357; FC03 03N00144; AC02-98CH10886
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 118; Journal Issue: 14; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- ENGLISH
- Subject:
- 36 MATERIALS SCIENCE; Thermoelectric effects; Gemstones; Crystal lattices; X-ray diffraction; Doping; Electrical conductivity; Density of states; Density functional theory; Electrical properties and parameters; Phase transitions
Citation Formats
Zhao, Jianbao, Liu, Zhenxian, Gordon, Robert A., Takarabe, Kenichi, Reid, Joel, and Tse, John S. Pressure-induced phase transition and electrical properties of thermoelectric Al-doped Mg2Si. United States: N. p., 2015.
Web. doi:10.1063/1.4933069.
Zhao, Jianbao, Liu, Zhenxian, Gordon, Robert A., Takarabe, Kenichi, Reid, Joel, & Tse, John S. Pressure-induced phase transition and electrical properties of thermoelectric Al-doped Mg2Si. United States. https://doi.org/10.1063/1.4933069
Zhao, Jianbao, Liu, Zhenxian, Gordon, Robert A., Takarabe, Kenichi, Reid, Joel, and Tse, John S. Wed .
"Pressure-induced phase transition and electrical properties of thermoelectric Al-doped Mg2Si". United States. https://doi.org/10.1063/1.4933069. https://www.osti.gov/servlets/purl/1224008.
@article{osti_1224008,
title = {Pressure-induced phase transition and electrical properties of thermoelectric Al-doped Mg2Si},
author = {Zhao, Jianbao and Liu, Zhenxian and Gordon, Robert A. and Takarabe, Kenichi and Reid, Joel and Tse, John S.},
abstractNote = {A recent study has shown the thermoelectric performance of Al-doped Mg2Si materials can be significantly enhanced at moderate pressure. To understand the cause of this phenomenon, we have performed in situ angle dispersive X-ray diffraction and infrared reflectivity measurements up to 17 GPa at room temperature. Contrary to previous experiment, using helium as a pressure transmission medium, no structural transformation was observed in pure Mg2Si. In contrast, a phase transition from cubic anti-fluorite (Fm-3m) to orthorhombic anti-cotunnite (Pnma) was observed in the Al-doped sample at 10 GPa. Infrared reflectivity measurements show the electrical conductivity increases with pressure and is further enhanced after the phase transition. The electron density of states at the Fermi level computed form density functional calculations predict a maximum thermoelectric power factor at 1.9 GPa, which is in good agreement with the experimental observation.},
doi = {10.1063/1.4933069},
journal = {Journal of Applied Physics},
number = 14,
volume = 118,
place = {United States},
year = {Wed Oct 14 00:00:00 EDT 2015},
month = {Wed Oct 14 00:00:00 EDT 2015}
}
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Works referencing / citing this record:
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