Phase Relationship and Ionic Conductivity in Na–SrSiO 3 Ionic Conductor
Abstract
The Na–SrSiO 3 as a potential high‐conductivity ionic conductor for intermediate temperature solid oxide electrochemical cells (SOECs) has drawn much attention recently. Some of these studies questioned the feasibility of Na doping and therefore the creation of oxygen vacancies, while others suggested an alternative phase responsible for the ionic conduction. In this study, a systematic investigation was carried out to understand the ionic conduction in Na–SrSiO 3 . Through in situ high‐temperature X‐ray diffraction, thermal analysis, microstructural characterization, and electrical conductivity measurement, Na–SrSiO 3 was shown as a two‐phase material, one being slightly Na‐doped SrSiO 3 and another being amorphous Na 2 Si 2 O 5 . The former was an electrical insulator whereas the latter was a good ionic conductor. It was also found that the amorphous Na 2 Si 2 O 5 phase was unstable at the temperature ≥500°C, crystallizing into the insulating polycrystalline Na 2 Si 2 O 5 which causes conductivity to “bend‐over” at higher temperatures. A preliminary Ab Initio Molecular Dynamics ( AIMD ) simulation suggested that the amorphous Na 2 Si 2 O 5 be predominantly a Na + conductor.
- Authors:
-
- Department of Mechanical Engineering University of South Carolina Columbia South Carolina 29201
- Texas Materials Institute The University of Texas at Austin Austin Texas 78713
- Department of Mechanical Engineering University of South Carolina Columbia South Carolina 29201, Department of Physics Jiangxi Normal University Nanchang Jiangxi 330022 China
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1401398
- Grant/Contract Number:
- DE‐AR0000492
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Journal of the American Ceramic Society
- Additional Journal Information:
- Journal Name: Journal of the American Ceramic Society Journal Volume: 99 Journal Issue: 1; Journal ID: ISSN 0002-7820
- Publisher:
- Wiley-Blackwell
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Jee, Youngseok, Zhao, Xuan, Lei, Xueling, Huang, Kevin, and Koc, ed., R. Phase Relationship and Ionic Conductivity in Na–SrSiO 3 Ionic Conductor. United States: N. p., 2015.
Web. doi:10.1111/jace.13925.
Jee, Youngseok, Zhao, Xuan, Lei, Xueling, Huang, Kevin, & Koc, ed., R. Phase Relationship and Ionic Conductivity in Na–SrSiO 3 Ionic Conductor. United States. https://doi.org/10.1111/jace.13925
Jee, Youngseok, Zhao, Xuan, Lei, Xueling, Huang, Kevin, and Koc, ed., R. Thu .
"Phase Relationship and Ionic Conductivity in Na–SrSiO 3 Ionic Conductor". United States. https://doi.org/10.1111/jace.13925.
@article{osti_1401398,
title = {Phase Relationship and Ionic Conductivity in Na–SrSiO 3 Ionic Conductor},
author = {Jee, Youngseok and Zhao, Xuan and Lei, Xueling and Huang, Kevin and Koc, ed., R.},
abstractNote = {The Na–SrSiO 3 as a potential high‐conductivity ionic conductor for intermediate temperature solid oxide electrochemical cells (SOECs) has drawn much attention recently. Some of these studies questioned the feasibility of Na doping and therefore the creation of oxygen vacancies, while others suggested an alternative phase responsible for the ionic conduction. In this study, a systematic investigation was carried out to understand the ionic conduction in Na–SrSiO 3 . Through in situ high‐temperature X‐ray diffraction, thermal analysis, microstructural characterization, and electrical conductivity measurement, Na–SrSiO 3 was shown as a two‐phase material, one being slightly Na‐doped SrSiO 3 and another being amorphous Na 2 Si 2 O 5 . The former was an electrical insulator whereas the latter was a good ionic conductor. It was also found that the amorphous Na 2 Si 2 O 5 phase was unstable at the temperature ≥500°C, crystallizing into the insulating polycrystalline Na 2 Si 2 O 5 which causes conductivity to “bend‐over” at higher temperatures. A preliminary Ab Initio Molecular Dynamics ( AIMD ) simulation suggested that the amorphous Na 2 Si 2 O 5 be predominantly a Na + conductor.},
doi = {10.1111/jace.13925},
journal = {Journal of the American Ceramic Society},
number = 1,
volume = 99,
place = {United States},
year = {Thu Sep 24 00:00:00 EDT 2015},
month = {Thu Sep 24 00:00:00 EDT 2015}
}
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